Report Strawberry Cultivation Plan

8/10/2019 Report Strawberry Cultivation Plan

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Sustainable cultivation planning

- strawberries -

Provided by:

Coordinator:


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Sustainable cultivation planning

- strawberries -

Provided by:

Coordinator:

Adviser:

Module: Sustainable cultivation planning

01.November.2012

Den Bosch, The Nederlands


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I | P a g e

ContentsList of Figures .......................................................................................................................................................III

List of Tables ....................................................................................................................................................... IVChapter 1 Introduction .........................................................................................................................................1

Chapter 2 Experiment design ...............................................................................................................................2

2.1. Research question .....................................................................................................................................2

2.2. Response variables ....................................................................................................................................2

2.3. Treatment variables ..................................................................................................................................2

2.4. Number of repetitions ...............................................................................................................................2

2.5. Field design ................................................................................................................................................2

Chapter 3 Choice of starting material ..................................................................................................................3

3.1. Variety .......................................................................................................................................................3

3.2. Cultivation medium ...................................................................................................................................4

3.3. Starting material ........................................................................................................................................5

Chapter 4 Wattering plan .....................................................................................................................................5

4.1. Level control ..............................................................................................................................................6

4.2. Quality of water .........................................................................................................................................6

4.3. Watering method ......................................................................................................................................6

Chapter 5 Fertilization plan ...............................................................................................................................7

5.1. Fertilization method .............................................................................................................................7

5.2. Circulation system nutrient solution ....................................................................................................7

5.3. Standard nutrient solution ...................................................................................................................7

5.4. Nutrient solution to be prepared .........................................................................................................7

5.5. Fertilizer programme ............................................................................................................................9

5.6. Total fertilizer use .................................................................................................................................9

5.7. Laws or regulations............................................................................................................................ 10

Chapter 6 limate and lighting setpoints....................................................................................................... 11

6.1. Light ........................................................................................................................................................ 11

6.2. Temperature ........................................................................................................................................... 11

6.3. Relative Humidity ................................................................................................................................... 12

Chapter 7 Crop protection plan ..................................................................................................................... 12

7.1. Prevention .............................................................................................................................................. 12

7.2. Plan of approach: .................................................................................................................................... 13


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7.2.1. Pests................................................................................................................................................. 13

7.2.1. Insects and mites ............................................................................................................................. 13

7.2.2. Fungal diseases ................................................................................................................................ 18

7.2.3. Slime moulds ................................................................................................................................... 20

7.2.4. Root and crown diseases ................................................................................................................. 21

7.2.5. Nematodes ...................................................................................................................................... 22

7.2.6. Fruit diseases ................................................................................................................................... 23

Chapter 8 Pollination ......................................................................................................................................... 24

References ......................................................................................................................................................... 25

Appendix A Fertilization advice..................................................................................................................... 26

Appendix B Water analysis ........................................................................................................................... 27

Appendix C Calculation ................................................................................................................................. 29

Appendix D Fertilizer stock at school greenhouse ........................................................................................ 30

Appendix E Assignment: Inspection demands starting material .................................................................. 31


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List of FiguresFigure 2-1: The field design ..................................................................................................................................3

Figure 3-1: Supplied substrate from BVB used in the project ..............................................................................4

Figure 3-2: Soil characteristics ..............................................................................................................................4

Figure 5-1: Diagram of the nutrient solution in a closed cultivation system of the HAS greenhouse .................7

Figure 7-1:Acythosiphon pisum........................................................................................................................ 14Figure 7-2: Thysanoptera pteron....................................................................................................................... 15

Figure 7-3: Fruit damages caused by Thysanoptera pteron.............................................................................. 15

Figure 7-4: Tetranychus urticaeand their eggs ................................................................................................. 17

Figure 7-5: Trialeurodes vaporariorum.............................................................................................................. 18

Figure 7-6: Powderly mildew damages ............................................................................................................. 19

Figure 7-7: Leaf spots ........................................................................................................................................ 19

Figure 7-8: Slim mould ....................................................................................................................................... 20

Figure 7-9: Red stele damages .......................................................................................................................... 21

Figure 7-10: Black root disease damages .......................................................................................................... 22

Figure 7-11: Field damaged by nematodes ....................................................................................................... 22

Figure 7-12: Botrytis fruit damages ................................................................................................................... 23

Figure 8-1: Wireless bumblebee hive ................................................................................................................ 24
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List of TablesTable 3-1: Planting dates ......................................................................................................................................5

Table 3-2: The process of plant propagation for the project ...............................................................................5

Table 4-1: Nutrients mixture of macro elements based on standard level recommended for strawberry.........8

Table 4-2: Standard spore elements recommended. ...........................................................................................8

Table 4-3: Calculation of the quantity needed to be prepared. ...........................................................................9Table 4-4: List of fertilizers and amounts to be used in Tank A. ..........................................................................9

Table 4-5: List of fertilizers and amounts to be used in Tank B. ....................................................................... 10


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Chapter 1Introduction

This report is a Cultivation plan for a Cultivation project performed by the 2nd

year students of Horticulture

and Business Management in HAS Den Bosch University during one of the modules called Sustainable

Cultivation Planning. One of the main aims of this report is to be able to set up and carry out a Cultivation

plan for a certain crop for the following 30 weeks.

For the 2ndyear cultivation project it was decided to grow strawberries as a main crop. The variety AVA was

chosen. With collaboration of Klaas de Jager, innovation manager of soft fruits in The Greenery, the

innovative experiment was created as a continuation based on the last year students results. It was

recommended to use some other light treatment, differ from what was used, and try different plant age. As

far as last year it was not achievable to keep plants flowering during winter, now it is sort of second chance

to try planting with different dates and with the use of other light treatment in a way to prevent

strawberries from going into dormancy. That is the idea of the experiment.

In order to make sure it is possible, it is important to draw up a fertilization, watering, crop protection plans,

to think about quality of starting material and formulate the main questions on the experiment.

In Chapter 2 the experimental design idea is represented. The research questions are set up over there.

The idea is to try to grow strawberries before Christmas and the period before June. If it is possible, then it

can be a great possibility for growers to have their first harvest period much earlier than usually. It is

suggested that with AVA it is most achievable. In Chapter 3 it is explained more detailed why that variety

was chosen and which quality it is going to be.

Which water should be used? How often it should be applied? What is the amount required for plants? All

these and other questions are going to be answered in Chapter 4Watering plan.

It is also very important to know how much the plant needs to be fertilized in order to grow properly. In

Chapter 5 the description of fertilization methods can be found. It is shown how the nutrient solution can be

calculated based on the standard nutrient solution for a certain crop. In this case, for strawberry plants.

As it was mentioned already, that is an experiment which is going to take place in HAS Den Bosch

greenhouse, which is slightly different from the last year experiments results. Therefore, some set points for

light and temperature treatment were made. For how many hours and at what period of the day it should be

applied? The answers can be found in the Chapter 6 of this report.

Later on, the crop protection plan is described in Chapter 7 where the way of prevention some of the

diseases are shown. The biological control and chemical control of many diseases, viruses and fungi which

may appear during 30weeks experiment are suggested. The pollination by bumble bees, which will take

place with strawberry plants, is explained over there.


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Chapter 2Experiment design

In order to make possible an accurate analysis of the cultivation project, a statistical analysis is needed.

2.1.Research question

Main question:

Do light or planting times prevent dormancy of strawberries?

Sub questions:

1. Do different planting times result in different yields and earlier production?

2. What is the effect of different light treatment on yield and earlier production?

3. Is there interaction between planting time and light treatment on yield and earlier production?

2.2.Response variables

Number of days from planting to the first red strawberry per plant.

Weight of harvested strawberries per plant.

2.3.Treatment variables

Light:

normal light with a extra light from sodium lamps

additional led light in blue and red

Three different planting times:

1. First planting time: 20th of November

2. Second planting time: 30th of November

3. Third planting time: 10th of December

2.4.Number of repetitions

There are 210 pots with two plants each, so in total there are 420 plants. There are 2 different light

treatments, so 210 (plant) repetitions per treatment and 3 variations in planting time. In total there are 2

light treatments 3 planting times = 6 variations, then 7 repetitions/planting variation/row/light treatment

5 rows = 35 repetitions/planting variation/light treatment.

2.5.Field design

The experimental field design is set out as shown in Figure 2-1.


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Figure 2-1: The field design

Chapter 3Choice of starting material

3.1.Variety

For the coming Cultivation project only one crop was chosen for the experimentFragaria ananassa

(strawberry). The AVA variety will be used on substrate. AVA is a day neutral variety, which means it maygive continues flowering for continues production.

Flower initiation occurs the same period when plants are in their vegetative stage. In comparison with short

day cultivars, they do not need short day length and low temperatures to initiate flower. (Appendix E) That is

the reason AVA variety will be used, so it is going to be checked if it is possible to prevent dormancy and

harvest them as early as it can be possible.

The AVA strawberries variety which will be used in the project is propagated by Anthe BV. The mother plants

for this propagation are coming from Plantenkwekerij Van den Elzen, certified as EE plants according to NAK-

T Elite certification. (Anonymous, Van den Elzen, 2010) The inspections are made by Naktuinbouw.


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3.2.Cultivation medium

The compartment which will be used for the main cultivation project itself is 12m x 6m and contains 5 rows

with pots in it. There are 210 pots with two plants each. There will be 420 plants overall.

For the cultivation medium peat substrate is used. The peat substrate is supplied by BVB Substrates and the

type C2 coarse is used(Figure: 3-1). This type has high air-filled porosity (AFP). The expected drainage of

the water is to be about 20%. Last year 2ndyear students used the same substrate in the greenhouse at theHAS Den Bosch for their strawberry experiment. It is a mixture of decomposed raised bog peat with addition

of additives (BVB Substrates, n.d.).

Figure 3-1: Supplied substrate from BVB used in the project

According to the package, the pH level varies from 3,5 - 6,5 according to H2O (Figure: 3-2). It means nothing

is needed to be added to rise (or low) pH level because the appropriate level for cultivating strawberries is

5,3-6,7, so it is suitable. Moreover, the pH of the rain water which will be used for irrigation will be checked

for the pH level at 5,5 automatically in the system.

Figure 3-2: Soil characteristics


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3.3.Starting material

In comparison with the last year project, it is planned to plant strawberries much later. It was 10th

of October

last year. The purpose was to achieve production of volume in early March and carry through the production

of volume until June. As a result, it was not possible because plants went in dormancy even with the help of

using light treatment. This year it was suggested to plant strawberries much later and with the 14days (two

weeks) difference for each planting time (Table 3-1).

Table 3-1: Planting dates

Planting

Month Date Plant age

November 6 73 days

November 20 73 days

December 4 73 days

December 18 Plants Gerard Joosten

All the plants used are 73days age. Alongside with the project in HAS Den Bosch greenhouse, Gerard Joosten,

the strawberries grower, will plant the other ones 18th

of December as an addition to our experiment. There

will be the same treatment applied in order to find out if the different planting date leads plant not to go to

dormancy at that time.

At the beginning the motherplants, which were certified as EE plants were planting at 15thof May. By the

10th

of august the new propagated plants were taken out and 1 month later they were stored by the

temperature 3,7C (Table 3-2).

Table 3-2: The process of plant propagation for the project

Schedule Propagation AVA

Action Month Day Plant age

Planting motherplants May 15Planting cutlings on plugs August 10

Plugs in cold storage September 10 31 days

Plugs on trays September 25

Plugs on trays October 9

Plugs on trays October 23

Chapter 4Wattering plan

The present watering plan is used to control the water supply of sustainable cultivation project conducted. It

has to provide enough water effectively and save the water. Moreover, have a good watering plan is one of

the most essential factor leading to the process of cultivation success which significantly reduce the water

problems during the cultivation.

In this chapter will be give the detailed plan of water using and water quality control.


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4.1.Level control

Drainage water management is normally concerned with reducing the amount of drainage water and with

managing its disposal. The drainage water generated must then be managed for reuse purposes in

greenhouses. However, in school`s watering system, the water given to plants is recirculated and recycled.

4.2.Quality of water

For any plant, the selection of water is very important. Different water contains several elements and

nutrient. Such as rain water and tap water. They influence the EC and are able to cause toxicity symptoms.

The amount of water given to depends on greenhouse temperature, sunlight and the pH of soil.

In this project, rain water will be used to be the irrigation water. According to the cultivation plan, the PH of

water has to be controlled between PH 5.7 - 6.4. This will be measure every week after starting the project.

4.3.Watering method

Strawberries prefer plenty of water but it is easy to get diseases if the leaves are wetted. Therefore, we

choose the drip irrigation which is more effective, time-saving, accurate, and it can prevent the leaves from

getting wet.

The water will be added as follows:

Start at + 2.0 hours after sunrise until - 2.0 hours before sunset

Maximum waiting time 3:30 hours

Setpoint light for watering start 250 J/cm2

Amount of water per drip set at 100 ml per dripper

Setpoint pH: 5.5

Setpoint EC: 1.5

At planting the students have to make sure that pots are wet (heavy watered before or direct after planting).

This can be done most efficiently by dripping every 20 minutes with 50 - 70 ml water per dripper or by

showering the pots manually. 20%-30% of water drainage after watering is considered as a successful

irrigation. (Klaas, 2012)

There are 210 pots cultivated, and watering 100ml per time per pot. Therefore is given 21 liters in total for

each time the irrigation is done. Thus the amount of water per day on a cloudy day can be 42 liters and 147-

168 liters on a sunny day.


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Chapter 5 Fertilization planFor every crop grown in a greenhouse the feeding process is an artificial one, done by means of machinery

and set up by human. Therefore is a crucial factor in the future growth, development and crop yield to have

a proper fertilization plan.

5.1. Fertilization methodThe fertilization is made by use of drip feeder. One drip feeder will be place per pot. The irrigation watercontains fertilizers, so fertilizer is fed to the plants every time the crop is irrigated. A specification of the

fertilizers can be found in Subchapter5.3 Standard nutrient solution.

5.2. Circulation system nutrient solution

In the school greenhouse a closed circulation system is used, as shown in Figure 5-1. This means that all the

water in the system is recirculated. The drain water, which still contains some nutrients, is disinfected and

mixed with the rain water. The diluted drain solution is the mixed with the fertilizer in the A/B tank and this

gives the drip solution. The drip solution should have the right EC and pH for the crop.

Figure 5-1: Diagram of the nutrient solution in a closed cultivation system of the HAS greenhouse

5.3. Standard nutrient solution

The standard nutrient solution was recommended by Klaas de Jager, agronomist R&D soft fruit crops at The

Greenery (Appendix A).

5.4. Nutrient solution to be prepared

A nutrients mixture is created according to the standard nutrient solution. The fertilizer choice is based on:

1) The standard requirements of macro elements of strawberry


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2) The solubility of nutrients mix in the water1

3) The availability stock of fertilizer from the school greenhouse (seeAppendix D).

Table 5-1: Nutrients mixture of macro elements based on standard level recommended for strawberry

NO3-

H2PO4- SO4

2- K

+ Ca

2+ Mg

2+ mmol/L Fertilizer

11.30 1.25 1.47 5.17 3.99 1.17 Standard

7.98 3.99 3.99 Ca(NO3)23.32 3.32 3.32 KNO3

0.30 0.60 0.30 K2SO4

1.17 1.17 1.17 MgSO4

1.25 1.25 1.25 KH2PO4

-11.30 -1.25 -2.94 +5.17 +7.98 +2.34 mEq/L

Sum: -15.49 Sum: +15.49 mEq/L

As a rule of thumb, the EC can be calculated as follows:

According to the analysis of the water sample from the school greenhouse (seeAppendix B), the water

contains little salt (Ca, Mg and HCO3


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Table 5-3: Calculation of the quantity needed to be prepared.

Dilution 1

Stock solution

Dilution 100

Fertilizer

Required

nutrients

mmol/l

water

Molar

mass

mg/mmol

mg/l

water

Density

mg/ml

fertilizer

ml/l

water

kg/1000 l

water

l/1000 l

water

Ca(NO3)251.2%

(liquid)

3.99 320.5 1278.8 1500 0.853 127.9 85.3

KNO3 3.32 101.1 335.7 33.6

K2SO4 0.30 174.3 52.3 5.2

MgSO4.7H2O 1.17 246.5 288.4 28.8

KH2PO4 1.25 136.1 170.1 17.0

Fe DTPA 6.0%(liquid)

0.030 930.8 27.925 1280 0.022 2.7925 2.1816

MnSO4.H2O 0.015 169.0 2.535 0.2535

ZnSO4.7H2O 0.007 287.5 2.013 0.2013

Na2B4O7.10H2O 0.003750 381.2 1.430 0.1430

CuSO4.5H2O 0.000750 249.7 0.187 0.0187

Na2MoO4.2H2O 0.000500 241.9 0.121 0.0121

The details of the calculation can be found inAppendix C.

5.5. Fertilizer programmeThe fertilizer will be given to the crops together with irrigation water by drip feeder. The starting time is two

hours before sunrise and two hours after sunset (see Chapter 4 Wattering Plan).

5.6. Total fertilizer use

Because highly concentrated calcium will react with sulphates and phosphates (Ministry of Agriculture,

Fisheries and Food, n.d.), it will be prepared in tank A (Table 4-4) and the sulphates and phosphates in tank B

(Table 4-5). The iron chelate will also be prepared in tank A to keep it separate from the other trace

elements in tank B, because the trace elements will repress the iron from the chelate, which leads to

precipitation of iron (Berkhout, 2010).

Table 5-4: List of fertilizers and amounts to be used in Tank A.

Tank A

Fertilizer Amount

Calcium nitrate Ca(NO3)251.2% (liquid) 85.3 l

Iron chelate Fe DTPA 6.0% (liquid) 2181.6 ml


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Table 5-5: List of fertilizers and amounts to be used in Tank B.

Tank B

Fertilizer Amount

Potassium nitrate KNO3 33.6 kg

Potassium sulphate K2SO4 5.2 kg

Epsom salt (heptahydrate) MgSO4.7H2O 28.8 kg

Mono potassium phosphate KH2PO4 17.0 kgManganese sulphate MnSO4.H2O 253.5 g

Zinc sulphate ZnSO4.7H2O 201.3 g

Borax Na2B4O7.10H2O 143.0 g

Copper sulphate CuSO4.5H2O 18.7 g

Sodium molybdate Na2MoO4.2H2O 12.1 g

5.7. Laws or regulations

The Dutch laws regarding use of fertilizers in greenhouse became stricter starting the current year (Beerling,

2011) . They are very specific when one speaks about reuse of water, mixing, handling of fertilizers and

storing.

Reuse of water

No discharge below Sodium threshold value

No residual discharge water on sewage system

Obligatory 500 m3/ha rainwater storage

Storing

The fertilizers shall be stored in special places and recipients/tanks from where they cannot leak. The

fertilizers cannot be stored as a mix of nutrients; they must be stored as separate and mixed when

needed. (Anonymous1, 2005)

Handling

All the fertilizers must be handled only by authorized personnel with license. Protecting equipment must

be used when one wants to work with fertilizers. (Anonymous1, 2005)

Mixing

Mixing can be done only according to law which specifies the substances what can me mixed by

authorized personnel. (Anonymous, regelgeving, 2012)


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Chapter 6 limate and lighting setpoints

Climate and lighting are a major factor in present cultivation project. Therefore a great attention will be

given to.

6.1. LightAccording to the main question, which was set up for the coming experiment with strawberries is: Do light

or planting times prevent dormancy of strawberries? It is going to be measured whether different light

treatment effects on yield and earlier production. Different light treatment means the use of Assimilation

lights & LED lights respectively. As it was mentioned, the compartment for the experiment will be divided

into 2 parts where half of plants will be treated with normal light only and the other one with the use of red

light (Figure 2-1, Chapter 2. The field design).

The following setting points will be followed for treatments:

Assimilation lights

Assimilations light should be on up from 8.00 am until 16:00 hours pm (8 hours)

Settings LED lights - day length

LEDs for the day length should be on up from 16:00 hours pm - 8.00 am (16 hours)

6.2.Temperature

In case the experiment is set to see if it is possible to prevent dormancy, then it is very important to create

right temperature which will influence on flowering and fruiting on strawberry plants. The optimal

temperature for flowering is to keep from 17C during 10 hours to maximum 11C during 15 hours. As for

the following experiment it was decided to keep average 24-hours temperature at the point of 14C (taking

in account that the first planting time is at November 6, so the experiment is going into winter). Therefore,

that is the heating pipe temperature suggested:

Max pipe temperature45 degrees day and night

Min pipe temperature30 degrees

period: - 1.00 hours before sunrise until + 4.00 hours after sunrise

Night temperature:

11 degrees setpoint heating

period: - 1 hours before sunset untill - 3.30 hours before sunrise

12 degrees setpoint ventilationperiod: + 2 hours after sunset untill - 3.30 hours before sunrise

Day temperature:

16 degrees setpoint heating

period: - 3.30 hours before sunrise untill -1.00 hours before sunset

17 degrees setpoint ventilation

period: - 3.30 hours before sunrise untill + 2.00 hours after sunset


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6.3.Relative Humidity

When it comes to humidity, there is the same aim as it was described above: to create summer conditions

instead of winter coming. The relatively high humidity is required for strawberries to flower. Consequently, it

was set up as following:

Day humidity70 %

period: - 1.00 hours before sunrise untill - 1.00 hours before sunset

Night humidity85 %

period: - 1.00 hours before sunset untill -1.00 hours before sunrise

(Klaas, 2012)

Chapter 7 Crop protection plan

All the crops are susceptible to different natural stressors, more specifically pests and diseases. For avoiding

problems in their cultivation project, students have to realize a sustainable crop protection plan which will

provide all the information needed regarding prevention and treatment of pests and diseases.

7.1.Prevention

There are many ways in which prevention of diseases may occur and therefore enhances students aim of

crop protection.

Prevention of diseases will occur from the beginning because they will use clean and disease free starting

material. Using only plants that are disease free will also is a method to prevent the crop from diseases.

Throughout the entire cultivation project the greenhouses will monitored to make sure that the area in

which the strawberries are growing in are not tempered with and that there are no external factors that

could damage the strawberry plants.( E.g. Human interference)

Furthermore will be used sticky pads, strips (blue and yellow) to catch the pests and that will be located

within the greenhouse. This will allow monitoring the number and the volume of pests within the

greenhouse before and during the project.

The use of sulphur burners will be used in order to prevent the growth of fungi such as Botrytis. This will also

help prevent other forms of fungus from infecting the crop.

An efficient drainage system is also important because will not allow water logging to occur and that is off

the ground in order to prevent contact with the soil and therefore the prevention of fungus infection.

Further safety measure such as preventing any groups members from travelling in and out of different

apartments to prevent the spread of diseases from other crops.


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Finally the students want to keep the apartment closed in order to prevent anyone or anything else coming

in and infecting the plants.

Method

Sticky traps: Deploy the sticky pads just above the plants on each row, an equal number on each row.

Idea: 5 sticky pads equally distributed on the rows.

7.2.Plan of approach:

The plan of our approach to the crop protection of the students strawberry cultivation is that they will

attempt to protect their crop as biologically but also cultural as possible. They will introduce many predators

and conduct many cultural measures in order to protect the crop with minimum or no use of chemical

protection. Early monitoring and the use of sticky pads can also help in their plan of approach. The aim of theplan approach is that the students would also limit the environmental effects and the risk of resistance as

the crop protection is attempted to be done as biologically as possible. They will pay attention to possible

effects on the environment but also on the risk of resistance.

Effects on the environment with biological control

There will be no effects on the environment with the use of biological control as the biological control will be

deployed in a closed system.

7.2.1.Pests

The main objective is to have complete biological control in crop; therefore, application of pesticides will bedone only when it is really necessary. The students will work with IPM (Integrated Pest Management).

Thereby is wanted to avoid applying insecticides when bees are active, to prevent killing the bees.

Throughout the project will be used the sticky pads, both yellow and blue in order to attract a wider variety

of pests and to monitor the crop. Thereby the students are also going to use a hand lens for scouting the

crop.

Control scheme

The crop will be monitored two times a week for all those diseases. Thereby the students are also going touse a hand lens for scouting the crop. The students will also use sticky pads to monitor the pests in the crop.

The monitoring of the students will be done through random selection from the different rows of strawberry

plants. This will allow them to cover greater area of strawberries and therefore will save time not having to

check all the plants.

E.g random check of 5-10 plants per row.

7.2.1.Insects and mites

Is very likely to occur insects and mites in the greenhouse`s room where the strawberries are cultivated

therefore is given much attention to them.


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7.2.1.1. Aphids (Acythosiphon pisum)

The nymph of this specie looks like the wingless adults but then smaller. The adults are about 2 mm, pale

green or yellowish green in colour and may or may not have wings (Figure: 6-1). The aphid overwinters as

nymphs or adults in strawberry crowns or as black eggs on the older leaves. Several strawberry viruses are

spread by aphids.

Figure 7-1:Acythosiphon pisum

They harm the plant by sucking the sap from it. They have to be controlled in order to lengthen the useful

life of the plants. The aphids are mainly found under the surface of youngest emerging leaves from the

strawberry plant. The AVA strawberry normally does not attract many aphids but is expected to deal with

them during the experiment.

Biological control

When the aphids occur the students will use biological control. There is a number of beneficial and natural

help to control aphids. For example lady beetles, lacewings, syrphid flies and parasitic wasps. The use of lady

beetles will try to control the aphids. They will use lady beetles as their primary source of biological control

mainly because they are the most efficient predator. At the time the aphids are going to fly, the students will

combining the lady beetles with wasp. This is because they lady beetles will not be sufficient enough to catch

the aphids but the wasps are capable of catching the aphids.

In case it will not be sufficient the use chemical control will be needed. They can monitor the efficiency of

the biological control through monitoring the number of aphids that are present in the crop. E.g.: stickypads. Scouting should be performed particularly during the early season. (Anonymous, Bc Ministry of

Agriculture, 2012)

Chemical control

Pesticide which will be use when needed is 25 ml Calypso (thiacloprid) per 100 L water. It is preferable to be

used no more than two times per cultivation period in order to prevent resistance. If is needed, students will

alternate spraying with 50 g Pirimor (pirimicarb) per 100 L water. The safety term is 7 days (from last

application until harvest). (Gewasbescherming Vollegrondsgroenteteelt en Aardbeien, 2012)


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Environmental effects

The chemical Calypso (thiacloprid) possesses consequences to the environment. The chemical would be seen

to affect other insects but also affect insects that live in freshwater. Possess little effect on other forms of

life. E.g: plants and animals.

7.2.1.1. Trips (Thysanoptera pteron)

Western flower trips Frankliniella occidentalis is most likely to appear.

Trips are tiny and yellow-brown insects (Figure 7-2). They are small and 0.5 - 1 mm in length. The younger

trips are shiny yellow and they do not have wings.

They can be found most of the times in flowers, under bracts and petals and under the calyx of fruit. The

trips only damage the strawberry fruit that will become bronzing (Figure 7-3). Adults and larvae feed by

removing sap from punctures they make in the plant tissue. Trips are expected in the beginning of spring in

the AVA variety.

Figure 7-2: Thysanoptera pteron

Figure 7-3: Fruit damages caused by Thysanoptera pteron


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Biological control

The students will use the predatory Amblyseius cucumeris to control the trips. The biological control will

start when there are about 10 trips per flower detected. Is not desired to start too early with this application

to avoid the death of the predators. This is because the Amblyseius cucumeris only kills the first nymphal

instar the students would have to deploy the predators at an early stage in order to make the biological

control efficient. With that in thought they cannot introduce the predators too early because the predators

may die as a result of no pest to eat.

Chemical control

When needed will be used 100 ml Spruzit per 100 L water. The safety term is 2 days (from last application

until harvest). (Gewasbescherming Vollegrondsgroenteteelt en Aardbeien, 2012) If the students do have to

use this chemical control they would also kill off the beneficial insects within the crop. As a result to this the

students would then have to re-introduce the insects later. Furthermore the students will need to apply a

chemical control such as Spruzit when they notice that the numbers of trips within the crop is too large to

control biologically.


Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic

environment. This is only applies if the water leaks out into other sources of water. This would not be highly

considered as the students are conducting their project in a closed environment (glasshouse).

7.2.1.2. Spider mites (Tetranychus urticae)

The spider mite is very tiny and it is hardly possible to see it with the naked eye. The mites lay eggs in spring

and throughout the summer and the eggs look like a small pile of salt. The mites will attack at first the young

folded leaflets in the centre of the plant which results in crinkled or puckered leaves. The older leaves will be

darker green or twisted and feel brittle. (Anonymous, Bc Ministry of Agriculture, 2012)


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Figure 7-4: Tetranychus urticaeand their eggs

Biological control

The biological control use for trips is also efficient for spider mite control. (Gewasbescherming

Vollegrondsgroenteteelt en Aardbeien, 2012) So will be used the Amblyseius cucumeris (200-300 mites per

m2) to control the spider mites. In case of very severe infection the infected plants have to remove. After

this operation will be added 500 Amblyseius cucumeris in the plants around the removed plants. If the

students notice that the Amblyseius cucumeris is not efficient in killing the spider mites they will then

introduce the Phytoseiulus persimilis. We will notice that there are still spider mites on the plants. Using the

Phytoseiulus persimilis as secondary option is good because they are specialised in killing spider mites. On

average a one Phytoseiulus persimilis will kill around 7 spider mites and 20 spider mite eggs per day.(Anonymous, Bc Ministry of Agriculture, 2012)

The students would chose to use the Amblyseius cucumeris because they also kill other different species of

pest and therefore be introduced earlier without the risk of death.

Chemical control

No chemical control possible.

7.2.1.3. White fly (Trialeurodes vaporariorum)The white fly is a tiny insect with yellowish bodies and white wings (Figure 7-5). They usually occur in groups

on the undersides of leaves and suck phloem sap. The leaves can turn yellow or appear dry and they can

cause fall off plants. (Anonymous, How to manage pests, 2011)
http://www.google.nl/imgres?q=spider+mite+strawberry&hl=nl&biw=1280&bih=930&tbm=isch&tbnid=zA54coadlfCmEM:&imgrefurl=http://www.ces.csiro.au/aicn/name_c/a_4116.htm&docid=3U3KIo0RcnjpBM&itg=1&imgurl=http://www.ces.csiro.au/aicn/images/cain516.jpg&w=300&h=350&ei=M1qBUMH0NcHU0QWrooGgBA&zoom=1&iact=hc&vpx=607&vpy=574&dur=2698&hovh=243&hovw=208&tx=135&ty=187&sig=113399130795468381209&page=2&tbnh=143&tbnw=126&start=26&ndsp=31&ved=1t:429,r:13,s:20,i:168http://www.google.nl/imgres?q=spider+mite+strawberry&hl=nl&biw=1280&bih=930&tbm=isch&tbnid=zA54coadlfCmEM:&imgrefurl=http://www.ces.csiro.au/aicn/name_c/a_4116.htm&docid=3U3KIo0RcnjpBM&itg=1&imgurl=http://www.ces.csiro.au/aicn/images/cain516.jpg&w=300&h=350&ei=M1qBUMH0NcHU0QWrooGgBA&zoom=1&iact=hc&vpx=607&vpy=574&dur=2698&hovh=243&hovw=208&tx=135&ty=187&sig=113399130795468381209&page=2&tbnh=143&tbnw=126&start=26&ndsp=31&ved=1t:429,r:13,s:20,i:168


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Biological control

The students do not think white fly will damage the AVA variety in a high level by using the predatory

Amblyseius swirskii. They expect that the AVA variety will not be infested with white fly.

Chemical control

25 ml Calypso (thiacloprid) per 100 L water will be used if chemical control will be needed. (anonymous, n.d.)

Is the same substance which can be used for aphids and it will kill the larvae of the white fly.

Environmental effects:

The chemical Calypso (thiacloprid) possesses consequences to the environment. The chemical would be seen

to affect other insects but also affect insects that live in freshwater. Possess little effect on other forms of

life. E.g.: plants and animals

Rates

SWIRSKI-

MITERate m/unit

interval

(days)frequency remark

preventive 25/m 2000 - 1x -

curative light 50/m 1000 - 1x start when trips or whitefly is present

curative

heavy100/m 500 - 1x

infested areas only, always in

combination with other beneficial

7.2.2.Fungal diseases

Fungal diseases are very likely in strawberries, especially in high relative humidity.

7.2.2.1. Powderly mildew

White patches of mycelium may appear on lower leaf surface and the edges of leafs may be rolled up (Figure7-6). The flowers may end up looking deformed or they may be killed due to the Powderly mildew. Besides

Figure 7-5: Trialeurodes vaporariorum


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the fruits can be infected and may stop ripening. (Anonymous, Strawberry diseases, 2009)

Cultural control

Students want to prevent breeze as much as possible to prevent the fungi (powdery mildew) from occurring.

Chemical control

For chemical control, will be used sulphur burners during stages where the moisture and humidity are at

their highest in order to protect and prevent Powderly mildew.


There will be a small amount of sulphur released into the air. This could then cause acid rain to occur on a

small scale thus causing the soil in the environment to be lowered.

7.2.2.2. Leaf spots

Symptoms are red rusty borders and white centres. The disease may also affect the flower, stem and the

runners. As spots grow bigger they tend to turn into grey colours (Figure 7-7). Free and safe starting material

will be needed to get it out of diseases.

Figure 7-6: Powderly mildew damages

Figure 7-7: Leaf spots


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Chemical control

Only if the leaf spot is severe is needed to apply fungicides. The leaf spot is a clear diagram of severe amount

of leaf spot. The use of propiconazole would be most suitable to as if the leaf spots are detected. The

students will Spray at a concentration of 500ml/ha. This would be a concentration that would be able to

cover a greater surface of the infected leafs. (Anonymous, Strawberry diseases, 2009)

Disease cycle

Diseases survive the winter and new disease cycle begins when rain and wind disperse fungal material.


Due to the approach that the students are taking on crop protection there will be no effects on the

environment as they plan on using clean material and disease free plants in order to prevent leaf spot and

the use of chemical control.

7.2.3.Slime moulds

Due to warm and wet weather, slime moulds usually cover the straw and the lower leafs (Figure 7-8) of the

plant. Normally is seen in low lying plants and occurs weather is warm and wet.

Control

The planting environment must be clean and also the starting material. Avoiding water getting logged

between the plants and trying to keep things as dry as possible is a good way to prevent infection.


There will be no effects visible as no chemical compounds are used to prevent slime moulds.

Figure 7-8: Slim mould


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7.2.4.Root and crown diseases

7.2.4.1. Red Stele

Diseased plants produce fewer runners and smaller berries. Older leafs show browning and death (Figure 7-

9) and new leafs are stunted in hot temperatures and dry periods. (Anonymous, Strawberry diseases, 2009)

Figure 7-9: Red stele damages

Diseases cycle

Red Stele normally occurs in wet, humid conditions at temperatures between 1-10 degrees. Especially in

water logged soil. The disease is very active during spring time and blooming period.

Control

Red stele will be hard to come across as our drainage system will be good and there will not be any waterlogged soil. The students would also prevent Red stele by using disease free soil and starting material.

Red stele is always a possibility despite the cultural control and preventative measures taken into account.

The students will do all they can to prevent the red stele from occurring but bearing in mind that it is more

than capable of appearing in their crop.

7.2.4.2. Black root rot

Symptoms are root attacking fungi which turn the roots black and lose their feeder roots (Figure 7-10). The

cause could be freezing or waterlogged soil or nematodes seen in clay soil and excessive irrigation.

(Anonymous, Bc Ministry of Agriculture, 2012)


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Figure 7-10: Black root disease damages

Chemical control

Soil fumigation may be used in order to reduce or cure the problem.

7.2.5.Nematodes

This are small round worms which cause root knot-signs of nematodes, stunted growth, yellowing of leafs,

reduced yields, less runners and wilting of the plant (Figure 7-11).

Figure 7-11: Field damaged by nematodes

Control

Regular samples should be taken in order to monitor and keep record of the amount of nematodes within

the soil. Fumigation is probably the best method to get rid of the nematodes. Unlikely to occur in the present

project.


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7.2.6.Fruit diseases

7.2.6.1. Botrytis fruit rot (Gray mould)

Symptoms are showed as a grey cover on the fruit surface, it also causes the affected flowers to turn brown

and die. The berry turns brown but stays firm-most frequent during rains.

Caused through contact with soil or contaminated fruits. During spring time the fungus grows down theplant into the young berries and causes infection that may be seen in a later stage of life (Figure 7-12). They

will use the combination of cultural control and chemical control to control the effects of the botrytis fruit

rot on our strawberries. (Anonymous, Bc Ministry of Agriculture, 2012)

Biological control

Clear and destroy old leafs and fruits that may possible contain Botrytis. Control and destroy the weeds

around the plant in order to reduce humidity and moisture surrounding the plant. Manage the spacing

between the rows and the leafs in order to assure that the leafs on the floor dry faster.

Chemical control

The use of a variety of fungicides will be used in order to prevent the fungi from affecting the crop. The use

of sulphur burners are also a commonly way of fungi developments prevention. The fungicides will beapplied through varies periods in which they should apply funcides. For example: During rainy and humid

temperatures and during the peak flowering period. The students will use a variation of fungicides against

botrytis as a result of preventing resistance. In this case the students will vary the use of fungicides in order

to prevent the risk of resistance from occurring.

Effects on the environment

One of the main effects that fungicides bring out to the environment is that they contain metals that

contaminate soils, rivers and underground water.

Figure 7-12: Botrytis fruit damages


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Chapter 8Pollination

The students will use bumble bees in order to carry out the pollination. This is because the bumble bees are

extremely active in pollinating. The other reason to why the students will be using the bumble bees for

pollination is that they have a proven track record with majority of the Dutch famers in the Netherlands.

There are many negatives that come forth due to the use of bumble bees for pollination such as they get

orientated due to the domination of the UV lights. As a result to this they then become less efficient as

pollinators. Bumble bees also suffer when there is failure in their colonies.

Figure 8-1: Wireless bumblebee hive

In order to prevent all this from happens the students could possible use the wireless bee home. The

wireless bee house is capable of closing automatically or manually in order to allow the bees to be released

during favorable light hours, thus making less time consuming. This will therefore enhance their efficiency to

pollinate. Furthermore the wireless bee hive will extend the bumble bees life as they will keep control of

their colonies. Plus bumble bees have difficulties in processing and being orientated when the UV lights are

in place.

The students realized that this method of pollination will increase efficiency of pollination but also improve

the lifespan of the pollinators (Bees). They will place the beehive at around 1.2 meters. The bee hives will be

opened at sunrise and closed at sunset in order to allow the bees to work and pollinate during the light

hours before the use of the UV lights are needed.

This would have a positive effect on the bees as they are kept away from the UV lights that could hinder

their orientation and thus making pollination less efficient. Therefore having more control on the pollination

of the bees but at the same time keeping them safe and away from the UV lights (anonymous, n.d.).


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ReferencesAnonymous. (2012). Bc Ministry of Agriculture. Retrieved April 23, 2012, from Strawberries.

Anonymous. (2011, February). How to manage pests. Retrieved June 8, 2012

Anonymous. (2012). regelgeving. Retrieved October 19, 2012, from minerale meststoffen federatie web site:

http://mineralemeststoffen.brabers.nl/Regelgeving/Regels-voor-het-mengen-van-meststoffen

Anonymous. (2009). Strawberry diseases. Retrieved March 12, 2009

Anonymous. (2010). Van den Elzen. Retrieved October 14, 2012, from

http://www.vdelzenplanten.nl/en/quality/of-our-plants.

Anonymous1. (2005, November 2005). Regeling van de Minister van Landbouw, Natuur en Voedselkwaliteit.

Retrieved October 19, 2012, from overheid web site:

http://wetten.overheid.nl/BWBR0018989/Opschrift/geldigheidsdatum_20-10-2012

Beerling, E. (2011, October 5). Retrieved October 30, 2012, from Wageningen University Resort website:

http://edepot.wur.nl/177962

Berkhout, B. (2010). Dosing Trace elements.Retrieved October 30, 2012, from Relab den Haan:

http://www.relabdenhaan.com/UserData/Documents/F9D1B6DC67B0404F893F74E922DD5849.pdf

BVB Substrates. (n.d.). Strawberry-substrates.Retrieved October 18, 2012, from BVB Substrates:

http://www.bvb-substrates.nl/dynamic/media/1/files/ProductleafletsEng/Fruits/20409065-

BVB_SUBSTRATES_LR_Strawberry_GB.pdf

CTGB. (2011). Retrieved from College voor de toelating van gewasbeschermingsmiddelen en biociden.

Gewasbescherming Vollegrondsgroenteteelt en Aardbeien.(2012).

Klaas, d. J. (2012, 09). advises of watering plan. (Ho,Cheng, Interviewer)

Koppert. (n.d.). Retrieved October 15, 2012, from Koppert Biological Systems: www.koppert.nl

Ministry of Agriculture, Fisheries and Food. (n.d.). Preparing a Complete Fertilizer Solution.Retrieved

October 30, 2012, from The Province of British Columbia:

http://www.agf.gov.bc.ca/ornamentals/floriculture/prepare.pdf

Pijnenburg, H. (2012). Gewasbeschermingsgids.Wageningen.

substrates, B. (2012). BVB substrates. Grubbenverst, the Netherlands.


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Appendix A Fertilization advice


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Appendix B Water analysis


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Appendix C CalculationCalculation for a liquid fertilizer:

Calculate the molar mass of solid Ca(NO3)2:

This molar mass amounts to of the total molar mass, so the total molar mass is

We need , or

The density of liquid Ca(NO3)2at 25 C is , so we need

The tank has a capacity of and we wil use a concentration of times, so

Calculation for a solid fertilizer:

Calculate the molar mass of MgSO4.7H2O:

We need , or

The tank has a capacity of and we wil use a concentration of times, so

Other fertilizers are calculated in the same way.


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Appendix D Fertilizer stock at school greenhouse

Liquid Solid

1 Ammoniumnitraat 1 Agroblen 18-6-12+3 (3-4M)

2 Calcium chloride 2 Agroblen 19-00-12+4

3 Calcium nitraat 3 Ammonium sulfaat salpeter

4 Librel ijzer chelaat 6 % 4 Ammonium sulfaat zwavel ammoniak

5 Magnitral 5 Bitterzout6 Salacid 6 Borax

7 Dolokal

8 Entec 14-7-17+2+micro

9 Entec 26%N

10 Floranid 15-9-15+2+micro

11 Gekorrelde kalk

12 Ijzer sulfaat

13 Kalisalpeter

14 Kalium chloride oplosbaar kali 60

15 Kalium chloride strooibaar kali 60

16 Kalium sulfaat

17 Kalk salpeter

18 Kalkammon salpeter

19 Kieseriet korrel

20 Koper sulfaat

21 Kristalon 15-5-30+3+micro

22 kristalon 18-18-18+3+micro



25 Lewatitt

26 Magnesamon27 Mangaan sulfaat

28 Mono kalium fosfaat

29 Multigrow 24-6-18

30 N.P.K. 12-10-18

31 Natrium molybdaat

32 Osmocote 15-10-11+3+te Hi end 8-9mnd

33 Osmocote 15-9-12+2,5+micro(5-6M)

34 Osmocote 15-9-9+3+micro (8-9M)

35 osmosol 13-5-25

36 Patent kali

37 Peters 12-00-4338 stikstof magnesia

39 Technische ureum 46%

40 Tripel super fosfaat

41 Zink sulfaat


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Material

Beside the viruses from soil by which plants can be affected, it is also very important for plants be varietaly

true and pure. Due to NAK contributes to high quality products they must be sure about the varieties they

produce. They must be named properly and be not mixed verieties, otherwise there is no guarantee in what

customers are going to use. That is why throughout the year visual inspections are taking place.

Damage

Those plants, which are damaged by droughts, frosts, rain cannot be certified. Certified material must meet

stringent quality requirements. In this case, if plants are damaged they are much lower quality. Moreover, it

means that plants do not resist against environmental factors, which is also not good.

4. Explanation of the purpose of inspection

Xiphinema species & Longidorus species

Plants, affected by these nematodes are showing a poor growth and stunting of the plant, yellowing or

wilting of the foliage, and reduced root systems which can include root necrosis, lack of or secondary roots.

It also causes the devitalization of root tips and overall root death when they feed at the root tips and root

sides of strawberry plants. Both of them are important transmitters of various plant viruses including tomato

ring spot nepovirus (TomRSV), tobacco ring spot nepovirus (TRSV), peach rosette mosaic nepovirus (PRMV),

and cherry rasp leaf nepovirus. (Anonymous, Wikipedia, 2012) + (Trudgill)

As roots play important part in strawberry plant development, it is vital to be sure there are no these

nematodes appear during propagation. As soon as they can transmit viruses from tomatoes, cherries,

peaches, that for sure these crops must not grow in the surrounded area where strawberries are cultivated.

Collectotrichum acutatum

Despite diseases in strawberry crops tend to be more virulent in warm climates, where damage can be

devastating, this virus can occur in cooler conditions where propagating material is grown. (pic.1)

They may lie dormant in the soil for some time, often overwintering. Survival is longest under relatively cool,

dry conditions. (EPPO)Collectotrichum acutatumfrequently colonizes leaves and petioles of runner plants in

the nursery. Symptoms may not be visible in the nursery environment, but if inoculum is allowed to build up

and the weather is favorable, flowers and fruit are attacked and lesions may develop on the petioles (pic.2).

It spreads from colonized tissue above the ground to the root system below. (Peres, 2012)

As it was mentioned roots and tissue can be affected. The dangerious for propagation process can be that

this virus may appear in cold conditions and may be dormant in the soil. As a result not only root system

suffers but it may also affect the runners directly when they appear.

Verticillium dahlia

It is a soil-borne fungi with worldwide distribution, causing vascular disease that results in severe yield and

quality losses in fruit .The control of this fungi is difficult because they can survive in the soil as resting

structures for several years. (Zebrowska J, 2007) Because microsclerotia (so-called) are in the soil, growers

should be reminded that the movement of significant amounts of infested soil (via mud clinging to

equipment and vehicles or by in-field disking) will move the pathogen to uninfested locations. Researchers

also find that microsclerotia can be found in high numbers in old strawberry crop residues. (Koike, 2011)


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As with Collectotrichum acutatum virus, Verticillium dahlia fungi may stay in soil or years and do not be

active towards plants. It also can be found in old strawberry residues, so if propagators do not change fields

they may face up with this fungi being in soil.

Phytophtora cactorium

Initially, symptoms typically include plant stunting and small leaves. It leads to brown discoloration in the

crown vascular tissue or throughout the crown tissue. Phytophthoraalso attack roots, causing a brown to

black root rot. When the soil becomes saturated with water, the pathogen can produce and release

zoospores, which swim through water-filled pores to infect plant tissue. It can also produce resilient spores

(chlamydospores, oospores) that enable them to survive in soil for long periods without a host . Infections

can occur during cool to moderate temperatures, which are typical throughout coastal fruit-production

cycles. (Anonymous, UC IPM Online, 2012)

This fungi is dangerous for strawberry propagation process because of affecting hardly all the species.

Moreover it deals with water where rots are, so it is active when the soil is saturated. It is also possible for

Phytophtoraleave spores which can live on their own and affect roots and tissue independently.

5. Reason

Why the starting material must comply with the inspection demands? Firstly, there is a guarantee the

material has been certified free from viruses and other diseases & pests. Secondly, it offers a grower more

peace of mind that the plant is a guarantee for a good start.

(Picture 1the Collectotrichum acutatumaffection on strawberry fruits)


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(Picture 2the Collectotrichum acutatumaffection on strawberry petioles)

Appendix E References:

Anonymous. (2012). Strawberry plants. org. 2 October 2012 r.,

http://strawberryplants.org/2010/05/strawberry-varieties/.

Anonymous. (16 July 2012 r.). UC IPM Online. 11 October 2012 r.,

http://www.ipm.ucdavis.edu/PMG/r734100911.html.

Anonymous. (3 October 2012 r.). Wikipedia. 17 October 2012 r.,

http://en.wikipedia.org/wiki/Strawberry.

Anonymous. (6 July 2012 r.). Wikipedia. 11 October 2012 r.,

http://en.wikipedia.org/wiki/Xiphinema_americanum.

EPPO, C. a. (..). Collectotrihum acutatum. 11 October 2012 r.,

http://www.eppo.int/QUARANTINE/fungi/Colletotrichum_acutatum/COLLAC_ds.pdf.

Koike, M. B. (9 June 2011 r.). Strawberries & Caneberries. 11 October 2012 r.,

http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5078.

Peres, J. M. (April 2012 r.). University of Florida IFAS Extention. 11 October 2012 r.,

http://edis.ifas.ufl.edu/pp128.

Rieger, M. (2006). Strawberry. M. Rieger, Introduction to Fruit Crops(. 383). the Haworth Press.

Trudgill, D. B. (..). Nematode transmission of plant viruses. 11 October 2012 r.,

http://faculty.ksu.edu.sa/5905/Plant%20Virology/Viral%20transmission%20by%20Nematodes.pdf.

Zebrowska J, H. J. (2007). NCBI. 11 October 2012 r.,

http://www.ncbi.nlm.nih.gov/pubmed/17390855.

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