Au 2012 Neeser Ab Weed Survey

7/22/2019 Au 2012 Neeser Ab Weed Survey

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Alberta Weed Survey:2009-2010

Irrigated and Dryland Fields

Agriculture and Agriculture etAgri-Food Canada Agroalimentaire Canada

Julia Leeson & Chris Neeser


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Content

Overall weed abundance

Trends

Distribution maps

Results from weed managementquestionnaire


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Background

1stWeed Survey 1930-1931

Series of partial surveys 60s and 70s

Intensive survey Fort Vermillion in 1985(model for future surveys)

1stProvince-wide survey 1997 (684

fields)

2001 survey 1153 fields surveyed


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What we did in 2009

Irrigated Fields (12 districts)

Surveyed 571 fields out 600 target

Distributed 600 questionnaires, 239were returned (38%)


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What we did in 2010

Surveyed 959 dryland fields (target1200)

Covering 88 ecodistricts Mailed out 950 questionnaires, of which

235 were returned (25%)


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Weed Survey Protocol

100 paces

100

paces

5

1 10

15

20

20 paces between

samples

Field corner or

other convenientstarting point


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Data Analysis

Relative Abundance = Relative Frequency+ Relative Uniformity+ Relative Density

countweedTotal

speciesweedbyCountFrequencyRelative =

quadratsofnumberTotal

speciesweedgivenawithquadratsofCountUniformityRelative =

countweedTotal

speciesweedgivenaofCountDensityRelative =


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Irrigation Districts

Irrigation District:

Western

EasternBow River

Lethbridge NorthernSt. Mary River

Taber

RaymondMagrath

UnitedMountain View

Leavitt

Aetna

Ross Creek

Calgary

Brooks

Medicine Hat

Lethbridge

Glenwood

Irrigation District:

Western

EasternBow River

Lethbridge NorthernSt. Mary River

Taber

RaymondMagrath

UnitedMountain View

Leavitt

Aetna

Ross Creek

Calgary

Brooks

Medicine Hat

Lethbridge

Glenwood


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Top 20 Species in Irrigated Broad-leaved crops (beans, potatoes, sugar beets, canola)


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Top 20 Species in Irrigated Annual Cereal Crops (includes corn)


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Top 20 Species in Irrigated Perennial Crops (alfalfa, grass hay)


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Total Weed Density by Crop


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Top 20 Species in All Dryland Crops (2010)


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Top 20 Species in Dryland Cereal Crops (2010)


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Top 20 Species in Dryland Peas and Canola (2010)


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Top 20 Species in Perennial Crops (2010)


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Since the 70s


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Since the 70s


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Since the 70s


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Since the 70s


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Maps


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Wild Buckwheat

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10

Legend(Relative Abundance)

2001 2010


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Wild Oat

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001 2010


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Dandelion

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001 2010


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Canada Thistle

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001 2010


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Cleavers

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001 2010


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Annual Sow Thistle

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001 2010


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Narrow-leaved Hawks-beard

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001 2010


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Kochia

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001 2010


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Canada Fleabane (Conyza canadensis)

Not included

absent

0.1 to 1

1.1 to 4

4.1 to 10

> 10


2001


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The Questionnaire

33 questions specific to the surveyed field

weed management

insect and disease management

tillage, seeding, soil fertility, yield and rotations

18 questions about the farm operation

Overall weed management herbicide resistance

Sprayer calibration


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Herbicide Use: % untreated


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Herbicide Use: Barley

* includes all Monsantoglyphosate products


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Herbicide Use: Wheat


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Herbicide Use: Canola


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Herbicide Groups: 2010 Barley(56 fields)


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Herbicide Groups: 2010 Wheat (92 fields)


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Herbicide Groups: 2010 Canola(61 fields)


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Crop Rotations (2007-2010)


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Herbicide Resistance

Suspected species Nb of fields Herbicide Groups

Wild Oats 34 1, 2,

Kochia 12 2, 4

Wild buckwheat 4 2

Chickweed 2 2, 4

Cleavers 1 2

17 % of respondents suspected herbicide resistance.


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Herbicide Resistance

Confirmed species Nb of fields Herbicide Groups

Wild Oats 11 1, 2,

Kochia 4 2

Chickweed 2 2

Hemp-nettle 1 2

5 % of respondents had confirmed herbicide resistance.


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Key Conclusions

Generally good weed control in high valuecash crops (potatoes, beans, sugar beets,canola).

Weed control is better than in the 70s and80s

Annual sow thistle, narrow-leaved hawks-beard, and Canada fleabane continue to

spread

Herbicide resistance is a significant problemin spite of herbicide rotations


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Acknowledgements Julia Leeson and students at AAFC in Saskatoon

Nicole Kimmel and Cindy Samborsky from the PestSurveillance Branch

Maureen Vadnais from Ag Service Board

Agricultural fieldmen

Agricultural Research and Extension Council ofAlberta (BRRG, CARA & SARA)

Number of Crop Consultants Participating Farmers


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Chris Neeser403 [email protected]

Julia Leeson306-956-7270

[email protected]

Agriculture and Agriculture etAgri-Food Canada Agroalimentaire Canada


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Herbicide Timing


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Number of Herbicide Applications


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Ratings of Weed Management Practices


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Sources of Weed Management Advice


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Objectives

To quantify weed populations in terms oftheir diversity and density of the principal

annual crops grown in Alberta, either with orwithout irrigation.

To document the agronomic and weedcontrol practices used on surveyed fields

To examine correlations between weedmanagement practices and weed populations.

Au 2012 Neeser Ab Weed Survey

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