Sustainable Tomato Disease Management for the SE US
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Dealing with
Tomato Diseases
in the SoutheastDr. Joe Kemble
Extension Vegetable Specialist
Auburn University
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What is a Plant Disease?
Any disturbance of a
plant that interferes
with its normal growth
and development.
Biotic diseases -caused by living
agents (bacteria,
fungi, etc.)
Abiotic diseases -caused by non-living
agents
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Sign vs. Symptom
Disease symptoms are changes in a
plant’s appearance in response to a
pathogen that deviates from its normal
appearance.
Disease signs are structures of the plant
pathogen visible on the infected plant.
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Signs or Symptoms?
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Fusarium wilt - tomato
Signs or Symptoms?
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Disease Triangle
Three factors needed for a biotic plant disease:
1. Susceptible host
2. Plant pathogen
3. Environmental conditions favorable for disease
development
Plant Disease
HOST
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Viruses
500 + cause plant diseases
Submicroscopic organisms usually made
up of RNA and a protein coat
Replicate themselves within the host cells
Require a living host to survive
Infect plants through wounds
Insects, wounds, mechanical damage
Spread by insects, seed, humans
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Bacteria
200+ species cause plant diseases
Cause similar symptoms as fungal
diseases Leaf spots, fruit rots, cankers, vascular wilts and
root rots
Infects plant through wounds & natural
openings
Spores spread by wind, rain, insects
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Fungi Cause over 80% of all plant diseases
Symptoms include
Leaf spots, fruit rots, cankers, vascular wilts
and root rots
Spread by wind, rain, insects, people
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Abiotic Diseases Nutrient
deficiencies/excesses
Moisture
deficiencies/excesses
High or low pH soils
Misapplication
Pesticides, fertilizer
Air pollution
Ozone, PAN (peroxyacl
nitrate)
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Viral Diseases
Common in
Tomatoes
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Plant Viruses Tomato Spotted Wilt virus
Insect transmitted
Not seed-borne
Tobacco Mosaic virus
Can survive on seeds
Can be transmitted
mechanically
Tomato Mosaic virus
Can survive on seeds
Can be transmitted
mechanically
Cucumber Mosaic virus
Insect transmitted
Can survive on seeds
Cucumber Mosaic virus
Symptoms can be similar
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Viruses - Symptoms
Mottled leaves; mosaic
leaf patterns
Distorted leaves
Stunted plants
Can overwinter in weeds
Fruit stunted in size,
mottled and deformed
Reduced marketable
yields especially if
tomato infected early
Tobacco Mosaic virus
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Virus - Management Resistant Varieties – “T” and “Tm”
Don’t plant next to infected
plants, fields
Mulches
Reflective mulches
Row covers
Mature plant resistance
Sanitation
Tools, containers, pots, HT/GH
floor, shoes, remove debris,
remove weeds
Certified, disease-free seeds &
plants
Seed Treatments (bleach, HCL)
Insect control – depends on virusTomato Mosaic virus
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Row Covers −
to exclude insect
early in
production cycle
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Tomato Spotted Wilt Virus Spread by Tobacco and
Western Flower thrips
Infected plants often
stunted, may die
Terminal leaves stop growing; become distorted
& turn pale green
Leaves have purple/bronze
appearance
Speckling & ring spots form
on leaves
Dark streaks develop on petioles and stems
Fruit may have ringspots
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TSWV Management Plant TSWV-Resistant Cultivars
Amelia VR
Belle Rosa
BHN 602, 640
Crista
Mountain Glory
Mountain Majesty (EB,LB)
Mountain Merit (LB)
Primo Red
Red Defender
Roma types: Granadero, Picus, Plum Regal
Reflective Mulches may Reduce Thrips Feeding
Effective Weed Control In & Around Area (esp. HT/GH)
Insecticide Control of thrips – spinosad/Entrust (OMRI)
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Bacterial Diseases
Common in
Tomatoes
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Bacterial Spot
Introduced on
transplants
Attacks leaves & fruit
Favored by warm, wet
weather
Leaf spots can be
irregular, ragged
Fruit spots can be
raised or scabby
Bacterial spot > 80°F
Bacterial speck < 80°F
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Bacterial Spot
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Bacterial SpotBacterial Spot
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Bacterial Spot
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Bacterial Spot Control Use Disease-free Transplants
No resistant tomatoes
Prevent Splashing
Use Drip Irrigation
Mulch around plants
Don’t work w/plants when wet
Sanitation
Treat Seeds (hot water,
bleach, HCL)
Tools, trays, pots, HT/GH floor,
shoes, remove debris, remove
weeds
Crop Protectants
Serenade/Cease (OMRI)
Double Nickel 55 (OMRI)
Copper Fungicide?
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About Seed Treatments… Hot Water Treatment
Can be used on most veggies
Reduces, if not eliminates, seedborne fungi and bacteria
Won’t kill pathogens associated with embryo
Won’t remove viruses from seed surface
115 to 122 F for 10 to 60 min depending on vegetable
Chlorine Bleach Treatment
Can be used on most veggies
Removes bacterial pathogens and some viruses (TMV)
1 qt bleach to 5 qt water for 5 min
Rinse for 5 min in water
Hydrochloric Acid Treatment
Excellent on bacterial diseases (spot, speck, canker) on tomato
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…and Saving Seeds Be Selective
Rouge plants
Test plants if in doubt
Use a Seed Treatment as a Insurance against Problems
Assume there are pathogens in or on seed
Use a Hot Water Treatment
Purchase Treated Seed
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Fungal Diseases
Common in
Tomatoes
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Fungal Diseases in SE US
Early blight
(Late blight)
Fusarium wilt
Southern blight
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EARLY BLIGHT
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Early Blight
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Early Blight Caused by the fungus Alternaria solani
Overwinters in plant debris in soil.
Also can enter field on air currents.
Begins on older leaves as irregular spots that enlarge to
½ inch in diameter
Develop concentric rings and a yellow halo
Plants appear to “fire-up” from their base
Warm, wet weather favor its development
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EARLY BLIGHT
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Reduces Fruit Size & Fruit Quality
Increases Sunscald
50 – 100% Yield Reduction
Early Blight
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Early Blight Control
Resistant/Tolerant Cultivars Mountain Magic
Crop Rotation
Prevent Splashing Use Drip Irrigation
Mulch around plants
Staking
Remove Plant Residue after Harvest
Use Disease-free Transplants
Keep Tomato Plants Healthy & Vigorous
Crop Protectants Copper
Serenade/Cease (OMRI)
Double Nickel 55 (OMRI)
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Late Blight & Buckeye RotLate Blight
Late Blight and Buckeye rot
Buckeye rot
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Late Blight & Buckeye Rot Caused by the fungus Phytophthora infestans, P.
parasitica
Late Blight
Cool, moist conditions
Infects fruit and foliage
Look like “hot grease
poured onto plants
Buckeye Rot
Only fruit infected
Soil contact, splashing
75 to 85°F, moist conditions
Late blight sporangia
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Late Blight Control Use Resistance Tomatoes
Mountain Magic, Mountain Merit,
Defiant PHR, Plum Regal
Crop Rotation
Especially from Solanaceous
crops and weed
Prevent Splashing
Use Drip Irrigation
Mulch around plants
Staking
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Late Blight Control Sanitation –
Remove Tomato Residue after
Harvest
Use Disease-free Transplants
Keep Tomato Plants Healthy &
Vigorous
Crop Protectants Copper
Serenade/Cease (OMRI)
Double Nickel 55 (OMRI)
Ballad Plus/Sonata (OMRI)
Mycostop (OMRI) suppression ONLY
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Fusarium Wilt Soil-borne Fungus that
Invades Roots
Survives in Soil for Years
Plugs-up Water conducting Vessels
Causes Yellowing & Wilting of Leaves
Whole Plant Eventually Wilts/Dies
Can Infect Many Vegetables
Tomato, English peas, Watermelons, Irish potato, Pepper
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Fusarium Wilt
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Fusarium wilt on Watermelon
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Fusarium Wilt Control Use Fusarium wilt
Resistant Cultivars VFNT
3 races in the southeastern US
Well Drained Soil
Crop Rotation 3 or 4 year rotation
Solarization?
Use Grafted Plants!!! Heirloom Cultivars on
Resistant Rootstock
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Southern Blight Caused by the fungus
Sclerotium rolfsii
Soil-borne, destructive, often sporadic
Favored by high temps 86-95 F & high moisture
Survives in soil for Years
Can be spread by surface water & movement of soil on equipment
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Southern Blight Rapid wilting of entire plant
White mold (mycelium) covers
lower stem near ground line &
surrounding soil
Small, round structures about
1/16” in diameter, called sclerotia,
form on the mycelium.
Sclerotia are first white, later
brownish, tan
Control Options
Crop rotation, burying sclerotia
Contans WS (OMRI)
Grafting?
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Timber Rot Also called Sclerotinia rot
Occurs during cooler weather compared to Southern blight
Potential problem in high tunnel production and greenhouses?
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Timber Rot
Control Measures
same as for
Southern Blight
Contans WS (OMRI)
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Plant-Parasitic
Nematodes
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Plant Parasitic Nematodes Microscopic wormlike animals
Less than 1 mm in length
Most plant parasitic nematodes live
in soil
Damage plants by feeding on roots
in large numbers, impairing roots
ability to take up water & nutrients
Can’t see the nematodes w/ naked
eye, only the resulting symptoms
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Symptoms Stunting
Leaf yellowing
Loss of plant vigor and/or
overall health
Reduced yields
Wilting (when soil is wet)
Non-uniform distribution of
symptomatic plants in
garden
Symptoms more
pronounced when plant
under stress from other
factors
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Root-knot nematode
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RKN galls on Tomato root
• Causes distinct swellings or galls on roots
• Galls range from pea sized to 1” in diameter
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Root-Knot Nematode Management Wide host range; over
2,000 plants
Management requires
long term planning
Site Selection & nematode
inspection in fall
Sanitation
Crop rotation
Resistant cultivars
Reduce plant stress
Organic amendments
Suppressive crops
Soil solarization
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Abiotic Disorders
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Nitrogen Deficiency Nitrogen is Mobile
Symptoms progress from the OLDER
leaves to YOUNGER
leaves.
Symptoms
Yellowing of the
OLDER leaves
Plants become leggy,
stretch
Plants smaller in size
Yellowing progresses
into necrosis
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Nitrogen Deficiency
Purpling develops on undersides of young leaves
when severe.
Double-check Your Fertilizer Program
Foliar Sprays DO NOT WORK FOR N
Apply to soil
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Blossom-end Rot
Calcium is Semi-Mobile
Interrupt Calcium Availability
Die-back at growing points
Blossom-end of fruit &
vegetable buds
Brown leathery, sunken tissue
at flower end.
Rot organisms & insects can
get in
Calcium Availability
Soil Moisture
Soil pH
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Blossom-end Rot Treatment Prevention is the Key
Soil Test
Apply Lime to pH 6 to 6.5
(dolomitic)
Apply calcium (well in
advance)
Moderate Soil Moisture
Never too wet, never too dry
Use a mulch
Don’t cultivate too deeply
Foliar Calcium Sprays do not
work – try a drench
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ROUND-UP INJURY
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Problem?How to Submit a Sample to
the Plant Disease Clinic
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What Do You Do When You Have a Problem?
Proper and Timely ID is Critical
Contact Your Local Cooperative Extension Office
Go to http://www.aces.edu
Follow the link for County Offices or Diagnostic Labs
Online Resources – publications, handbooks, fact
sheets, etc.
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Field Diagnosis
Look for various stages of symptom development?
Look for distinguishing field patterns:
Row patterns?
Scattered plants?
Groups of plants?
Field margins?
Most of garden?
High or low area of field?
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Foliage/Fruit Examination
Spots - shape and distribution?
Yellowing - pattern and distribution?
Mosaic discoloration - old or new growth?
Growth abnormalities?
Leaf burns - spots, marginal?
Insect feeding damage?
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Stem Examination
Fungal structures present ?
External discoloration – cankers?
Internal discoloration – vascular discoloration?
Ooze present or absent – bacteria?
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Root Examination
Remember!
Half the plant is below the ground
Healthy roots are white and fibrous
Discolored roots?
Root galls?
Absence of secondary roots?
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Critical InformationWhen symptoms first developed?
Recent weather conditions (2-3 weeks)?
Pesticide history?
Fertility program?
Soil test results, Soil pH?
Recent cropping history?
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Selecting Samples for
Laboratory Analysis
Need a representative samples showing
range of symptoms (initial to severe)
Rotting samples are WORTHLESS
Include all plants parts (roots)
Include soil from root zone
Include “critical” information and
Observations from Your Examination
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Selected Resources Grafting
http://graftingvegetables.org/
Seed Treatments
http://www.lsuagcenter.com/NR/rdonlyres/26772246-4C4A-
4028-992D-
95BF6DD51C6D/96988/43SeedTreatmentsVegetables2014FI
NAL.pdf
https://www.youtube.com/watch?v=Ie3H_icKWb4
https://www.youtube.com/watch?v=P-HhIcQrFyI
Vegetable Crop Recommendations for SE US
http://www.thepacker.com/sites/produce/files/SEVeg
Guide_2016.pdf
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Selected Resources
Vegetable Crop Recommendations for SE US
Organic and Conventional Recommendations
http://www.thepacker.com/sites/produce/files/SEVeg
Guide_2016.pdf
Production Guides for Tomato
https://store.aces.edu/ItemDetail.aspx?ProductID=138
00
http://extension.uga.edu/publications/files/pdf/B%201
312_5.PDF
https://www.uky.edu/Ag/NewCrops/introsheets/tomat
oes.pdf