disease management in cole crops and crucifer greens€¦ · cole crops and crucifer greens _____...
TRANSCRIPT
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Disease Management in Cole Crops and Crucifer Greens
Mohammad Babadoost
University of Illinois
Email:
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Major Diseases of Cole Crops
and Crucifer Greens_______________________________________
Alternaria Spot (Fungal)
Black Leg (Fungal)
Black Rot (Bacterial)
Club Root (Fungal)
Downy Mildew (Fungal)
Fusarium Yellows (Fungal)
Rhizoctonia Diseases (Fungal)
Sclerotinia Rot (Fungal)
Turnip Mosaic (Viral) Babadoost
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Major Diseases of Cole Crops and
Crucifer Greens__________________________________________
Alternaria Spot (Fungal) –
Alternaria brassicae
Alternaria brassicicola
Babadoost
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Alternaria spot on
leaves of cole cropsBabadoost
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Alternaria Spot of Cole Crops and
Crucifer Greens__________________________________________
Pathogens are seed-borne
Pathogens survive on plant debris
Pathogens survive on winter
Brassicas and crucifer weeds
Babadoost
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Management of Alternaria Spot of
Cole Crops and Crucifer Greens__________________________________________
Plant pathogen-free seed
Crop rotation for 3 years
Bury plant debris
Eliminated volunteers and weeds
Use fungicides (Check Labels)
Chlorothalonil (e.g., Bravo)
Amistar/Quadris, Cabrio
Endura, Maneb, Rovral, Switch Babadoost
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Major Diseases of Cole Crops and
Crucifer Greens________________________________________
Black Leg (Fungal) –
Leptosphaeria maculens
(Phoma maculens)
Babadoost
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Black leg of cole cropsBabadoost
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Black Leg of Cole Crops__________________________________________
Pathogen is seed-borne
Pathogen survives on plant debris
Moisture is favorable for disease
development
Is not a major disease of leafy green
Babadoost
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Management of Black Leg of Cole
Crops__________________________________________
Plant pathogen-free seed
Crop rotation for 3 years
Bury plant debris after harvest
Grow in fields with no black leg history
Use fungicides (Check Labels)
Cabrio
RovralBabadoost
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Major Diseases of Cole Crops and
Crucifer Greens__________________________________________
Black Rot (Bacterial) –
Xanthomonas campestris
pv. campestris
Babadoost
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Black rot of cole crops Babadoost
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Black rot of cole crops Babadoost
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Black Rot of Cole Crops and
Crucifer Greens________________________________________
Pathogen is seed-borne
(Very Important)
Pathogens survive on plant debris
Pathogen spread by splashing
water, insects, and workers
Babadoost
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Management of Black Rot of Cole
Crops and Crucifer Greens__________________________________________
Plant pathogen-free seed
Plant disease-free seedlings
Plant resistant cultivars (cabbage)
Crop rotation is useful
Actigard may suppress disease
development
Babadoost
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Major Diseases of Cole Crops and
Crucifer Greens__________________________________________
Club Root (Fungal) -
Plasmodiophora brassicae
Babadoost
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Club root of cole crops Babadoost
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Club root of cole crops Babadoost
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Club Root of Cole Crops and
Crucifer Greens__________________________________________
Pathogen is a soil-borne organism
Pathogens has several races
A common disease in acidic soils
Infected plants are not killed
Soil moisture favors disease
development
Babadoost
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Management of Club Root of Cole
Crops and Crucifer Greens__________________________________________
Grow resistant cultivars (cabbage),
when available
Increase soil pH to 7.3-7.5 by liming
Crop rotation of 3 year
Avoid poorly drained soil
Fungicide [e.g., Terraclor (PCNB)] may
suppress disease development Babadoost
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Major Diseases of Cole Crops and
Crucifer Greens_________________________________________
Downy Mildew (Fungal) -
Peronospora parasitica
Babadoost
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Downy
mildew of
cole cropsBabadoost
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Downy Mildew of Cole Crops and
Crucifer Greens__________________________________________
Pathogen survives in winter crops,
also in biennial crops
Pathogen produces oospore
Cole and moist conditions favor
disease development
Spores spread by wind in long
distanceBabadoost
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Management of Downy Mildew of
Cole Crops and Crucifer Greens__________________________________________
Grow resistant cultivars (broccoli)
Minimize moisture in the canopy
Fungicide application
Chlorothalonil (e.g., Bravo)
Phosphorous acid fungicides (e.g.,
ProPhyt, Agri-Fos, Phostrol)
Revus
Quadris, Amistar, Cabrio Babadoost
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Major Diseases of Cole Crops and
Crucifer Greens_________________________________________
Fusarium Yellows (Fungal) -
Fusarium oxysporum
f.sp. conglutinans
Babadoost
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Fusarium
yellows of
cole cropsBabadoost
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Fusarium Yellows of Cole Crops
and Crucifer Greens__________________________________________
Pathogen is a soil-borne fungus
Pathogen spread by soil, water, and
farm machinery
Babadoost
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Management of Fusarium Yellows
of Cole Crops and Crucifer Greens__________________________________________
Grow resistant cultivars
Long-term crop rotation
Babadoost
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Major Diseases of Cole Crops and
Crucifer Greens__________________________________________
Rhizoctonia Diseases (Fungal) -
Rhizoctonia solani
Wire Stem and Bottom Rot
Babadoost
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Wire stem
(Rhizoctonia
infection) of
cole crops
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Rhizoctonia
infection of
cole crops
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Rhizoctonia infection of Cole Crops
and Crucifer Greens__________________________________________
Pathogen survives as sclerotia in soil
and mycelium in plant debris
Pathogen spread by soil, water, and
farm machinery
Disease favored by moisture
Babadoost
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Management of Rhizoctonia
infection of Cole Crops and
Crucifer Greens_________________________________________
Crop rotation of 3 years
Avoid poorly drained soils
Minimize moisture in the canopy
Fungicide application (check label)
Endura (boscalid)
Terraclor (PCNB)Babadoost
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Major Diseases of Cole Crops
and Crucifer Greens_______________________________________
Sclerotinia Rot (Fungal) -
Sclerotinia sclerotiorum
Babadoost
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Sclerotinia rot
(white mold)
of cole crops
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Sclerotinia Rot of Cole Crops and
Crucifer Greens__________________________________________
Pathogen survives as sclerotia in soil
Pathogen produces apothecia and
ascospores
Ascospores are wind-borne
Pathogen has broad host-range
Disease is favored by moisture
Babadoost
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Management of Sclerotinia Rot of
Cole Crops and Crucifer Greens_________________________________________
Crop rotation of 3 years
Avoid poorly drained soils
Minimize moisture in the canopy
Fungicide application (check label)
Endura (boscalid)
Babadoost
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Major Diseases of Cole Crops and
Crucifer Greens__________________________________________
Turnip Mosaic (Viral) -
Turnip mosaic virus
Babadoost
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Turnip mosaic
on cole crops
Babadoost
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Turnip
mosaic on
cole crops
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Turnip Mosaic of Cole Crops and
Crucifer Greens__________________________________________
Pathogen is transmitted by larvae
and adult flea beetles of the genera
Phyllotreta and Psylliodes in a
nonpersistant fashion
Pathogen has a broad host-range
Pathogen is NOT a seed-borne virus
Babadoost
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Management of Turnip Mosaic of
Cole Crops and Crucifer Greens___________________________________________
Control insect vectors by insecticides
Babadoost
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Questions