problems Guide
Small circular or irregularly shaped dry spots which are gray to straw in color on leaves
A high number of spots may cause the leaf to die; lesions may coalesce to form large necrotic patches causing leaves to turn yellow and wilt; lesions may split or crack in dry centers
Fungus overwinters on leaf debris and on related weeds; disease emergence is favored by moist, warm conditions
Lesions may coalesce to form large necrotic patches causing leaves to turn yellow and wilt; lesions may split or crack in dry centers; dry sunken spots on roots which enlarge and turn gray or brown
Control of disease depends on sanitary practices
Treat seeds with hot water prior to planting
Rotate crops
Plant in an area with good soil drainage
Remove all cruciferous weeds which may act as a reservoir for the fungus
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