problems Guide
Seedlings develop wilted yellow to brown leaves and collapse
Yellow, V-shaped lesions on mature leaf margins
Root and crown necrosis; lower portion of petioles black and necrotic; black ring around petiole attachment black
Dark rings can be found in the cross section of the stem
Disease emergence favors warm, wet conditions
Primary control methods based on good sanitation
Plant disease-free seed
Rotate crops every 2 years or less to non-brassica; avoid sprinkler irrigation.
Plow crop residue into soil immediately after harvest; plant resistant varieties; plant only pathogen-free seed; treat seeds with hot water prior to planting
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