Plasmodiophora brassicae 1. Stunted, sickly plants that wilt readily. Follow measures under Black leg. Pseudoperonospora cubensis 1. White downy mold on underside of leaves.
Leaves later turn yellow, shrivel, turn brown and die.
Infected tissues become brown and parchment-like. Cabbage heads may have dark- brown sunken spots on outer leaves. Cauliflower curds may have blackened spots. Begin fungicide applications when diseases become apparent. Continue at weekly intervals.