Symptoms and Signs
This fungus causes circular, light tan leaf spots that are up to 0.5 inch in diameter. Sometimes dark streaks and splotches develop in the spots. If conditions are favorable, the characteristic white growth of spores may be observed on the leaf spots.
Comments on the Disease
White spot is a relatively minor and infrequent disease on cole crops. Occurrence is often related to heavy winter rains. The pathogen does not persist in soil, but survives on weed hosts and volunteer crucifers. This pathogen also infects leafy crucifers such as red mustard and tat tsoi grown in coastal areas.
No control measures are recommended.