Sometimes dark streaks and splotches develop in the spots. If conditions are favorable, the characteristic white growth of spores may be observed on the leafspots.
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 grown in coastal areas. No control measures are recommended. The Regents of the University of California.