The overwintering fungus serves as the source of primary infections and spores from these infections cycle the disease through the growing season. Spores are readily wind-blown and splashed by rain. Periods of wet weather are necessary for abundant spore production. Fall plowing will bury the remaining debris and promote its breakdown. Rotations which exclude cucurbits for 1-2 years may be beneficial.
Some resistant varieties are available.
Fungicide treated disease-free seed may be helpful.