There is no source of resistance to this race. Wilt losses are managed by following a five year rotation program with non related plants and use of resistant varieties. Gummy Stem Blight Gummy Stem Blight is a warm weather southern disease. It is caused by seed borned fungus Didymella bryoniae . All cucurbits are susceptible, and depending on the weather, stem and leafspotting may occur on young plants, especially in late plantings.
Early symptoms are round black, wrinkled spots on young leaves and dark sunken areas on stems.
Early infection usually develops from contaminated seed. Many times it produces brownish circular spots which rapidly expand into large tan lesions of round, indefinite size. The lesions may exhibit brown gummy exudate on the surface and stems may be girdled. In prolonged rainy periods most of the foliage and vine may rapidly collapse. Fruit lesions appear as small water-soaked areas, similar to anthracnose, which rapidly enlarge to indefinite size.