Field Applications of Fungicides Improve Quality and Size of Some Pumpkin Cultivars
Commercial producers of pumpkin (Cucurbita pepo) in the mid-Atlantic region frequently experience losses of fruit size and quality from the fungal diseases powdery mildew (Erysiphe cichoracearum) and black rot (Didymella bryoniae). In addition to loss of fruit size in some cultivars, the diseases can result in poor quality handles (fruit stems) and pre- and postharvest decay. Since the pumpkins are grown for ornamental use, their appearance, size, and quality are important in marketing strategies. Applications of recommended fungicides during the growing season, although costly, reduce losses in fruit size and quality in susceptible cultivars during years in which the pathogens become established prior to fruit maturity. Larger-fruited cultivars, in general, benefit more from fungicide application than smaller-fruited types in fruit weight, although both benefit in improved handle quality. Cultivars with apparent tolerance to fungal diseases are identified for producers who choose not to use fungicides.