![]() ![]() Fungicides should be applied in 10 to 14 day intervals beginning when the vines have a heavy canopy of leaves. Combine crop rotation, planting of non-susceptible crops, fall tillage, and fallowing areas with a history of the disease with chemical control. Treating this pumpkin disease with cultural control alone is insufficient. There are no disease resistant varieties. Spores are dispersed through water and wind. Warm, humid summer nights favor black rot. Additional Disease Problems with Growing Pumpkins Black rotīlack rot caused by Didymella bryoniae, the same fungus that causes gummy stem blight, results in large gray blotches on the fruit that become black rotted areas. Fungicide applications at the first sign of any of these diseases will aid in reducing and combating them. This disease is most common in the southern United States. Gummy stem blight affects most cucurbits and is caused by both Didymella bryoniae and Phoma cucurbitacearum. Fruit can become afflicted, showing tiny white spots that are more circular in shape than the diamond shaped leaf lesions. White speck, or Plectosporium, also appears as tan spindle shaped lesions on the surface of the leaves. Eventually, the leaves develop small holes and fruit may show lesions as well. ![]() To combat powdery mildew, rotate with non-cucurbit crops and treat with fungicide at the first sign.Īnthracnose, White speck, Gummy stem blightĪnthracnose begins as small, light brown spots outlined with a darker margin that expands as it progresses. It is one of the easiest diseases to identify and unlike other foliar diseases, tends to increase in severity during periods of dry weather. Spores survive among the soil and crop residue, and are dispersed via wind. First seen on the lower leaf surface, powdery mildew is a white “powdery” covering of spores that move from the lower leaf surface to the upper, eventually defoliating the pumpkin plants. Powdery mildew looks exactly like what it sounds like. Powdery mildew, downy mildew, white speck (Plectosporium), gummy stem blight, and anthracnose are the most common foliar disease culprits. Pumpkin Diseases and Treatmentsįoliar diseases of pumpkins commonly afflict pumpkin crops. Foliar disease often opens the plant up to other infectious diseases as well as sunscald. Diseases afflicting pumpkins may be foliar in nature or diseases of the fruit. It is helpful to not only recognize the symptoms of infectious diseases but also to know how they spread and survive. Early detection will enable you to treat the symptoms early on and, hopefully, save the crop. It is important to identify as soon as possible any diseases affecting the pumpkin crop. ![]()
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