![]() Leaf spots occur when pathogen spores are splashed onto leaves and when leaf edge is in contact with contaminated soil.įig. Initially leaf spots can be mostly wilted light green tissue with little or no necrotic tissue. They often resemble those caused by Phytophthora infestans, the late blight fungus, being dark brown and typically large with a border of wilted light green tissue which is where the pathogen is progressing as it infects. 2: Leaf spots are an uncommon symptom of Phytophthora blight, possibly reflecting fungicide use. ![]() The pathogen, Phytophthora capsici, causes seedling damping-off, leaf spots, foliar blight, root and crown rot, stem lesions, and fruit rot.įig. View symptoms on: peppers | eggplants | tomatoes | beans Phytophthora blight also commonly affects peppers and less commonly affects eggplant and tomato. The increase followed a hurricane in some areas. Then incidence increased notably in Florida, Georgia, North Carolina, New Jersey, Michigan, and the Northeastern U.S. until the 1980’s, except in California, where it occurred more regularly. The disease was found sporadically in most of the U.S. Fruit rot was first reported in Colorado and California in the late 1930’s. It has been increasing in importance in the U.S. While all cucurbits are susceptible, squash, cucumber and pumpkin seem to be affected more commonly than cantaloupe. It has been described as the “most destructive disease of cucurbits” because “nothing causes greater loss.” Total crop loss is possible, as in this pumpkin field (Fig. Phytophthora blight is a disease that should be a concern to all cucurbit growers. Results from research conducted at LIHREC on managing Phytophthora blight.What Have We Learned About Managing Phytophthora Blight in Cucurbit Crops?.Mobile Fungicides for Managing Three Major Cucurbit Diseases: Powdery Mildew, Downy Mildew, and Phytophthora Blight. ![]() Fungicides for Managing Phytophthora Blight in Cucurbits and Other Vegetables.This factsheet contains information on the following: (Originally prepared for Vegetable MD Online May 2001.) ![]()
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