![]() This does happen in other countries and creates a long-term challenge to vegetable production. infestans pathogen fortunately does not make the sexual, or soilborne, spore known as the oospore. In Wisconsin and throughout the continental United States, the P. Zoospores can swim for approximately 2-10 hours and create new infections within fields and gardens. When moisture is high and there is pooling water on soil surfaces or wetness on leaves, the sporangia can give rise to zoospores, the “spore” type responsible for shorter-distance movement. The pathogen spreads by movement of its sporangia (the primary “spore” type for longer-distance movement) by air or by splashing within a field or garden. ![]() Water molds are known for their multiple “spore” types, each of which plays a unique role in making disease. Phytophthora infestans is the oomycete, or water mold pathogen, responsible for potato late blight. The variability in lesion appearance is often the result of differences in moisture. Symptomatic tubers typically have sunken and firm brown lesions that may extend several centimeters into the tuber. Dark green, brown, or black water-soaked lesions on the stem may also contain sporulation. Enlarged, water- soaked or wet and oily-appearing leaf lesions often give rise to sporulation, identifiable by white or gray fuzzy growth. Leaf symptoms include circular, necrotic or brown lesions surrounded by collapsed pale or chlorotic (pale green to yellow) tissue. Symptoms of late blight can occur on all parts of a potato plant. However, it is most infamously known for its destruction of potato, S. The pathogen that causes late blight, Phytophthora infestans, infects a variety of Solanum spp., including eggplant, pepper, nightshades, and petunia. Destruction of the foliage few days before harvest is beneficial and this is accomplished by spraying with suitable herbicide.Late blight is a disease that typically causes severe symptoms on flowering plants of the family Solanaceae.The resistant varities recommended for cultivation are Kufri Naveen, Kufri Jeevan, Kufri Alenkar, Kufri Khasi Garo and Kufri Moti.Tuber contamination is minimized if injuries are avoided at harvest time and storing of visibly infected tubers before storage.Protective spraying with mancozeb or zineb 0.2 % should be done to prevent infection of tubers.Cloudness before rainfall and Rainfall at least 0.1mm and subsequent days after rainfall.The air borne infection is caused by the sporangia.The diseased tubers are mainly responsible for persistence of the disease from crop to crop.The infected tubers and the infected soil may serve as a source of primary infection.In tubers, purplish brown spots and spread to the entire surface on cutting, the affected tuber show rusty brown necrosis spreading from surface to the center. ![]()
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