Bitter gourd scientific name Momordica charantia L. alias Lianggua, an annual climber of the Cucurbitaceae herb, is a famous vegetable. Root medicine can eliminate heat and detoxify. There are plantings throughout the country.
Symptoms mainly affect the leaves. Newborn roundish pink spots, ranging in diameter from 4 to 6mm. When heavily damaged, the spots are densely distributed on the leaves and connect with each other, resulting in yellowing of the leaves, eventually causing dryness, impeding plant growth and fruiting, shortening the growth period, and yield. reduce.
The pathogen Erysiphe cucurbitacearum Zheng & Chen said that powdery mildew and Sphaerotheca cucurbitae (Jacz) ZYZhao of the cucurbit family called melon monoclospora powdery fungus, belonging to Ascomycota spp. The asexual stage of the two bacteria is Oidium sp., which is a fungus belonging to the genus Fungi.
Transmission routes and disease conditions In cold regions, the two pathogens overwinter on the host or on the diseased body with mycelium or closed capsular sac, the first infestation with ascospores in the following year, and the constipation in the latter case for reinfection. The disease spreads and spreads. In warm areas, pathogenic bacteria do not produce closed cysts, initial infection and re-infestation with conidia, complete its annual cycle, no significant wintering period. Usually warm and wet stuffy weather, excessive nitrogen fertilizer or fertilizer application, excessive plant growth or adverse disease.
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