Symptoms: The base of the stem becomes thin, brown and soft withered and withered. A dark, water-stained round spot formed on the leaves and soon became dry gray. After continuous rainfall, the lesions have expanded. The parts of the stem that invaded the water and the parts that touched the wet ground were dark brown and soft rot. The younger the fruit, the more susceptible it was to disease. First of all, the surface of the fruit surface appears slightly discolored spots of water stains, and then gradually expanded, and there is a layer of gray mold, internal softening and rot.
Pathogens: Form white frost-like to grayish white colonies on the pumpkin fruit, generate zoospore, and zoospores spread by water. The source of dissemination was in the soil, and the diseased plant residues were overwintering in the form of mycelia, oospore, and chlamydial spores.
Control methods: The relationship between the disease and rainfall is extremely close. Even though the fields that occurred in the previous year were dry on sunny days, they hardly occurred. Therefore, there are few diseases in the cultivation of greenhouses, and when the cultivation of small arches is carried out, the plastic film is removed and the onset of disease occurs in the rainy days. When cultivated in open field, there are more incidences in the hot and humid seasons during the Meiyu period. The prevention and control focus is on young fruit. Cover with straw or mulch to prevent stems and fruits from directly contacting the soil surface. Improve field drainage and prevent flooding.
Pathogens: Form white frost-like to grayish white colonies on the pumpkin fruit, generate zoospore, and zoospores spread by water. The source of dissemination was in the soil, and the diseased plant residues were overwintering in the form of mycelia, oospore, and chlamydial spores.
Control methods: The relationship between the disease and rainfall is extremely close. Even though the fields that occurred in the previous year were dry on sunny days, they hardly occurred. Therefore, there are few diseases in the cultivation of greenhouses, and when the cultivation of small arches is carried out, the plastic film is removed and the onset of disease occurs in the rainy days. When cultivated in open field, there are more incidences in the hot and humid seasons during the Meiyu period. The prevention and control focus is on young fruit. Cover with straw or mulch to prevent stems and fruits from directly contacting the soil surface. Improve field drainage and prevent flooding.
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