The law of occurrence: Botrytis cinerea is a disease caused by fungi. It mainly harms young larvae and leaves and stems. When the female flower was lost, the old grayish-brown layer appeared on the petal, causing the umbilical portion of the young melon to become water-stained, faded, and the diseased part gradually became soft and decayed, and the surface was densely gray-brown moldy. The melon lighter grows stagnant, rots melon head, and the whole melon rots. The lesions on the leaf surface were initially immersed in water and later turned pale brown, forming large lesions. Botrytis cinerea is infected with pathogenic bacteria mycelium or conidia or sclerotium or remains in the soil for winter. Conidia can survive on sick bodies for 4-5 months. Overwintering conidia, mycelia, and sclerotia became the source of infestation the following year. Germs spread by air currents, water splashes, etc.
Control methods:
1. Agricultural control: remove sick bodies and reduce the sources of initial infection in the shed; remove diseased flowers, diseased melons, and diseased leaves in time before seedling stage and melon enlargement, bring them out of greenhouses, and bury deep inside the greenhouse to reduce the sources of re-infection. Strengthen the cultivation and management, strengthen ventilation, water, adequate water, pay attention to insulation, to prevent the invasion of cold currents; high temperature season in greenhouses, greenhouses deep irrigation, keep greenhouses, greenhouses clean.
2. Pesticide control: In the initial stage of greenhouses and greenhouses, smog method or powder tip method can be used for prevention and control. The smog method uses 20% fast-kerosenic smoke or 50% noniline smoke. The dust method sprays 10% speed gram dust agent, 5% chlorothalonil dust agent or 10% chlorpyrifos dust agent. Greenhouses, greenhouses or open fields can be sprayed at the beginning of the disease prevention and control, spray 50% Suo Keling WP, 50% acetaminophen wettable powder, 65% anti-Mouldy mildew wettable powder or 50% thiophanate-methyl wettable powder. The above-mentioned fungicides have better preventive effects than therapeutic effects. After the onset of drug use, the amount of the drug should be appropriately increased.
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