The disease symptoms of watermelon gray mold, the prevention and treatment of watermelon gray mold? Watermelon gray mold occurs in all parts of the country, caused by the infection of Botrytis cinerea of ​​Botrytis genus, which is caused by the wet and rainy areas in the south, causing dead seedlings and rotten melons to reduce production. Harmful to cucumber, eggplant, tomato, kidney beans and other vegetables, let's take a look at the prevention and treatment of watermelon gray mold!
Watermelon gray mold disease symptoms
The gray mold of watermelon is mainly harmful to leaves, stems and fruits. The young leaves are stained with water stains, and then expanded into brown or ink spots, which are easy to perforate. The stalk has an elliptical or longitudinally long black spot with a crack in the middle. The young fruit is born with dark brown sag, and the post-development is blocked and deformed. Fruit lesions are sore-like, some crack or rotten into holes, the disease part secretes a translucent gelatinous substance, and then becomes amber block. When the humidity is high, the surface of each diseased part is densely colored with coal color mildew. Watermelon gray mold can be called a devastating disease of watermelon, which is widespread and difficult to eradicate, seriously affecting the yield and quality, and reducing production by more than 50% until production is eliminated.
The pathogenesis of watermelon gray mold
The mycelium and sclerotia are overwintered in the soil with the mycelium and sclerotia. In the spring of the next year, mycelium produces conidia, sclerotia germination produces conidia discs, and spreads conidia, spread by airflow and rainwater, harming watermelon Seedlings, flowers and young fruits cause initial infection, and produce mildew in the diseased part, further producing a large number of conidia, and infecting watermelon again to spread. When the temperature is low in autumn, the sclerotia sneak into the soil for winter. The suitable growth temperature of the pathogen is 22 to 25 ° C, and the survival temperature is -2 to 33 ° C. The conidia formed a relative humidity of 95%. Therefore, under the conditions of warm and high humidity, the disease occurs more seriously.
Control of watermelon gray mold
- Biological preparation: You can use 1% Wuyincin water 200 times solution, spray 20-30 kg per acre, spray once every 7 days, and spray 2~3 times continuously.
- Chemical pesticide: 50% procymidone or iprodione wettable powder 1000-1500 times solution, or 60% anti-mildew WP 500 times solution, or 70% thiophanate-methyl WP 800 The liquid is sprayed once every 7 days and continuously sprayed 2 to 3 times. 40% Shima Le Suspending Agent or 21% chlorhexidine or 20% propiconazole emulsion can also be used, which has good control effect.
Watermelon gray mold agricultural control
- Rotation is carried out for more than 3 years, and fertilized with fully decomposed organic fertilizer.
- Mulch soil disinfection per square meter of nursery bed or planting hole with 70% dipyridamole powder 1000 times liquid 4 ~ 5 kg watering.
- The shed disinfection is sterilized with chlorophyll smog or isoform urea smog, and each greenhouse is 0.25 kg, smoked once every 8 to 10 days, and even smoked 2 to 3 times.
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