Anthracnose: The disease occurs from the seedling stage of watermelon to the whole growth period. When the seedling is injured, round or semi-circular brown or dark brown spots appear on the edge of the cotyledon, and the surrounding area often has yellow or light brown halos. Small grain or light red sticky material.
The disease mainly affects the stems and leaves. The lesions on the leaves are round or irregular, sometimes showing a "V" shape or a semi-circular large spot. There are many small black spots on the light brown to brownish spots.
First, the temperature difference between day and night in the watermelon seedbed is small. After emergence, the temperature is controlled between 23-25°C during the day and the temperature is controlled at 16-18°C during the night.
The second is to reduce the air humidity in the shed during the daytime in the shed, and the mulch inside the shed should be covered with a mulch to reduce the increase in water vapor.
Third, in the case of continuous rainy weather, it suddenly turns cloudy, and the shed must be covered with straw shade to prevent the temperature difference from being too large and causing the melon seedlings to stumble.
Fourth, the diseased plants must be removed in a timely manner and brought out of the shed.
Fifth, chemical control. You can use a smoked smoking agent 0.2-0.3 g / square meter, in the greenhouse for smoking (each block 25 grams smoked 90 cubic meters), or 64% antiviral 500 times mixed with mancozeb or Fome zinc, etc. The foliar sprays are alternated every 5 days for 3 consecutive applications. For the occurrence of diseases under special climatic conditions or guajava seedlings, 25% of amidoxime suspension agent can be sprayed 1500 times per mu.
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