There are two reasons for tomato rotten fruit: First, umbilical rot caused by calcium deficiency, known as "black plaster", occurs in the fruit expansion period, in the soil is thin, poor water retention capacity of the new park and the risk of the disease is prone to the disease . The second is the late blight caused by fungi. First, a dark brown spot develops on the side of the immature fruit and gradually expands. When the weather is wet later, a small amount of white mold is produced on the lesion. Physiological (calcium-deficient) rotten fruit control method: After fruit set, spray 1% to 2% of superphosphate or 0.5% to 1% of calcium chloride, spray at intervals of 15 days, and spray twice; increase. Organic manure, with the use of nitrogen, phosphorus and potassium fertilizers; cultivating loose soil to avoid excessive dryness or excessive humidity. Prevention and treatment of pathogenic rot fruit disease (late blight): remove diseased fruits or diseased plants in time, bring out burned or buried fields; appropriate rotation; spray medicine as soon as possible on the onset or in continuous rainy weather. The used agents are 1:1:200 times Bordeaux, 600 times chlorothalonil, 800 times carbendazim, 400-600 times mancozeb, sprayed 7 to 10 days, and sprayed 2 to 3 times. Times. Spraying is focused on the lower part of the plant and the fruit. After 4 hours of spraying, heavy rain is required for rain. Http://
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