There are two causes of tomato rotten fruit: First, umbilical rot caused by calcium deficiency, called "black plaster", occurs in fruit enlargement period, and it is prone to occur in soils with thin soil, poor water-holding capacity in new gardens and heavily populated areas. . 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-depleted) control methods for rotten fruit:
1. Spray 1% to 2% of superphosphate or 0.5% to 1% of calcium chloride after fruit set, once every 15 days, and spray twice.
2, increase organic fertilizer, with the use of nitrogen, phosphorus, potassium fertilizer.
3, cultivating loose soil, to avoid the soil too dry or too wet.
Prevention and treatment of pathogenic rotten fruit (late blight):
1. Remove diseased or diseased plants in time and bring them out of the field to burn or bury them deeply.
2, appropriate rotation.
3, in the onset or the emergence of rainy weather, early spraying. The agents used are 1:1:200 times Bordeaux fluid or 600 times chlorothalonil, 800 times carbendazim, and 400-600 times mancozeb, separated by 7-10 days, and sprayed 2 or 3 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.
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