In recent years, one of the most common diseases on persimmon trees is black spot disease. The environment with high temperature and high humidity is more conducive to the onset of disease, and the temperature rises after the rain or the summer rainy season is heavier. It usually begins in early June and begins to fall in mid-July. Most farmers will take the following measures to prevent: 1. Remove the primary infestation source, combine the winter shears to remove the diseased branches, remove the diseased fruit in time, remove the fallen fruit, concentrate burning or deep burial. The whole garden is sprayed with carbendazim or nail cream, and azoxystrobin chlorothalonil for disinfection and sterilization to reduce the spread of pests and diseases. 2. Strengthen cultivation management, especially fertilizer and water management, to prevent the occurrence of long branches. The weak tree can spray some new high-fat film 500 times liquid, reduce pesticide toxins, and improve the application effect of pesticides or fertilizers. 3. The effect of spraying chemicals in the middle, middle and late July and early August is significant. It can be sprayed with a targeted pesticide bactericide to inhibit the replication of pathogens, reduce its resistance and dosage, and improve the effect of pesticides. Persimmon black spot bacteria mainly overwinter in mycelium in the branch disease or diseased fruit, leaf marks and winter buds. The mid-summer produces conidia in the early summer, spread by wind and rain insects, infecting new shoots and fruits. More pesticide knowledge , please pay attention to China Pesticide Network
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Persimmon black spot prevention and control technology