Answer: The black spot of pepper is a common bacterial disease in the high temperature and rainy season in summer.
Control measures:
1. Seed treatment Seed dressing with 0.3% seed 50% ceric acid copper (DT) wettable powder before sowing.
(2) Agricultural crop rotations are to be carried out for 2 to 3 years with crucifer crops other than peppers; peppers should be ridged and drained in time after rain; timely removal of field sicknesses, and deep-drying after harvest.
3. Chemical control Spraying medicine in the early stage of the disease. 50% ceric acid copper (DT) 1000 times wettable powder, 14% ammonia hydrogen peroxide, 300 times, 77% copper hydroxide (killable) 500 times WP, 72% S. sulphate 4,000 times, 58% metalaxyl MnZn WP 500 times, 60% DES phosphoaluminum WP 500 times, one or more agents, once every 7-10 days, continuous use 2 or 3 times, Note: The drug should be stopped 3 days before harvesting.
There are two kinds of diseases that cause the lesions of pepper fruit, one is the soft rot of pepper and the other is the fungal black spot of pepper. Different from the symptoms of the above diseases, the soft rot of pepper is often found on green fruits. The peels were initially stained with dark green spots, followed by brownish soft rot, with bad odor, and some fruit rotting, and the fruit appeared to be "a bucket of water." In the later period, the diseased fruit dehydrated and shrank, leaving only the white skin hanging on the vine. The disease is a disease caused by bacteria, and the drug for prevention and treatment is the same as above. There is also a fungal melasma, which often occurs at high temperatures, but the lesions on the fruit are initially light brown, nearly round or irregular, and slightly sunken. The lesions are larger (10 to 20 mm), and the black mold layer, pathogenic bacteria, is densely stained on later lesions. The disease is characterized by the occurrence of sunburn in the fruit. For the prevention and treatment of the disease, 50% procymidone WP should be used 1000 times; 64% hymexazil WP should be 500 times, 75% chlorothalonil 500 to 600 times, and 40% Ketandan WP should be 400 times. .
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