Tea cloud blight is a common and serious leaf disease in tea plants. The affected plants are not strong, the heads are thin, and the premature aging is bad, which seriously affects the yield. The prevention and treatment of the disease:
First, strengthen management and cultivate robust tea plants. Timely cultivating and weeding, loosening the soil; doing well in the tea garden drainage or drought-resistant and cold-resistant work, creating an environment conducive to the growth of tea trees, promoting the robustness of tea trees and improving disease resistance.
Second, clean up the pastoral and reduce the source of germs. For seriously ill tea gardens, the diseased leaves should be removed during the winter and spring periods, the litter should be cleared or the tea garden should be ploughed, and the topsoil diseased leaves should be buried deeply to block the source of the disease. During the onset of illness, the diseased leaves are removed to prevent the onset of infection.
Third, timely spraying pesticides to control the spread of diseases. Because the disease occurs with small green leaf mites, mites, black rot and red rust. Therefore, prevention and treatment of the disease should be combined with prevention and treatment of the above-mentioned pests and diseases. Optional spray of the following agents: 0.6% lime half-size Bordeaux mixture (can be picked 20 days after spraying), 70% methyl thiophanate WP 1000-1500 times liquid, agricultural antibiotic ketone 30~50 mg (liter) / kg (5 days after spraying), antibiotics amphotericin 1 mg (liter) / kg (7 days after spraying), 80% Dyson zinc wettable powder 600 ~ 800 times liquid (15 days after spraying) Picking), spraying 60-75 kg per acre, spraying once every 10-15 days, a total of two sprays. The above agents can also be sprayed in unpicked tea gardens or nurseries. According to the actual situation, the time can be shortened appropriately, and the number of spraying can be increased to achieve better disease prevention purposes.
For the tea green leafhoppers and mites, the following agents can be sprayed according to the insect condition; 40% dimethoate emulsion 500~1000 times solution, 90% trichlorfon crystal 500 times solution, 80% dichlorvos emulsion 500 times solution. These insecticides cannot be mixed with the alkaline pesticide Bordeaux mixture, otherwise it will reduce the efficacy and cause phytotoxicity.
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