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Comprehensive Prevention Technology of Tea Leaf Blight
Tea leaf blight is a common and serious leaf disease in tea plants. The infected plants have poor growth, thin and weak heads, and premature aging, which seriously affect the yield. The prevention and control methods of the disease: First, strengthen management and cultivate robust tea strains. Timely cultivating and weeding, loosen the soil; do a good job of tea garden drainage or drought, cold work, create an environment conducive to the growth of tea trees, promote the robustness of tea trees, and increase resistance to disease. Second, clean up the garden to reduce the source of germs. For seriously ill tea gardens, the diseased leaves should be removed during the winter and spring period, and litters should be cleared or winter plowing should be conducted in the tea plantation. The topsoil should be buried deeply to prevent the disease. During the onset, diseased leaves are removed to prevent infection. Third, timely spraying, control the spread of the disease. Due to the occurrence of this disease, there is a certain relationship between it and small green leafhoppers, mites, black rot and red rust. Therefore, prevention and control of the disease should be combined with the prevention and treatment of the above pests. Optional spray the following agents: 0.6% of the lime half Bordeaux mixture (20 days after spraying can be picked), 70% thiophanate-methyl wettable powder 1000 to 1500 times, agricultural antibiotics, 30 to 50 mg (l) / kg (can be picked after 5 days after spraying), antibiotic antibiotics 1 mg (L)/kg (7 days after spraying), 80% Zinc WP WP 600 to 800 times (15 days after spraying Picking) spraying 60-75 kilograms per mu, spraying once every 10-15 days, spraying twice. In unpicked tea gardens or nurseries, the above-mentioned agents can also be sprayed. Can also be based on the actual situation, appropriate shorten the time, increase the number of spraying, in order to achieve better prevention purposes. For tea green leafhoppers and acarids, the following pesticides can be sprayed according to the pest situation: 40% dimethoate emulsion 500-1000 times, 90% trichlorfon crystal 500 times, and 80% dichlorvos emulsion 500 times. These insecticides cannot be mixed with alkaline pesticide Bordeaux mixture, otherwise it will reduce the efficacy and cause phytotoxicity.
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