The pests that endanger watermelons mainly include anthracnose, blight, wilt, disease, aphids, and yellow guava. We do a good job of comprehensive prevention and control, and we mainly focus on the following technologies.
Soil disinfection. 60-80 kg of quicklime per mu can be used to disinfect the soil. Seed bed with 50% thiophanate WP 4 grams per square meter, mixed fine soil 100 grams, evenly spread on the bed, cover soil after sowing.
Seed treatment. It is best to use high-resistance varieties, soaked in warm water at 55°C for 15 minutes before sowing, or soaked with 50% carbendazim wettable powder 200 times for 4 hours, or soaked with formalin 100 times for 30 minutes, then with clean water Wash and sow again.
Chemical control. 1. Seedling stage should be controlled as soon as possible. Once a diseased plant is found, it should be immediately removed and some lime be sterilized in the root hole to prevent the disease from spreading. 2. Stretching and preventing anthrax. Can be used 1 : 1: 2000 (0.5%) Bordeaux spray 1 or 2 times, can also use 50% carbendazim 500 times spray 1 to 2 times, the effect is better. 3. Control the blight and disease in the guava period. Prevention of blight can be used 1:2.0:200 Bordeaux mixture, 65% dexamethasone WP 600 times or 50% thiophanate-methyl WP 800 to 1000 times, spraying once every 5 days. The prevention of diseases can be sprayed with 25% of 1500 times that of virgin mycorrhizal fungi or sprayed with 15% or twice of 75% of the original enemy powder 1000 times. 4. Set melon period to prevent virus disease and blight. Can use 1 million units of streptomycin 10 (mu dose) of water 15 kg, a one-time spray on the guava can control the occurrence of disease. 5. Pest control. Control locust damage, can be used 20% cypermethrin 6000 ~ 8000 times sprayed 1 to 2 times to control. Yellow Squash is used for the prevention and control of pests. It can be used as a 25% insecticide cream 300 times or 90% crystal trichlorfon 800 times. 6. Pharmaceutical Irrigation. Mainly used to prevent root diseases. Such as bacterial bacterial wilt, early detection of symptoms, can be used 50% Garenong 800 times, 50% of copper toxic WP 600 times to irrigate the root, per irrigating solution 200 ~ 250 ml, alternating use, Irrigation once a day for 5 to 7 days, and it has a good effect of irrigation for 2 times.
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