At present, entering the greenhouse vegetable production period, especially under conditions of high temperature and humidity, low temperature, high humidity or high water and fertilizer, poor ventilation and light transmission, is conducive to the spread and spread of pests and diseases. The main pests and diseases are: downy mildew, powdery mildew, and gray Mildew, disease, leaf mold and aphids, whitefly, tea tree borer, leafminer, etc., if not timely control will affect the yield and quality of vegetables, causing greater economic losses to vegetable farmers. The prevention and control methods are introduced as follows:
1. Disease prevention and control:
(1) Agricultural measures: Selection of disease-resistant varieties, scientifically controlling temperature and humidity according to crop habits, rational watering, balanced fertilization, and improvement of plant resistance to disease.
(2) Chemical measures: After the central diseased plant is found or in the early stage of the disease, spraying protection and prevention shall be promptly applied. Pay attention to the rotation of the drug in order to improve the efficacy and delay drug resistance. Optional 50% fast-king WP 2000 times, 75% chlorothalonil or 58% metalaxyl-manganese zinc wettable powder 500-600 times spray; smoke control can also be used, with 45% chlorothalonil Smoke agent fumigation, 200-250 grams per acre, 7-8 days 1, once every 2-3 times.
2. Pest control:
(1) Agricultural measures: timely removal of diseased leaves and diseased fruits, removal of old leaves and dead leaves from the lower part of the plant, and centralized treatment; utilization of the characteristics of aphids, whitefly, and leaf flies to yellow tendencies to produce trapping of yellow plates.
(2) Pesticide control: smoke method can be used 35%, 45% chlorothalonil smoke agent, 30% chlorothalonil smoke bomb, 10% fast Ke Ling smoke agent, 15% carbendazim smoke agent, 10% procymidone smoke 200-250 grams of agent, etc., to ignite smoke prevention and control of gray mold, downy mildew, powdery mildew; spray method can be 1.8% avermectin or 73% chlorate EC 1500-2000 times foliar spray, pay attention to alternate medication, master Appropriate concentration, full spray.
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