According to statistics, there are more than 30 kinds of common diseases in the process of watermelon planting in China, which can cause up to 30% of losses, so the production of watermelon is very large. To this end, a set of prevention and control technologies that can meet the standards of green foods are summarized for reference by the majority of growers. First, ecological regulation 1. Rotation Rotating with other vegetables. 2, clean the countryside Remove weeds in the field and surrounding areas, deepen the land to destroy the wintering places of pests and diseases, and reduce the number of pests and diseases. 3, fine land preparation 1) Soil disinfection Soil-borne diseases can be deepened 25cm in the summer high temperature season, 500kg chopped straw or wheat straw is applied per 667 m2, 100kg cyanamide calcium is added, mixed, ridged, and filmed for 20 days. . 2) shed disinfection Spray disinfection of sheds, floors, roofs, walls and agricultural implements with 50% carbendazim WP 500 times. 4, fitness cultivation 1) Selection of resistant varieties According to the occurrence of local pests and diseases, select resistant varieties, such as Luqing No.7 and Jinpai Sweet King. 2) Seed disinfection Soaking seeds in warm soup: Pour the seeds into warm water at 55 ° C and stir constantly until cool at room temperature. Mixing with 10 billion live spores/g Bacillus subtilis 100 times can prevent anthrax. 3) Grafting seedlings Generally used plug-in method, special white seed pumpkin rootstock. 4) Soil treatment Before planting, use >500 million/g Bacillus subtilis + Bacillus spore-forming bacteria 10Kg to improve soil ecology and prevent soil-borne diseases such as blight. 5, immune temptation After the seed is released, spray 5% amino oligosaccharide 1000 times solution every 10 days or so, and spray a total of 2-3 times. Second, biological control 1, biological fungicide 1) Use the 0.3 billion/ml Verticillium lecanii spray to control Bemisia tabaci. 2) Acupoints of Paecilomyces militaris 800-1000g/667m2 to control root-knot nematodes. 3) Use Bacillus subtilis to control leaf diseases such as powdery mildew, blight, and gray mold. 2, natural enemy control 1) Bemisia tabaci: The release of the larvae is started within a week of colonization. Generally, 2000-3000 bees are placed every 667m2 times; when more than 10 adult whiteflyes are used, the agent can be used once to control the base, and the base is pressed down. After 7 days, the bees are placed once and the bees are 2-3 times. 2) Hummer: Release the small calyx at the beginning of the occurrence, the release amount is 300-600 heads/667 m2, and release once after 10 days, releasing a total of 2-3 times. 3) Red Spider: Use Chilean plantlets to release at 667m2 10000-15000 heads at the beginning of each occurrence, and release every 7-10 days until the end of production. 2) Disease prevention Leaf spot disease: It can be sprayed with 10 billion/mL Bacillus polymyxa 300-500 times solution. Botrytis cinerea: sprayed with Bacillus subtilis + 10% polyclonal antimycin. Powdery mildew: 150-200 times solution of 1% Wuyincin water, or 1200-1500 times of 10% Ningnanmycin soluble powder, or 500-750 times of 8% pyrimidine nucleoside antibiotic wettable powder. Third, scientific medication 1. Tripping disease: It can spray 72.2% of the mildew water-repellent agent 800 times solution, or 10% of the difenoconazole water-dispersible granule 2000 times solution. 2, blight: spray 70% methyl thiophanate WP 800 times solution, or 46% copper hydroxide, or 6.25% famoxadone + 62.5% mancozeb spray. 3. Powdery mildew: spray with 25% azoxystrobin SC34g/667m2 or 10% difenoconazole 1000 times solution. 4, anthracnose: in the early stage of the disease using 62.5% manganese nitridazole WP WP 600-800 times solution, or 6.25% oxazolone + 62.5% mancozeb water dispersible granules 1500 times spray, 25% prochloraz emulsifiable concentrate 2000 times. 5. Root knot nematode: The soil can be treated with 1.8% avermectin or 41.7% fluopyram SC. As the resistance of pests and diseases increases, the frequency of occurrence becomes higher and higher, and the demand for green foods in the market is also increasing. Therefore, the prevention and control technology has a large application space.
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