Hainan is affected by geography and climate in winter. Thrips and aphids are more common. They occur in large quantities and cause serious damage. They are easy to induce plant virus disease and other diseases, resulting in widespread disease and insect pests. Therefore, prevention and control should be carried out timely and effectively in production. (1) Preparation before sowing (1) Selection of the surrounding area should not choose vegetables from the surrounding environment, away from villages and forests, away from weeds, no continuous cropping of melon crops, fertile soil, convenient irrigation and drainage, well-ventilated fields . (2) Weeds and foreheads are thoroughly removed from the field, dried and burned, and weeds can be applied to the weeds outside the field using suitable herbicides in sunny and windless conditions. (3) Deep plowing before sowing, at the same time disinfecting with 25 to 35 kilograms of lime soil per acre, which can balance the soil pH and play a certain role in insecticidal bactericidal sterilization. (2) Sowing and sowing at an appropriate time will be affected by typhoon too early, too late, the high growth period of thrips and aphids will affect the normal growth and development of the plants, and even they will not be planted successfully. The open field planting should be done after the last typhoon; in normal climate, it is more suitable to sow in the end of October to early November. Nursery seedlings can be nursed in the late September and transplanted from the end of October to the beginning of November. Because the pests are light after the typhoon, sowing and transplanting are more appropriate. (3) Strengthening field management The timely removal of weeds in the field, increasing irrigation, regulating the microclimate in the field, and suppressing the population of insects will help prevent the migration of the thrips and aphids and destroy the host. Strengthen the management of fertilizer and water, promote the vigorous growth of plants can reduce the harm, due to the soil by the typhoon shower, soil fertility is insufficient, in addition to the base fertilizer, timely fertilizer to promote growth, application of fertilizer per acre 10 to 25 kg, or potassium sulfate 2.5 ~ 5 kg, urea 5 ~ 15 kg, spraying potassium dihydrogen phosphate 0.04 kg. Because of the small size and large number of worms, the humming horse has the most serious damage to growing points. The normal rapid growth and development of plants is the basic guarantee for effectively preventing humming horses. If there is a phenomenon of soil compaction, cultivating in time is required to promote the growth and development of roots and prevent wilting of plants. Once it encounters a relatively low temperature, resulting in slow growth, the occurrence of the threat of thrips will be very serious, and more attention should be paid to the timely application of pesticides for prevention and control. Occurrence of locust infestation, prevention and control of essentials (applicable stems or petioles for systemic pesticides, 5 to 7 days if necessary, even for 2 or 3 times). (IV) Chemical control The prevention and control of thrips and aphids should be controlled by strong absorbable agents. Currently, high-efficiency, low-toxicity, long-acting agents are used, and they are sprayed every 7 to 10 days from the seedling stage. % imidacloprid wettable powder 1500 times, or 10% imidacloprid wettable powder, imidacloprid 1500 times mixed 2.5% avermectin cream is effective against thrips and aphids, or 2.5% avid with acetamiprid Bactin Sustained Emulsion can effectively control, or use 2000-3000 times of 2.5% deltamethrin EC, 2000-3000 times of good year of winter EC, or 2000-3000 times of 4.5% cypermethrin EC. The use of pyrethroids in improper concentrations is prone to melon phytotoxicity, and more attention should be paid to the concentration. Pharmacists of different natures should be used alternately to avoid phytotoxicity of the plants or resistance to thrips and aphids.
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