Aphids are important pests in vegetable production. In North China, more than 10 generations occurred in 1 year, which seriously harmed the host plants, resulting in leaf contracture, growth stagnation, secreted honeydew, and miscellaneous bacteria in the leaves, severely affecting photosynthesis, resulting in premature leaf dryness. Death, plants can not be normal twitching, flowering, and fruitful. In addition, locusts can also transmit a variety of viruses. The harm caused by virus transmission is far greater than the harm of locust itself, and pollution-free technical measures should be used to strengthen prevention and control. 1. Agricultural control (1) According to different varieties have different resistance to insects, insecticide resistant varieties should be selected for production. (2) Remove the weeds in the field in time, clean the overwintering place in time in the cultivation of greenhouses, and timely prevent and control some mites in the spring when the mites have not yet migrated. (3) Appropriate early sowing, so that after the plant grows, it can reduce the degree of harm to the aphid. 2. Physical control (1) Silver gray film avoidance. Arrangement of silver-grey plastic strips around the open-air cultivation rakes or at the air outlets of greenhouses can significantly reduce the amount of maggots. (2) Use insect nets. In the early spring and autumn when growing vegetables, the silver-gray or white gauze covering the 40-45 mesh on the nursery pot after sowing can prevent the aphids from touching the seedlings and reduce the damage of the mites. The insect-proof nets are the best for the air outlets in the greenhouse. (3) Yellow traps. Using the winged dragonfly's tendency to yellow, cut the old planks into 40cm squares, painted with yellow advertising color, and then coated with a layer of No. 10 engine oil and a small amount of butter and mix well with viscous oil, inserted in the row, slightly higher than Plants are suitable, so that the food can occur in the late evening about 15 days, the number also decreased. 3. Biological control. Protect and use natural enemies and exert natural control. The natural enemies of common locusts are the seven-spot ladybug, the thirteen-spot ladybird ladybug, the nymph fly, the grass beetle, and the nymph wasp. When the ratio of the average number of locusts per plant to the sum of the average number of natural enemy hoppers per plant is less than or equal to 1.67, This shows that natural enemies can control locusts at this time; if it is greater than 1.67, it means that the density of locusts cannot be controlled, and artificial breeding of natural enemies and release techniques should be actively carried out. 4. Chemical control (1) Washing powder smashing. The main ingredient of laundry detergent is sodium dodecyl benzene sulphonate, which has a strong contact effect on maggots. It is sprayed twice with 400-500 times liquid and the control effect is above 95%. If the detergent, urea, and water are mixed and stirred at a ratio of 0.2:0.1:100 and the affected plants are sprayed, they can receive the effects of extermination and fertilization. (2) The tobacco lime aqueous solution wipes out the earthworm. With tobacco 0.5kg, quicklime 0.5kg, a little soap, add water 30kg, soak 48 hours filtration, juice spray, the effect is significant. (3) Pesticide elimination. There are 50% of commonly used pharmaceuticals. It is 2000-3000 times that of wolfberry wettable powder. This medicine has special effects on rapeseed (Brassica oleracea, radish sprouts, peach pods, etc.), but it has poor effect on quails and does not harm natural enemies. 10% nicotine emulsifier 500-1000 times liquid, the residue is only 36 hours, low toxicity, low residue, no pollution, no resistance, low cost. 3.2% bitterrin is highly effective and effective. 22% of dichlorvos smoke can be used in protected areas, 500g closed smoke per 667m2, less pesticide residues, and good control effect. (Wang Jiali, Agricultural Bureau of Jiaxiang County, Shandong Province)
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