Aphids are the pests with the largest amount of vegetables and the longest period of damage. With the increasing application of pesticides, the drug resistance of aphids has been increasing year by year. Therefore, the use of pollution-free treatment can improve the control effect and reduce the production cost. Second, it can reduce pesticide residues and achieve pollution-free purposes. Common non-pollution prevention methods are mainly seven methods: 1. Yellow plate inducement. Winged crickets have strong tropism towards yellow and orange yellow and can be stalked and killed by yellow plates coated with No. 10 motor oil. The size of the yellow plate is generally 15-20 cm square, which is the same as that of the vegetables. Yellow plates must be promptly replaced after being full. 2, silver gray film to avoid. Silver-gray has a strong repellency against locusts, and can hang silver plastic strips in the field or cover the vegetables with a silver gray mulch. Prevention and control of autumn cabbage locusts, can be taken immediately after sowing cabbage 0.5 m arch shed, every 0.3 meters vertical and horizontal pull a silver-gray plastic film, covering about 18 days, when the seedlings 6-7 true leaves when the shed colonization. The avoidance effect is more than 80%, reducing the use of drugs 1-2 times. 3, washing powder off series. The main ingredient of laundry detergent is sodium dodecyl benzene sulfonate, which has a strong contact effect on locusts. Therefore, 400-500 times more liquid detergent can be used to kill maggots, mu liquid with 60-80 kg, even spray 2-3 times, can receive better control effect. 4, the plant destroyed. 1 tobacco ground into fine powder, add a small amount of lime powder applicator; 2 pepper soaked in water for a day and a night, filtered and sprayed; 3 peach leaf soaked in water for a day and night, add a small amount of quicklime filtered and sprayed. 5, plant drive flooding. Volatile odors of leeks have a repellent effect on locusts. If they are planted with other vegetables, they can reduce the density of locusts and reduce the damage of locusts to vegetables. 6, eliminate the source of insects. The stubble leaves near the vegetable fields and the stubble leaves of the vegetables after harvest are the main wintering hosts of the locusts. Therefore, it is necessary to thoroughly clean the fields before winter, winter and spring to remove the weeds near the vegetable fields. 7, protect the enemy. The natural enemies of locusts are the seven-spotted ladybugs, the harmless ladybugs, the grass crickets, the food fly caterpillars, the food crickets, and the fungus pupa. They should take care of the locusts and use them to keep the population of locusts under control.
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