Three methods of pollution-free pest control of vegetables

First, the method of killing insects with plant ash. Plant ash is an important farm fertilizer, which is rich in potassium and other minerals, has excellent insect control effect, and can be used to control onion flies, root maggots, aphids, beetles and so on. One is soil application, 30kg of plant ash per mu, which is best applied in the planting ditch, and then covered with soil after sowing or planting, which can control rhizosphere pests; the other is to spread it directly, spraying the plant ash on the harmful parts of the pests when the dew is not dry in the morning, using 1kg of plant ash per mu. Third, spray plant ash solution, soak 3 kg plant ash with 10 kg water for 3 days, spray plant ash leaching solution after filtering residue, 50 kg per mu.

Second, tobacco pest control method. Tobacco is mainly used to control aphids, bugs, fly maggots and so on. Before preparation, weigh the waste tobacco and water at 1:40, tear up the tobacco leaves, soak and cover them with 10 parts of boiling water, wait for the water temperature to drop to about 20 ℃, knead the soaked tobacco leaves until there is no thicker juice, put them into the other 10 parts of water to continue kneading, after 4 times water kneading, filter the residue out of the tobacco leaves, mix all the tobacco juice and use it for insect control in the field, spraying about 50 kg per mu.

Third, castor leaf insecticidal method. Castor leaves have good insecticidal effect, and the spraying has the effect of replenishing organic fertilizer on crops. This method can effectively control vegetable aphids, cabbage insects, fly maggots, ground tigers, beetles, Plutella xylostella and other pests. The castor leaves can be pounded with water 3-5 times, soaked for 12 hours and sprayed on the surface, or dried in the sun and mixed with soil, and castor oil can be added 5 times to water and rubbed for 12 hours. When applying, choose to spray at sunny day and dusk, 20-40 kg per mu, pay attention to be used with it. Zhou Yuzhi