In the production of vegetables, cabbage caterpillars are pests that are more harmful to vegetables. It feeds plant leaves, flowers, and fruits, and eats the leaves in severe cases. At the same time, the wounds that were eaten by cabbage caterpillars were easily infested by soft rot pathogens, causing disease epidemics. Therefore, it is very important to control cabbage caterpillars. The traditional methods of prevention and control mainly use chemical pesticides. The disadvantage of using chemical pesticides is the large amount of pesticide residues that affect human health. Here are 10 kinds of pollution prevention methods for your reference. First, artificial pests pick up vegetables in winter and 20 meters around the scaffolding on the brick cabbage caterpillar, combined with deep-turning the soil to freeze the soil in the winter of insects. In spring, summer and autumn, the cabbage caterpillars and larvae on the cabbage leaves can be artificially pinched. After the harvest, leaves and other residues in the vegetable fields were promptly removed. Second, bitter bark powder control with 50% bitter bark powder sprinkled on the vegetable strains, 1.5 kg / acre, once in the egg hatching peak period, can effectively control the cabbage caterpillar damage. Azadirachta indica leaf prevention and treatment of fresh buckwheat leaves 1.5 kilograms, smashed after adding 1.5 kilograms of water, after filtration to the residue, 1 kilogram of sap and 40 kilograms of water spray, can prevent cabbage caterpillar, vegetable aphids and so on. Fourth, skunk leaf to prevent stinkbug leaf 1 part of water 3, immersed for 1-2 days, the water immersion liquid filtered and sprayed, can control cabbage caterpillar, aphids and so on. V. Cucumber Manganese Bacteria 1 kilogram will be fresh cucumber, add a little water smashed, filtered residue, sprayed with sap plus 3 times water, can control cabbage caterpillar and vegetable borer, control effect of 95%. Sixth, pepper 0.5 kg of fresh red pepper, mash 5 kg of water, heat and cook for 1 hour, take the filtrate spray, the higher the concentration the better, can control cabbage caterpillar, vegetable worms and so on. Seven, pig bile liquid governance pest 10% concentration of pig bile plus appropriate amount of baking soda, washing powder, can drive beans, green beans and other vegetables on the cabbage caterpillar, balance release liquid can be maintained for 10 days effective. Eight, insect pest control 0.2% cabbage worm fluid solution to control cabbage caterpillar is: per mu pick 100 grams of cabbage caterpillar, mash, watered 250 ml, plus 50 grams of detergent mix, and then watered 50 kg spray, The control effect can reach more than 90%. Nine, the natural enemy pests use spiders, ladybugs and other natural enemies pest management, or artificial release butterfly butterfly gold wasp. Ten, superphosphate or lime water ovulation pest control with 1% -3% of superphosphate or 1% -3% of lime aqueous solution, 1 week can avoid eggs more than 50% for 5 days the effect of up to 80% the above. China Agricultural Network Editor