Pieris rapae is a relatively serious pest in northern China's vegetable production areas. It mainly affects cruciferous vegetables such as cabbage, cauliflower, cabbage, radish and rapeseed. In recent years, due to the serious damage of cabbage caterpillars, chemical resistance has caused the cabbage caterpillar to produce a strong resistance to drugs, resulting in difficulties in prevention and control. In view of this situation, comprehensive prevention and control methods can be adopted. 1. Agricultural control law. Cruciferous vegetables should be cleaned in a timely manner after harvesting, and the old leaves of diseased plants should be removed in order to eliminate the breeding sites of the cabbage caterpillar and eliminate some of the earthworms, thereby reducing the population of insect populations. 2. Control of chemical agents. The field egg stage and larval hatching period of the cabbage caterpillar is the most vulnerable period of its life. In the morning or evening, it is evenly sprayed on the back of the leaves of vegetable plants, which can play a very good control effect. While grasping the appropriate control period, we must choose a highly effective, low-toxic pollution-free pesticide control, such as 2% of avermectin EC 800-1000 times, or 2.5% of KDF 2000 times, alternating between two agents. Use, continuous spray 2-3 times to achieve the desired control effect. Bath Board Seat,Bath Board White,Bath Wine Board ,Bath Boards And Seats Active Life Healthcare Co.,Ltd , https://www.alh-med.com