The diamondback moth (Plutella xylostella L.) is a major vegetable pest in the world. It mainly affects cruciferous vegetables such as cabbage, broccoli, cabbage, vegetables, rape, and radish. During the year, there were many generations of algebra and long duration of damage. All the insects of the diamondback moth could be seen in Huaining County throughout the year. There was no obvious phenomenon of overwintering and over-summering. Young instar larvae before the 2nd instar burrowed into the leaves for feeding and feeding. Only the epidermis of the leaves remains, forming a transparent spot called "open skylight." After the 3-4 larvae damaged the leaves, they formed nicks or holes, which became severely reticular and severely affected the quality of the vegetables.

Vegetable farmers are very difficult to control, and they not only increase the cost of control, but also affect the quality of vegetable products. According to the plant protection policy of “prevention-oriented, comprehensive prevention and control”, the following comprehensive prevention and control methods should be adopted:

1. Agricultural Control Law: Avoid continuous cropping and cruciferous vegetable cultivation when growing vegetables. Crops that have been planted with cruciferous vegetables can be cropped with crops such as tomato, lettuce, and potatoes; and insects are cleaned in time after harvest. Reduce the population base.

2. Physical prevention and control method: Using the characteristics of phototaxis of adults of Plutella xylostella, the use of insecticidal lamps to trap adult insects can reduce the population density of insects in the field, reduce the use of pesticides, and reduce the cost of vegetable farmers.

3. The method of prevention and control of sexual attractants: using synthetic insect sex hormone (sex attractant) to trap and kill the diamondback moth, put 10-15 lures on the mu, replace it once in 10 days, change it once in high temperature and dry season, and replace it once every 7 days, on adult of Plutella xylostella The trapping effect is good, and it can effectively protect and use natural enemies and reduce the number of chemical pesticides used in production.

4. Chemicals prevention and control method: timely control of insect pests, and spray control of pesticides when the population density reaches a certain amount. The selected agents are: (1) Mu with 25% vegetable emulsion 1000 times spray control. (2) Mu with 40% Chrysanthemum EC 2000-3000 spray control. (3) Mu using 0.3% matrine 500 times spray control. One or two of the above agents are optionally used alternately until the degree of harm is substantially controlled. The use of vegetables was stopped 7-10 days before harvest to reduce pesticide residues and allow consumers to eat vegetables at ease. Http://

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