Control of main insect pests in summer cabbage

Plutella xylostella physical control: Plutella xylostella has phototaxis, in the adult period, set up a black light every 10 mu, can trap and kill a large number of Plutella xylostella. Biological control: the use of bacterial insecticides such as Bt can make a large number of Plutella xylostella susceptible to death. Chemical control: at present, the agents and concentrations that can be used are 25% or 30% diazinon EC 1500 times, Yitaibao EC 2000 times, and carbazide EC 2000 times. Spray control should be carried out at the initial stage of occurrence, and should be sprayed on the back of the leaf or on the new leaf, once every 5-7 days, even 3-5 times. Physical control of beet armyworm: adults have strong phototaxis and can be trapped and killed by frequency vibrating insecticidal lamps in the field. Chemical control: 15% Anda suspending agent can be selected with a concentration of 2000 to 3000 times. The control should be controlled during the incubation period of larvae and the peak period of the first instar larvae. Spray should be uniform and thoughtful, and plant leaves should be fully sprayed on both sides. The insect has strong drug resistance, so pay attention to the rotation of drugs. Spodoptera exigua is omnivorous and gluttonous, so it should be evenly and thoughtfully applied, focusing on spraying the back and heart leaves. Beet armyworm has the habit of sleeping during the day and going out at night, so the control should be carried out in the evening. Water consumption should be increased to control beet armyworm in high temperature and dry season. Physical control of Spodoptera litura: frequency vibrating insecticidal lights, sex pheromones, black lights or sweet and sour pots can be used to trap and kill adults. Chemical control: application should be carried out in the evening. You can choose 5% fipronil 1500 × 2000 times liquid, 10% complete suspending agent 1000 × 1500 times liquid, 15% Anda suspension 5000 times liquid, 5% carbazem 1000 × 1500 times liquid spray to prevent and cure. Biological control of Pieris rapae: bacterial insecticides such as Bt and cyanobacteria No. 6 can be used, usually 500 to 800 times. Chemical control: 2.5% Baode EC 2000 times solution, 5% Regent suspension 2500 times solution and so on. It can also be prevented and treated with 20% or 25% thiazuron No. 1 or No. 3 glue suspension 500 × 1000 times. However, the effect of this kind of insecticide is slow, and it usually kills the pest when the age changes, so it should be sprayed earlier.