I. Agricultural control Increase the area of ​​autumn-turning winter irrigation, promote the development of innocent cotton fields to reduce the amount of overwintering cotton bollworm, implement artificial insect-repelling measures, promptly eradicate cockroaches after wheat harvest, increase the planting area of ​​multi-seedling corn, and effectively suppress the generation of cotton bollworms The number of insects.
Second, the physical control mainly to plant corn traps, installation of high-pressure mercury lamp, the use of Yang Zhi to kill and spray phosphorus moth-based. More than 80% of the planted area of ​​corn traps in cotton fields was developed. The use of corn to trap eggs of the bollworm and control them in a centralized manner greatly reduced the amount of eggs laid in the cotton fields. High-pressure mercury lamps are installed in the cotton field, and every 500 meters is set to perform light trapping. During the eutrophic period of each generation of cotton bollworm, a Yangzhi stick was placed on every 1334 square meters. During the oviposition period of adult H. armigera, the planned deployment and spraying of foliar phosphorus on the leaves were combined with the high-beeping period of the bollworm, which effectively reduced the actual egg production in the cotton field.
Third, chemical control Chemical control is a rapid emergency method, in the selection and use of pesticides to be scientific prevention, especially in the middle and late May to mid-August to focus on the coordination of cotton bollworm and cotton aphid prevention and control.
1. Strict prevention and control indicators A generation of 100 larvae have 5 to 10 larvae or eggs of 20 to 30 granules, second generation 100 larvae have 15 to 20 larvae, and three generations of 100 larvae have 25 to 30 larvae.
2. The best application period and methods to do a good job in the investigation of cotton field pests, the principle of prevention: the peak of drugs to fight eggs, governance before the third instar. The first generation eggs of cotton bollworm were prolific in the upper leaves and the front of the leaves on the top of the cotton plants. The top spraying method should be adopted when spraying, and the liquid spray should be concentrated on the top leaves. The spawning sites of the second and third generations of cotton bollworms were scattered. , increase the amount of liquid medicine, evenly wash the cotton plant once again, it is not suitable for the prevention, the implementation of a dot or ribbon rotation drug.
3. Use biological pesticides such as Sadan or biological agents to protect natural enemies.
4. Preventing resistance to Helicoverpa armigera During the whole year of cotton field control, one type of pharmaceutical agent is used only once. Sadan and endosulfan can be used alternately.
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