Reasonable selection of pesticides is the key to improving the control of cotton bollworms. In recent years, there are many types of pesticides used in cotton fields, and there are hundreds of insecticides and formulations alone. These drugs have different control targets and effects, and the prices are very different. They must be selected at the time of purchase and use. In the chrysanthemum lipid pesticides, the effects of enemy killing, hydrochlorothiazide, high-efficient hydrochlorohydrin, and kung fu on the cotton bollworm are better, but cotton aphid has been highly resistant to this type of pesticide and used for control. Locusts are almost ineffective. Therefore, in the case of a mixed aphid and cotton bollworm, generally do not choose chrysanthemum pesticides. In production, chrysanthemum pesticides are mainly used for the third generation of cotton bollworm. Among organophosphorous pesticides, phoxim and dichlorvos have good control effects on bollworms, but phoxim can be easily decomposed by light and dichlorvos are easily volatilized. The efficacy period is very short, and the number of application times should be increased. Methamidophos has good effects on young instar larvae, especially in the event of major outbreaks, as long as the appropriate period of time to control the spraying, the control effect is extremely obvious. Monocrotophos broad-spectrum insecticide is effective against Helicoverpa armigera, Aphis gossypii, Red spider, etc., but the effect is general. It is difficult to effectively control the damage of monocrotophos when bollworms occur. Methyl 1605 is more effective than monocrotophos in preventing and controlling cotton bollworm, but it is a highly toxic pesticide and can easily cause pesticide poisoning. When using it, special attention should be paid to protection and avoid spraying at hot noon. In urethane pesticides, methomyl (also known as Wanling) has a good control effect against bollworm, not only killing young instar larvae, but also effective in killing eggs. Among the compounding agents, the prevention and control of cotton bollworm by cotton bolls, de-lingling and Xinguang No. 1 were more prominent. Among biopesticides, Bt preparations are widely used in large-scale cotton areas in recent years. They are suitable for spraying during the incubation period, generally 2-3 days ahead of spraying chemical pesticides, and have a high control effect on newly hatched larvae. In addition, the investigation of insect pests, the timely spraying of pesticides, the improvement of spraying methods, and the improvement of the quality of prevention and control; the alternative use of pesticides and the reduction of insect resistance are key to improving the prevention of cotton bollworms.
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