Reasonable selection of drugs is the key to improve the control effect of cotton bollworm. Among pyrethroid pesticides, dipyridamole, cypermethrin, beta-cypermethrin, Kung Fu, etc. It has a good control effect on cotton bollworm, and is mainly used to control the third generation cotton bollworm. However, cotton aphids have always been highly resistant to these pesticides in production, and their control is almost ineffective. When cotton aphid and cotton bollworm are mixed, pyrethroids are generally not used. Among organophosphorus pesticides, phoxim has a good control effect on cotton bollworm, but phoxim is easy to decompose when exposed to light and has short efficacy, so it should be used more. Monomonas has a wide insecticidal spectrum, which can control cotton bollworm, cotton aphid and red spider. , but the effect is average. When cotton bollworm occurs, monocrotophos alone is difficult to control its harm, so it should be mixed with other chemicals. Among carbamate pesticides, methomyl has a good control effect on cotton bollworm, which can kill larvae and eggs. Among the mixtures, Mianlingbao, Milingling and Guangxin 1 have significant control effects on cotton bollworm. Among biological pesticides, Bt preparation can be sprayed at the peak of incubation period, 2~3 days earlier than chemical pesticides, and the control effect on newly hatched larvae is higher.

In addition, do a good job in pest investigation and timely spraying control; Improve spraying method and control quality; Alternating use of pesticides and delaying the emergence of insect resistance are also key measures to control cotton bollworm.