Appropriate application time is the key to improve the control effect of cotton bollworm. The application of pesticides increases the number of prevention and treatment at a too early time, increases the cost of prevention and control, and the second application of pesticide is often too late, which affects the control effect. The application of pesticide is late, and the control effect is not Good, easy to cause harm. At present, when we determine the period of application of cotton bollworm, we often refer to prevention and control indicators. We should pay attention to the following issues during implementation: (1) The formulation of prevention and control indicators is based on the damage caused by larvae damage. For the convenience of grasping in advance, it should be dismantled into eggs of H. armigera as an indicator for prevention and control. Since most agents do not kill eggs, there should be 3-4 from eggs to larvae. The time difference of the day. (2) Three generations of cotton bollworms are spawning during the spawning period. The cotton plants are tall, the tops do not hit, and the ovipositing parts are scattered. It is difficult to accurately investigate. (3) The hatching rate of the eggs produced by the early generations of the four generations of cotton bollworms differed greatly from that of the eggs of the later stages. The main hazard was the larvae hatched by the eggs in August. This is the key prevention and control target. By the beginning of September, because of the adverse effects of temperature on the hatching of eggs and the survival of larvae, it will generally not cause great harm. (4) According to many years of experience, the second-generation bollworm has an abrupt increase in the amount of eggs laid in the cotton field. You can go to the cotton field every morning to see it again. When you see a sudden increase in the number of new eggs in the field (the amount of eggs on the day is 2-3 times the amount of eggs in the previous day), you can use it as a surge period. The second application should be based on the residual period of the drug. (Hubei Dangyang Agricultural 110 Service Center) Surface Active Agents,Powder Silicone Adjuvant,Super Spreader,Adjuvant Agriculture Jiangxi Tiansheng New Materials Co.,Ltd , https://www.jxtsxcl.com