What are the reasons for the occurrence of corn borer?

What are the reasons for the occurrence of corn borer? Please introduce the reasons for the occurrence of corn borer as follows: (1) population base: the population base of the previous generation is an important factor affecting the severity of corn borer damage. The number of insect population is large, which often causes serious damage under suitable environmental conditions. (2) temperature and humidity: corn borer is suitable for growth and development under the condition of high temperature and high humidity. The suitable temperature for the growth and development of each insect state is 16-30 ℃, and the relative humidity is more than 60%. Corn borer mainly occurs from June to September, and the temperature is suitable. Therefore, the change in the number of corn borer depends on humidity and Rain Water. (3) Maize varieties: the victims vary greatly with different maize varieties. There is a kind of anti-borer substance Dingbu in corn tissue. Adults lay eggs on corn varieties with high Dingbu content, and the mortality of hatched larvae is very high. In addition, due to the different tissue morphology of corn, adult spawning can be avoided to reduce borer damage, such as long and dense hair on the leaf stem, the borer damage is very light. Therefore, the population number and corn damage degree of corn borer are different with different corn varieties. (4) Natural enemies: there are many kinds of natural enemies of corn borer, but Trichogramma has great inhibitory effect on corn borer. Trichogramma parasites in the eggs of corn borer, so that the eggs can not hatch normally, or the hatched larvae can not grow normally, which can play a certain role in suppressing the borer. Click to get more Pesticide Application techniques click to get more Pesticide Application techniques Click to get more Maize planting techniques