There are quite a lot of moths in the rice fields now. When should we spray pesticides to control the rice leaf roller?

After the mature larvae of the rice leaf roller (Cnaphalocrocis medinalis) emerge as moths, they go through a mating period of 1 to 2 days. Subsequently, they enter the peak egg-laying period within 3 to 6 days after emergence, and the egg stage typically lasts for 3 to 6 days. For the control of the rice leaf roller, pesticides are generally applied 7 to 10 days after the moth peak. During this period, it is exactly the stage from egg hatching to the peak of 1st-instar larvae, which ensures a relatively good control effect.