三化螟发生期的预测和预报,在近年的药剂治螟工作中发挥了极其重要的作用,是指导适期用药的主要根据和确保治螟效果的必要措施。在逐步实现农业化学化的过程中,药剂治螟的规模日益扩展,组织准备和农药的分配调 The prediction and prediction of the occurrence of the stem borer, Chilo suppressalis, have played an extremely important role in the field of chemical treatment of Chilo suppressalis in recent years. They are the main basis for guiding the rational use of Chilo suppressalis and the necessary measures to ensure the culling effect. In the process of gradual realization of agrochemicalization, the scale of the medicinal herbaceous stems is expanding day by day, and the organization preparation and distribution of pesticides