1979年在赣榆县初步找出了两种预报纵卷叶螟迁入主峰期的方法,一种是以2、3月份平均气温和5月下旬雨日数为指标,用分档统计法进行预测;一种是用3、4月份小地老虎迁入主峰期与7月份稻纵卷叶螟迁入主峰期的关系,作成一元直线回归公式进行预测.经1980年检验,这两种方法的预报结果都与实际发生情况相符. In 1979, Ganyu County initially identified two methods of forecasting the main stage of the movement of Cnaphalocrocis medinalis. One is based on the average monthly temperature in February and March and the number of rainy days in late May as an index, ; One is to use the linear regression formula to forecast the relationship between the main peak of migration of Landrace in March and April and the main peak of rice leaf roller in July, and the forecast of the two methods by 1980 test The results are consistent with the actual situation.