目前,全国水稻品种和种植方式没有发生根本改变,适宜于“两迁”害虫迁入为害;而境外存在一定“两迁”害虫虫源,随着当地水稻逐渐成熟收割,将有大量虫源迁入我国。综合水稻生长情况、境外虫源和气象条件,结合当前“两迁”害虫发生现状,预计早稻、中稻前期“两迁”害虫发生形势仍 At present, there has been no fundamental change in the rice varieties and planting methods throughout the country, which is suitable for the peasants moving into the “two migration” pests; while there are some insect pest sources outside the country, and as the local rice gradually matures and harvested, there will be A large number of insects moved into China. Combining with the growth of rice, the sources of external and meteorological conditions outside the country, combined with the current status of pest occurrences in both "