一、前言粘虫[Mythimna separata(Walker)]是我国粮食作物主要害虫之一,全国大部粮食产区年年均有发生和为害,以致造成不同程度的减产。粘虫发生和为害受多种因素的影响,其中除虫源基数外,主要受气侯条件的制约。我国南北气候差异悬殊,导致粘虫分布和发生情况均十分复杂。每年随着气候变化,春季粘虫从南向北迁飞为害,秋季则从北向南迁飞。为进一步摸清各地粘虫主要发生代次的虫源界线问题,及其迁飞规律,并确定西半部地区粘虫越冬界线,现根据粘虫对气候条件的要求,作出粘虫气候区划,同时结合各地部分调查资料对区划进行验证,以供预测预报时参考。 I. INTRODUCTION Mythimna separata (Walker) is one of the major pests of food crops in our country. Most of the grain producing areas in the country have occurred and harmed each year, resulting in different degrees of yield reduction. The occurrence and damage of armyworm are affected by many factors, except for the base of insects, which is mainly controlled by the climatic conditions. The disparity between the climate in North and South China caused the distribution and occurrence of armyworm to be very complicated. Every year, as the climate changes, spring armyworms migrate from south to north and fall from north to south in autumn. In order to further understand the main source of the occurrence of armyworm in different areas, and the rules of its migration, and to determine the overwintering boundary of the armyworms in the western half area, the climate of the armyworm is divided according to the climatic requirements of armyworm. At the same time, some regional survey data are used to verify the zoning for reference when forecasting.