松毛虫越冬期是一年中防治最有利时期,因为这时虫群分布集中,虫态整齐,抵抗力弱,农闲有劳力,林间草矮好施工,并有利保护天敌。所以全年狠抓越冬代,越冬代狠抓越冬期,是合理防治的一项很重要的措施。但以往大部份防治工作,多在虫群结束越冬以后,越冬期防治还缺乏经验。自中国科学院动 The wintering period of the pine caterpillars is the most favorable period for the prevention and control of the year, because at this time the distribution of the swarm is concentrated, the insect states are neat, the weaker the resistance, the less productive labor, the less suitable for the construction, and the favorable protection of the natural enemies. Therefore, pay close attention to wintering throughout the year, pay close attention to winter wintering period, is a reasonable prevention and control of a very important measure. However, most of the prevention and control work in the past, mostly in the overwintering of the end of the swarm, overwintering prevention and treatment is still inexperienced. Since the Chinese Academy of Sciences move