多年观察研究证实,二代粘虫在山西省忻定盆地的发生程度,取决于外地虫源基数、幼龄幼虫的死亡率,同时与气候条件关系十分密切,所以粘虫的发生密度年际间变化很大。年年防治,费工费药,很不经济;稍有疏忽,又易暴发成灾。因此,确定科学的防治指标,减少防治次数,把粘虫的发生控制在经济允许的范围之内,已成重要课 Years of observational studies have confirmed that the occurrence of second-generation armyworms in the Xinding Basin of Shanxi Province depends on the number of insect-borne baselines and the mortality of juvenile larvae in the field and is closely related to climatic conditions. Therefore, dramatic change. Prevention and control every year, labor costs medicine, very uneconomical; a little negligence, but also prone to outbreaks. Therefore, it has become an important lesson to identify scientific prevention and control targets, reduce the number of prevention and control and control the occurrence of armyworm within the range allowed by the economy