斜纹夜蛾成灾因子分析

On factors causing outbreak of Spodoptera litura(Fabricius)

利用性信息素诱捕、网罩隔离等方法,对斜纹夜蛾的种群动态消长规律进行研究,分析了斜纹夜蛾近10余年来连年大发生的原因。认为经济作物(特别是蔬菜)种植面积和设施栽培面积的迅猛增扩,增加了斜纹夜蛾取食和繁殖场所,为其在设施内越冬提供了可能性。发生期的提早,增加了虫源基数和发生世代,有利于斜纹夜蛾的发生量迅速增加。另外,夏季高温少雨、滥用农药杀伤天敌也是造成某些地区、有些作物斜纹夜蛾猖獗的原因之一。

The population dynamics and fluctuation of Spodoptera litura (Fabricius) were studied using sex pheromone trap and net cover, the reasons for outbreak of the pest in recent 10 years were searched. The authors believe that the increasing area of some economically important crops (mainly vegetable) and protected cultivation provide the suitable sites for feeding and overwinter of S.litura.The pest tends to occur earlier than before, which is helpful to buildup of big population by increasing in the original amount and generations in field. Other reasons for the pest outbreak may include high temperature and less rainfall in summer, and misuse of pesticides that might kill many natural enemies of this pest.