论文部分内容阅读
粘虫在旅大地区一年发生三代,某些年份少数粘虫可以完成四代。第一代幼虫力害小麥及谷子幼苗,一般发生較輕,二代幼虫发生较重,为害谷子及玉米苗;三代幼虫常猖撅发生,为害谷叶、谷穗、玉米、高粱及水稻,往往造成严重損失;四代幼虫一般发生在杂草地及果园森林中,为害很輕。粘虫大发生的主要因素,取决于春季成虫基数、空气湿度和天敌数量,在粘虫开始繁殖以后,温度不是影响粘虫猖撅的主要因素。春季可用测蛾器誘蛾和小谷草把誘卵进行短期测报,夏季可用田間查卵并結合空气湿度和天敌数量,分析第二、三代幼虫发生时期和发生程度。
Mythimna separata occurs three generations a year in the Luda area, and in some years a small number of armyworms can complete four generations. The first generation of larvae power wheat and millet seedlings, the general occurrence of light, the second generation of larvae occurred heavier, damage to the millet and corn seedlings; third generation larvae often occur rampant, damage cereal leaves, ears, corn, sorghum and rice, often Causing serious losses; fourth-generation larvae generally occur in weeds and orchards in the forest, damage is very light. The main factor for the occurrence of armyworm to be large, depending on the number of adults in spring, the air humidity and the number of natural enemies, did not affect the prevalence of armyworms after the armyworm began to reproduce. In spring, the oviposition of the moths and the small weeds can be measured in short term. In the summer, ovum harvesting can be carried out in the field with the combination of air humidity and natural enemies to analyze the occurrence and occurrence of the second and third larvae.