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春小麦乳熟期经常遭到二代粘虫危害,对小麦品质和千粒重都有很大影响,一般减产5～7％。粘虫幼虫分为六个龄期。三龄前,粘虫食量很小,栖息在植株下部落叶丛间。四龄后,食量骤增,集中危害上部叶片和麦穗。发生量较大时,可在一两天内将麦叶全部吃光,甚至将麦穗咬断。同时,它还能成群结队地向邻近的高粱、玉米等田块迁移并发生危害。幼虫三龄前对药剂很敏感,
Spring millet millet often suffer the second generation of armyworm hazards, wheat quality and grain weight have a great impact, the general reduction of 5 to 7%. Armyworm larvae are divided into six age groups. Three years ago, the armyworm appetite is very small, perched in the deciduous leaves of plants. After the fourth age, the appetite increases sharply, concentrating on the upper leaves and ears. Occurrence of large, can be a day or two of the wheat leaves eaten, and even bite the ears. At the same time, it can also move in droves to nearby fields such as sorghum and corn and cause harm. Larvae before the age of the drug is very sensitive,