论文部分内容阅读
油菜茎象甲是一种危害油菜茎部的钻蛀性害虫,属鞘翅目象甲科,别名油菜象鼻虫,是油菜生产上的重要害虫之一,分布于我国各地油菜产区。近些年来旱地油菜茎象甲的危害有逐年加重之势,主要以幼虫在茎中钻蛀危害,成虫亦可危害叶片和茎皮,大发生年份茎受害率平均为70%左右,除危害油菜外,还可危害十字花科的蔬菜作物等,在生产上常被忽视。据调查,在严重发生时,油菜的减产率一般为25%~40%,特殊危害年份可导致大面积油菜倒伏绝收。
Rape stem is a kind of borer pest that endangers the stem of rape. Coleoptera, such as Coleoptera, is an important pest in rapeseed production. It is distributed in the rapeseed area around China. In recent years, the damage of dry weed rape stem weevil has increased year by year, the main larvae drowning in the stem damage, adults can also endanger the leaves and bark, the occurrence of large annual stem damage rate of about 70% on average, in addition to harm rape In addition, it can also endanger cruciferous vegetable crops, etc., which are often overlooked in production. According to the survey, in the case of serious occurrence, the yield reduction rate of rapeseed is generally 25% ~ 40%, and the year of special harm can cause the large-area rapeseed to lose its yield.