1山楂粉蝶核型多角体病毒的利用山楂粉蝶幼虫被核型多角体病毒感染后,初期行动迟缓,体色呈微黄褐色,死亡前以尾足或腹足攀住枝干,头部下垂或稍抬起。病死幼虫尸体薄脆,稍触即流出红褐色液体。感病幼虫1～3天食量下降16%,4～6天下降46.8%,7～9天下降82.4%,田间自然感病率37%～42%。 1 hawthorn butterfly nucleopolyhedrovirus use hawthorn butterfly larvae infected by nuclear polyhedrosis virus, the initial slow movement, body color was slightly brown, before death tail or gastropod to climb branches, head drooping or Slightly raised. Dead body larvae crisp, touch that is out of the red-brown liquid. The susceptible larvae decreased their food intake by 16% in 1-3 days, 46.8% in 4-6 days, 82.4% in 7-9 days and 37% -42% in field.