论文部分内容阅读
甘兰夜蛾(Mamestra brassicae(L.))属鳞翅目、夜蛾科。俗称甘兰夜盗虫。是杂食性害虫,主要危害甘兰作物,其次危害十字花科各种蔬菜,另外对茄子、甜菜、瓜类、豆类等百余种植物均可危害。我省一年发生2～3代,我市6月～9月危害最大,个别地块暴发成灾。1981年6、7月份,在我所60亩大白菜制种田中,百株虫量达700头以上,造成种子减产25～33%,影响产值90～120元/亩。1980年8月份在我市北陵公社大含七队的10亩中生甘兰地里,甘兰夜蛾发生较重,百株虫量达200头以上。在虫情调查中发现幼虫自然罹病死亡较多。经采集病死虫于室内镜检,患病幼虫的
Mulastra brassicae (L.) is a Lepidoptera, Noctuidae. Commonly known as cabbage night stealing insects. Is omnivorous pests, the main hazard to sweet orchid crops, followed by endangering cruciferous vegetables, while the eggplant, sugar beet, melons, beans and other plants can be harmful to hundreds of species. 2 to 3 generations a year in our province, the city from June to September the greatest harm, individual massif outbreaks. In June and July 1981, in our 60-acre Chinese cabbage farming system, the number of hundred insects reached over 700, resulting in 25-33% reduction in seed yield, which affected the output value of 90-120 yuan / mu. In 1980 August in the city of Beiling commune containing seven acres of Zhongsheng Brandou, the occurrence of H. armigera heavier, hundreds of insect population of 200 or more. In the survey of insects, larvae found more natural deaths. After the acquisition of diseased insects in the room microscopic examination, diseased larvae