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菜蛾Plutella maculioennis Curtis是一种世界性蔬菜害虫,国内普遍发生。银川平原灌区每年发生6～7代,尤以第二代发生期长,发生量大,对甘兰、小白菜等十字花科蔬菜造成损失较大。菜蛾为害甘兰的防治指标报道较多。苏联提出在甘兰轮生期,有虫株率为10％时,防治指标为2～5头/株;湖南长沙报道菜蛾为害甘兰防治指标为1～2头/株。菜蛾为害小白菜的防治指标国内尚无报道。我们于1988～1989年在宁夏农学院教学农场对第二
Plutella maculioennis Curtis is a worldwide vegetable pest that is common in China. Yinchuan Plain Irrigation occurs 6 to 7 generations a year, especially in the second generation of a long period of occurrence, the occurrence of large, cabbage and cabbage and other cruciferous vegetables caused greater damage. Plutella xylostella prevention and treatment indicators reported more. The Soviet Union proposed that during the rotation period of Kanyang, the control index was 2 ~ 5 heads / plant when the strain rate was 10%. The control index of cabbage moths for cabbage was 1 ~ 2 heads / plant in Changsha, Hunan Province. Cabbage moth cabbage prevention and control indicators have not been reported. We from 1988 to 1989 in Ningxia Agricultural College teaching farm on the second