应用均匀设计方法 ,测定了菜青虫连续为害春甘蓝结球始期和菜球充实期造成的产量损失 ,并应用生命表方法评价了春甘蓝上菜青虫天敌的作用 ,建立了包括甘蓝生育期和菜青虫种群密度在内的产量损失模型和包含各类天敌作用的防治指标模型。结果表明 ,产量损失主要是由甘蓝结球始期的虫害造成 ,捕食性天敌对菜青虫控制作用最大 ,其排除作用控制指数为 4.71 0 7。根据防治指标模型 ,可求出甘蓝结球始期和菜球充实期以 1～ 2龄幼虫、3～ 4龄幼虫、5龄幼虫为依据的防治指标 ,分别为每株 1 4.1 3头、7.69头、3 .44头 (结球始期 ) ,2 9.3 4头、1 2 .2 6头和 6.93头 (菜球充实期 )。 The uniform design method was used to determine the yield loss caused by cabbage caterpillars during the initial and early stage of cabbage ball calamity. The life table method was used to evaluate the effect of cabbage insect caterpillar on natural enemies. The population loss model of population density of caterpillar and the prevention and control index model containing the function of various natural enemies. The results showed that the yield loss was mainly caused by insect pests at the early stage of cabbage node formation. Predation of natural enemies had the greatest control effect on the parasitoid larvae, with the control index of 4.71 0 7. According to the control index model, the control indexes based on the first to the second instar larvae, the third to the fourth instar larvae and the fifth instar larvae can be obtained at the beginning of the cabbage balling stage and the filling stage of the cabbage ball, which are 1 4.1 3 and 7.69 , 3.44 heads (the beginning of the knot), 2 9.34 heads, 12.26 heads and 6.93 heads (the period of full ballon).