摘要
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 was applied to determine the yield loss of spring cabbage damaged by Pieris rapae L , and the life table , exclusion index of population control(EIPC) were also used to evaluate the effect of natural enemies on Pieris rapae larvae. Moreover, the action threshold model including natural enemies effects , and the functional equations reflecting the relationship between the larvae density and the yield losses of cabbage at the different growth stages were also established. The results showed that, the yields reduction of cabbage were mainly caused by the damage of pest at the cupping stage ; The predatory natural enemies of the larvae had more control effects on the Pieris rapae population , the EIPC values was 4 7107. Based on the yield loss models and the data from the life table for P.rapae ,the model of action threshold (AT) was also presented. According to AT formula, the AT of P. rapae at the different growth stages was calculated to be 3 4 5th instar larvae or 7 69 3rd 4th larvae or 14 13 1st 2nd instar larvae per plant at cupping stage , 6 93 5th instar larvae , 12 23 3rd 4th instar larvae or 29 34 1st 2nd instar larvae per plant at mature stage.
出处
《上海交通大学学报（农业科学版）》
2002年第4期312-316,共5页
Journal of Shanghai Jiaotong University(Agricultural Science)
基金
"十五"国家重点科技攻关资助项目 (2 0 0 1BA5 0 3 B0 5 )
关键词
菜青虫
春甘蓝
生育期
产量
经济阈值
天敌
防治指标
均匀设计
Pieris rapae L
yields loss of cabbage
effectiveness of natural enemies
action threshold
uniform design
