烟蚜茧蜂防治烟蚜的散放次数及其田间防治效果研究

对烟蚜茧蜂防治烟蚜的散放次数研究结果表明，在初始蚜量较低的条件下，采用逐次（三次以上）放蜂的方法散放烟蚜茧蜂防治烟蚜，可有效地控制烟蚜种群的增长。对放蜂防治田、常规施药田和不施药烟田的烟蚜数量调查结果表明，散放烟蚜茧蜂防治烟蚜的田间防治效果明显，与常规施药田的防治效果相当。对放蜂区和常规施药防治区内烟农施用杀虫剂情况的调查表明，在放蜂区施用杀虫剂的平均次数为1.83次，而常规施药防治区为3.05次，放蜂区的施药次数比常规防治区减少40%。

The releasing times of controling aphids by using Aphidius gifuensis and its control effect in the field

The research on the times of releasing Aphidius gifuensis control aphids has showed that: the successive releasing Aphidius gifuensis can control the growth rate of aphid effectively when the outset aphids is lower. The survey indicate: the control effect of releasing Aphidius gifuensis is significant ,equal employing agricultural chemicals in the field. The survey about employing insecticide in zone of releasing Aphidius gifuensis and convention field show that: Agricultural chemicals employment number of times reduce 1.22 and average employment amount reduced 40%。