绿之园4号对黄瓜上白粉虱的防效试验

用生物制剂绿之园4号对黄瓜上白粉虱进行防治试验。试验结果表明,用绿之园4号300倍液在晴天的日出前露水未干时对作物叶面叶背进行喷施,效果非常显著;用药前黄瓜叶片上白粉虱的虫口密度为233×10~4头/cm~2药后1 d防效为100%,药后10 d防效仍在70%以上。

Effect of Lvzhiyuan No.4 in Preventing Cucumber Whitefly

According to the serious whitefly endemic situation happened in many provinces and area in china and bad ef- fect of previous control agent,we used biological agent of Lvzhiyuan No.4 to do the control experiment,the experimental crops were mainly based on cucumbers,with melon,pepper,eggplant and tomato.The results showed that the effect was extremely remarkable when positive-reverse sprayed used 300 times liquid of Lvzhiyuan No.4 before the sunrise;the pop- ulation density on cucumber leaves was 233 heads/dm~2 at pre-administration,after using Lvzhiyuan No.4 for I day the population density decreased to 0,the control effect was 100%,after 10 days,the effect was still above 70%,the maxi- mum control effect on the other crops were also above 95%.