0.3%印楝素水剂防治十字花科蔬菜小菜蛾田间试验

为了明确0.3%印楝素水剂不同用药量对防治小菜蛾的防治效果,开展了该药剂防治田间甘蓝小菜蛾效果试验。结果表明,在7.2~10.8g(a.i.)/hm2用量下,各药剂处理10d平均防治效果均高于90%;在相同用药量情况下,水剂剂型的防效与乳油剂型无显著差异。建议在防治小菜蛾时采用0.3%印楝素水剂的使用剂量为9.0~10.8g(a.i.)/hm2。

Field Experiment of 0.3% Azadiracht in EW Controlling Plutella Xylostella of Cruciferous Vegeta-bles

In order to evaluate the effects of different dosages on the prevention activity of Plutella xylostel?la,0.3% Azadirachtin EW were used to protect Cabbage from Plutella xylostella in fields, and comparison of activity with EC was also made. The results showed that under the dosage of 7.2~10.8g(a.i.)/hm2, the prevention activity could reach over 90% on each treatment after 10 days over 0.3% Azadirachtin EW, and no significant difference of prevention activity was observed between EC and EW under same dosage of Azadirachtin. In the application of 0.3% Azadirachtin EW to protect Cabbage from Plutella xylostella in fields,the dosage of Azadirachtin were suggested to be 9~10.8g(a.i.)/hm2.