16%四螨·哒螨灵WP防治苹果树红蜘蛛药效试验

Efficacy Trials on Clofentezine+Pyridaben 16% WP Against Tetranychus viennensis in Apple

为了研究16%四螨·哒螨灵WP防治苹果树红蜘蛛的应用技术,进行了田间药效试验。结果表明:16%四螨·哒螨灵WP 89～114 mg/kg,药后2,7,10 d对苹果树红蜘蛛的防效分别为89.42%～94.25%、93.15%～95.81%、95.71%～96.13%,略优于单剂15%哒螨灵EC的防效92.44%、81.06%、89.70%,显著优于单剂20%四螨嗪SC的防效62.03%、75.00%、76.65%。在苹果树红蜘蛛发生期,采用16%四螨.哒螨灵WP 89～114 mg/kg喷雾防治,能有效控制其危害。

In order to study the application technologies of clofentezine ＋ pyridaben 16% WP against Tetranychus viennensis in apple, field trials were carried out. The results showed that the field control efficacies of clofentezine ＋pyridaben 16% WP were 89.42%-94.25%, 93.15%-95.81% and 95.71%-96.13% at the active ingredient dosages of 89-114 mg/kg on the 2rd, 7th and 10th days after spraying, respectively. The control efficacies of the mixture were slightly better than pyridaben 15%EC and significantly better than clofentezine 20%SC. The efficacies of pyridaben 15%EC at 43 mg/kg were 92.44%, 81.06%and 89.70%, and the efficacies of clofentexine 20%SC at 83 mg/kg were 62.03%, 75.00%and 76.65%on the 2rd, 7th and 10th days after spraying, respectively. Tetranychus viennensis in apple could be controlled by spraying clofentezine＋pyridaben 16%WP at the dosages of 89-114 mg/kg.