油菜蚤跳甲药剂防治试验

Chemical control experiments on Psylliodes punctifrons on spring rape

选用6种药剂，采用拌种、拌种＋喷雾、喷雾3种施药方法，在甘肃省康乐县进行了双低春油菜田间油菜蚤跳甲防效比较试验，以油菜被害指数表示药剂的防治效果，选出适宜药剂与施药方法。结果表明：拌种处理中，毒死蜱被害指数最低（2～3叶期4．15％、4～5叶期20．38％、5～6叶期32．08％），氰戊·马拉松、甲维盐次之；拌种＋喷雾处理中，氰戊·马拉松（1．83％、15．84％、25．16％）、甲维盐（6．20％、29．2j％、29．24％）防效最佳，吡虫啉次之；喷雾处理中，氰戊·马拉松（5．24％、18．79％、29．17％）最佳，甲维盐、吡虫啉次之。氰戊·马拉松、辛硫磷、毒死蜱、甲维盐拌种、拌种＋喷雾，甲维盐喷雾将最终死苗率控制在5％以内，大田示范试验中被害指数控制在40％以内，有效控制了对油菜的为害。由此，可以用毒死蜱、氰戊·马拉松、甲维盐、吡虫啉替代高毒农药甲拌磷防治油菜蚤跳甲。其中吡虫啉、甲维盐适宜喷雾，毒死蜱适宜拌种，氰戊·马拉松拌种或喷雾均适宜。

Experiments were conducted to compare the control effects of Psylliodes punctifrons Baly by 6 pesticides and three methods （seed dressing, seed dressing＋spraying, spraying） in double-low rape fields in Kangle County of Gansu Province. The results showed that, with seed dressing, chlorpyrifos produced the lowest damage index, followed by fenvalerate-malathion and emamectin benzoate-chlorfenapyr. Through seed dressing ＋ spra- ying, fenvalerate-malathion, and emamectin benzoate-chlorfenapyr had the best effects, followed by imidacloprid. Through spraying, fenvalerate-malathion was the best, followed by emamectin benzoate-chlorfenapyr and imidacloprid. Fenvalerate-malathion, phoxim, chlorpyrifos and emamectin benzoate-chlorfenapyr, through seed dressing and seed dressing＋spraying, and emamectin benzoate-chlorfenapyr through spraying, brought the final dead seedling rate in the range of 5%, and the damage index in the range of 40% in the field experimental demonstration. These results suggested that chlorpyrifos, fenvalerate-malathion, emamectin benzoate-chlorfenapyr and imidacloprid could replace phorate, in which imidacloprid and emamectin benzoate-chlorfenapyr were suitable for spraying, chlorpyrifos for seed dressing, and fenvalerate-malathion for both spraying and seed dressing.