不同农药对油菜跳甲和茎象甲的防治效果

以"青杂305"油菜为试材,选用吡虫啉、氟虫腈、毒死蜱、辛硫磷、三唑磷5种农药,采用拌种法防治油菜跳甲和茎象甲("两甲"),以期筛选出高效、低毒、低残留的拌种农药。结果表明:当毒死蜱浓度为推荐剂量的0.5倍时和吡虫啉浓度为推荐剂量时,油菜平均被害指数最低,分别为0.09和0.07,对跳甲的防效最好;吡虫啉随着处理浓度的增加对茎象甲的防效提高,辛硫磷的处理浓度为推荐剂量时防效最好,毒死蜱的处理浓度为推荐剂量的0.5倍时,防效基本同推荐剂量;说明吡虫啉、毒死蜱和辛硫磷对油菜"两甲"有较好的防效。

Test of Control Efficiency to Phyllotreta striolata (Fabricius) and Ceuthorrhynchus as per Roel with Different Insecticides

Rape variety’Qingza 305’ was used as material for test of Phyllotreta striolata and Ceuthorrhynchus asper with 5 kinds of insecticide including imidacloprid,fipronil,Chlopyrifos,phoxim and triazophos to select seed treating insecticide of high efficiency,low toxicity and low residue.The results showed that the average disease rate was lowest as respectively 0.09 and 0.07 when content of Chlopyrifos was 0.5 times of recommended dosage and imidaclopri at recommended dosage and reached best control for Phyllotreta striolata.The efficiency of imidacloprid was enhanced with content increase on Ceuthorrhynchus asper control.Phoxim was most efficient with recommended dosage.The efficiency of Chlopyrifos was almost the same with recommended dosage and half of it.The results suggested that Chlopyrifos and phoxim had relatively better control over Phyllotreta striolata and Ceuthorrhynchus asper.