防治沟金针虫的农药复配增效配方筛选

为了筛选对地下害虫金针虫具有增效作用的复配药剂组合,采用浸渍法测定了各复配组合对沟金针虫3龄幼虫的联合毒力,通过共毒因子法筛选出共毒因子大于20复配组合,然后进一步细化配比,利用共毒系数法筛选出共毒系数大于120的最佳复配组合。其中具有增效作用的配比有28组。氯虫苯甲酰胺与毒死蜱、氟虫腈、硫双威、噻虫胺、联苯菊酯、噻虫嗪、高效氯氟氰菊酯按2:1、3:1、15:8、15:2、3:4、1:2、3:11的比例进行复配时效果最显著,共毒系数分别为178.41、185.44、208.10、155.16、149.55、138.98、309.22。高效氯氟氰菊酯与噻虫嗪按11:2的比例进行复配时效果最显著,共毒系数为198.45。联苯菊酯与硫双威、噻虫胺按1:2、1:5的比例进行复配时效果最显著,共毒系数分别为215.69、337.94.

Selection on Synergetic Ratio of Combined Insecticides to Pleonomus canaliculatus (Faldermann)

To screen out the combination of insecticide complex agents with synergistic effect on the underground pest Pleonomus canaliculatus, the toxicant force of each compound combination on the 3rd instar larvae of the Pleonomus canaliculatus was determined by the dipping method. The co-toxicity factor method was used to select the combination with the co-toxic factor greater than 20, and then the ratio was further refined, and the optimal compounding combination with a co-toxicity coefficient greater than 120 was screened by the co-toxicity coefficient method, among them, 28 groups had synergistic effect. The results showed that: chlorantraniliprole with chlorpyrifos, fipronil, thiodicarb, clothianidin, bifenthrin, thiame-thoxam and lambdacyhalothrin, with the ratio of 2:1, 3:1, 15:8, 15:2, 3:4, 1:2 and 3:11, respectively, showed significant synergistic effect, and the co-toxicity coefficient (CTC) was 178.41, 185.44, 208.10, 155.16, 149.55, 138.98 and 309.22, respectively; the most significant effect was observed when the mixture of lambda-cyhalo-thrin and thiamethoxam was at a ratio of 11:2, and the co- toxicity coefficient (CTC) was 198.45. The effect of bifenthrin combined with thiodicarb and clothianidin at a ratio of 1:2 and 1:5 is significant with the co-toxicity coefficient (CTC) of 215.69 and 337.94, respectively.