14种杀虫剂对草地贪夜蛾的杀卵活性

Ovicidal activity of fourteen insecticides against the fall armyworm, Spodoptera frugiperda

为筛选对草地贪夜蛾卵具有活性的杀虫剂,为防治卵期草地贪夜蛾提供数据支撑。采用浸渍法,室内测定了14种杀虫剂的杀卵活性。结果表明:14种杀虫剂均具有一定的杀卵活性。在100 mg/L浓度下,苯氧威、灭多威和吡丙醚的杀卵活性最强,显著高于其余药剂,且能够完全抑制卵的孵化。甲氨基阿维菌素苯甲酸盐(甲维盐)、氟虫脲、硫双威、氟铃脲、除虫脲和溴氰虫酰胺的杀卵效果无显著差异(P>0.05),杀卵活性在71.67%~90.00%之间。在10 mg/L浓度下,苯氧威和吡丙醚杀卵活性最高,可完全抑制卵的孵化。甲维盐、除虫脲和溴氰虫酰胺也表现出较好的杀卵效果,杀卵活性介于55%~66.67%之间,以上药剂均可作为草地贪夜蛾的杀卵剂轮换使用。值得注意的是,茚虫威是一种对鳞翅目害虫具有优异杀虫活性的新型杀虫剂,且对环境友好。其在100 mg/L和10 mg/L处理浓度下对草地贪夜蛾杀卵活性为52.38%±6.25%和36.67%±6.67%。甲氧虫酰肼在两个处理浓度下的杀卵活性均低于30%,不推荐作为草地贪夜蛾的杀卵剂。上述结果可为草地贪夜蛾的有效防治提供参考。

The aim of this experiment was to determine the ovicidal activity of 14 insecticides against Spodoptera frugiperda. It can provide basis for controlling S. frugiperda by spraying insecticides at egg stage. In this paper, dipping method was used to determine the ovicidal activity of 14 insecticides in the laboratory. The results showed that all the 14 insecticides had certain ovicidal activity. Among them, fenoxycarb methomyl and pyriproxyfen had the strongest ovicidal activity at 100 mg/L, which could completely inhibit the hatching of eggs. Meanwhile, the ovicidal activities of emamectin benzoate, flufenoxuron, thiodicarb, hexaflumuron, diflubenzuron, cyantraniliprole showed no significant difference(P>0.05), with the corrected mortality of eggs ranged from 71.67% to 90.00%. At the concentration of 10 mg/L, fenoxycarb and pyriproxyfen showed the highest ovicidal activity, which completely inhibited egg hatching. Meanwhile, the emamectin benzoate, diflubenzuron and cyantraniliprole also showed higher ovicidal activity, ranging from 55% to 66.67%. The above insecticides could be used as ovicides. It is worth noting that indoxacarb is a new insecticide with excellent insecticidal activity against lepidoptera pests and is environmentally friendly. And it also showed a ovicidal activity of 52.38%±6.25% and 36.67%±6.67% at the concentration of 100 mg/L and 10 mg/L, respectively. While the methoxyfenozide showed a ovicidal activity of less than 30% at both concentrations, and was not recommended as an ovicide. These results will provide technical guidance for chemical control of this insect pest.