Toxicities of five insecticides to Spodoptera frugiperda and their field efficacies against lepidopteran pests of maize in Sanya City, Hainan Province
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摘要: 为筛选对海南玉米田的鳞翅目害虫田间防效优良的新药剂，对溴虫氟苯双酰胺、环丙氟虫胺、氰氟虫腙、四氯虫酰胺和三氟甲吡醚等5种杀虫剂进行了草地贪夜蛾（Spodoptera frugiperda）幼虫的室内毒力测定和海南玉米田鳞翅目害虫的田间药效试验。室内毒力测定结果表明，5种杀虫剂对草地贪夜蛾2龄幼虫均具有较高的毒力，LC50介于0.011～0.092μg·cm-2。田间药效试验结果表明，对海南玉米田的鳞翅目害虫，施药后1 d,20%环丙氟虫胺悬浮剂表现出了较好的速效性，其防效为90.65%;10.5%三氟甲吡醚乳油、100 g·L-1溴虫氟苯双酰胺悬浮剂和22%氰氟虫腙悬浮剂也具有较好的防效，分别为84.02%、76.30%和57.67%，而10%四氯虫酰胺悬浮剂的速效性相对较差。施药后3 d,100 g·L-1溴虫氟苯双酰胺悬浮剂、20%环丙氟虫胺悬浮剂、10%四氯虫酰胺悬浮剂和10.5%三氟甲吡醚乳悬浮剂的防效均在89%以上，而22%氰氟虫腙悬浮剂的防效为74.44%。施药后7 d,5种杀虫剂仍具有良好的防治效果，防效都在85%以上。同时，田间药效试验结果还表明，20%环丙氟虫胺悬浮剂、22%氰氟虫腙悬浮剂和10.5%三氟甲吡醚乳油等3个处理在施药后不同时间的防效没有显著差异，而100 g·L-1溴虫氟苯双酰胺悬浮剂和10%四氯虫酰胺悬浮剂2个处理，在施药后1 d和3 d的防效有显著差异。结果表明，溴虫氟苯双酰胺、环丙氟虫胺、氰氟虫腙、四氯虫酰胺和三氟甲吡醚在海南对玉米田的鳞翅目害虫具有较好的防效，可用于海南玉米的鳞翅目害虫防治。Abstract: In order to screen new insecticides with excellent field control efficacy against lepidopteran pests of maize in Hainan, bioassay and field efficacy of broflanilide, cyproflanilide, metaflumizone, tetrachlorantraniliprole and pyridaly against Spodoptera frugiperda and other lepidopteran pests were studied in the laboratory and the corn field. The results showed that the five insecticides had high toxicities to the 2nd instar larvae of S. frugiperda, with the LC50 ranging from 0.011 to 0.092 μg·cm-2. The field efficacy test showed that cyproflanilide 20% SC showed good quick-acting effect at the 1st day after treatment and had a control efficacy of 90.65%. The control efficacies of pyridalyl 10.5% EC,broflanilide 100 g·L-1 SC and metaflumizone 22% SC were 84.02%, 76.30% and 57.67%, respectively, while the quickacting effect of tetrachlorantraniliprole 10% SC was relatively low. At the 3rd day after treatment, the control efficacies of broflanilide 100 g·L-1 SC, cyproflanilide 20% SC, tetrachlorantraniliprole 10% SC and pyridalyl 10.5% EC were all above 89%, while the control efficacy of metaflumizone 22% SC was 74.44%. At the 7th day after treatment, the five insecticides still had certain control efficacies which were higher than 85%. The results also showed that the control efficacies of cyproflanilide 20% SC, metaflumizone 22% SC and pyridalyl 10.5% EC were not significantly different at 1-7 days after treatment, while the control efficacies of broflanilide 100 g·L-1 SC and tetrachlorantraniliprole 10% SC were significantly different at the 1st and 3rd day after treatment. The results showed that broflanilide, cyproflanilide,metaflumizone, tetrachlorantraniliprole and pyridalyl had good control efficacies against lepidopteran pests of maize in Hainan, and could be used in the field control of lepidopteran pests of maize in Hainan.
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Key words:
- maize /
- lepidopteran pests /
- insecticides /
- toxicity /
- field efficacy /
- Hainan Province
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