Increased Efficacy of Entomopathogenic Nematode-Insecticide Combinations Against Holotrichia oblita (Coleoptera: Scarabaeidae)
Increased Efficacy of Entomopathogenic Nematode-Insecticide Combinations Against Holotrichia oblita (Coleoptera: Scarabaeidae)
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DOI：
10.1093/jee/tow241
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发表时间：
2017-02-01
影响因子：
2.2
通讯作者：
Han, R.
中科院分区：
文献类型：
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作者：
Guo, W.;Yan, X.;Han, R.
研究了昆虫病原线虫长隐线虫X-7和异habditis bacteriophora H06与不同剂量氯虫腈、双氟虫腈和吡虫啉联合防治花生田白蛴螬（鞘翅目：金甲科）的效果。实验结果表明，这两种药剂对二龄黑纹夜蛾幼虫具有增效或加性作用，其致死率高于单用或单用。嗜菌异habditis - chlorantranilprole和嗜菌异habditis -imidacloprid对幼虫有协同作用。当较高浓度的杀虫剂与线虫混合使用时，发现协同效应更强。在花生田中，长叶螟-吡虫啉、嗜菌螟-吡虫啉、嗜菌螟-氯虫啉对幼虫也有协同作用。与毒死蜱处理相比，这三种线虫-杀虫剂组合对蛴螬幼虫的减少百分比相似，对豆科植物的伤害百分比更低。成本效益分析表明，每株5.0 × 10(3)条感染幼虫(等于7.5 × 10（8) ljha(-1)）与推荐浓度的吡虫啉联合使用，是从业者管理花生生产中白蛴螬的实用策略。
Combinations of entomopathogenic nematodes Steinernema longicaudum X-7 and Heterorhabditis bacteriophora H06 with chlorantraniliprole, diflubenzuron, and imidacloprid insecticides at different rates for the control of the white grub, Holotrichia oblita Faldermann (Coleoptera: Scarabaeidae), were evaluated both in the laboratory and in peanut fields. In the laboratory, the combinations had a synergistic or additive effect on the second-instar larvae of H. oblita and caused faster mortality than one nematode species or insecticide alone. Heterorhabditis bacteriophora-chlorantraniliprole and H. bacteriophora-imidacloprid showed synergistic effects on the larvae. When higher concentrations of the insecticides were combined with nematodes, the stronger synergistic effects were found. In peanut fields, S. longicaudum- imidacloprid, H. bacteriophora-imidacloprid, or H. bacteriophora-chlorantraniliprole also showed synergistic effects against the larvae. The three nematode-insecticide combinations produced similar percentage reductions of the grub larvae and less percentages of injured legumes, compared with the chlorpyrifos treatment. Cost-benefit analysis showed that H. bacteriophora 5.0 x 10(3) infective juveniles (IJs)per plant (equal to 7.5 x 10(8) lJ ha(-1)) combined with imidacloprid at the recommended concentration is a practical strategy for the practitioner to manage the white grubs in the peanut production.