Steinhaus Eduardo A, Warpechowski Luiz F, Braga Luiz E, Morin Manuel, Tenório Camila, Boff Jéssica S, Bernardi Oderlei, Farias Juliano R
Department of Plant Protection, Universidade Regional Integrada do Alto Uruguai e Missões (URI), Universidade das missões avenue 464, Santo Ângelo, Rio Grande do Sul 98802-470, Brazil.
Department of Plant Protection, Universidade Federal de Santa Maria, Roraima avenue 1000, Santa Maria, Rio Grande do Sul 97105-900, Brazil.
J Econ Entomol. 2022 Apr 13;115(2):631-636. doi: 10.1093/jee/toac013.
This study evaluated intra- and interspecific variation regarding the susceptibility to insecticides of key pentatomid pests of soybean (Glycine max L.) and maize (Zea mays L.) crops in Brazil. To perform bioassays, populations of Euschistus heros (F.), Diceraeus (=Dichelops) furcatus (F.), Nezara viridula (L.), and Piezodorus guildinii (Westwood) (Hemiptera: Pentatomidae) were collected in soybean fields in Southern Brazil during the 2020/2021 crop season. Then, stink bugs were exposed to doses of commercial insecticides commonly applied for its control in dip-test bioassays using fresh green bean pods. In general, all stink bug species and populations studied were susceptible to acephate, acetamiprid + bifenthrin, imidacloprid + bifenthrin, and ethiprole, with mortality rates > 80%. Most populations of E. heros and D. furcatus, considered the main stink bugs that attack soybean and maize, respectively, presented low or intermediate susceptibility to acetamiprid + α-cypermethrin, ζ-cypermethrin + bifenthrin, dinotefuran + λ-cyhalothrin, and bifenthrin + carbosulfan. Except for bifenthrin + carbosulfan (mortality < 57%), secondary stink bugs species that attack soybean (N. viridula and P. guildinii) showed pronounced susceptibility to all insecticides tested, with mortality rates > 70%. In summary, the populations of E. heros and D. furcatus showed diminished susceptibility to various insecticides formulated with the mixture of neonicotinoids + pyrethroids, whereas N. viridula and P. guildinii were most susceptible to the insecticides evaluated. The implications of these findings to integrated and resistance management programs are discussed.
本研究评估了巴西大豆（Glycine max L.）和玉米（Zea mays L.）作物主要蝽象害虫对杀虫剂易感性的种内和种间差异。为进行生物测定，在2020/2021作物季期间，从巴西南部的大豆田采集了英雄埃蝽（Euschistus heros (F.)）、叉角二星蝽（Diceraeus (=Dichelops) furcatus (F.)）、稻绿蝽（Nezara viridula (L.)）和绿腹蝽（Piezodorus guildinii (Westwood)）（半翅目：蝽科）的种群。然后，使用新鲜青豆荚，在浸液试验生物测定中将蝽象暴露于常用于防治的商业杀虫剂剂量下。总体而言，所有研究的蝽象物种和种群对乙酰甲胺磷、啶虫脒 + 联苯菊酯、吡虫啉 + 联苯菊酯和乙虫腈敏感，死亡率 > 80%。分别被认为是攻击大豆和玉米的主要蝽象的英雄埃蝽和叉角二星蝽的大多数种群，对啶虫脒 + α-氯氰菊酯、ζ-氯氰菊酯 + 联苯菊酯、呋虫胺 + λ-氯氟氰菊酯和联苯菊酯 + 丁硫克百威表现出低或中等易感性。除联苯菊酯 + 丁硫克百威（死亡率 < 57%）外，攻击大豆的次要蝽象物种（稻绿蝽和绿腹蝽）对所有测试杀虫剂均表现出显著易感性，死亡率 > 70%。总之，英雄埃蝽和叉角二星蝽种群对新烟碱类 + 拟除虫菊酯类混合配制的各种杀虫剂的易感性降低，而稻绿蝽和绿腹蝽对所评估的杀虫剂最敏感。讨论了这些发现对综合防治和抗性管理计划的影响。
