ABSTRACT Redbanded stink bug, Piezodorus guildinii (Westwood), is a neotropical pest of soybean in the southern United States and the Neotropical Americas. Two strains of Beauveria bassiana (Bals.-Criv) Vuill. (Hypocreales: Cordycipitaceae) were evaluated for potential control of redbanded stink bug. Four concentrations (104, 105, 106, and 107 spores/mL) of both a Mississippi Delta native strain (NI8) and a commercially available formulation (GHA) were tested against field-collected redbanded stink bug adults in the laboratory and evaluated at four time points (3, 5, 10, and 15 days after application). Application methods simulated field sprays and were similar to those previously used to screen several other pests and beneficial insects. Both isolates of B. bassiana tested were pathogenic to redbanded stink bug adults. A significant overall difference between strains (regardless of the concentration) was observed at 3 days after treatment, while differences among concentrations were observed at 10, and 15 days after treatment. The lethal concentration (LC50) and lethal sporulation (LS50) were not significantly different between strains at either 10 or 15 days after treatment. However, higher mortality was observed in cohorts sprayed with GHA at lower concentrations than those sprayed with NI8. Unlike other control options, B. bassiana has a short re-entry interval and no harvest interval, making it a potentially attractive and environmentally benign alternative to conventional synthetic insecticides for control of redbanded stink bug in soybeans. Further testing on juvenile life stages and field testing is needed to evaluate the potential for in-field control.

中文翻译：

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球孢白僵菌对新热带地区大豆主要害虫 Piezodorus guildinii（半翅目：Pentatomidae）的有效性

摘要 红带臭虫 Piezodorus guildinii (Westwood) 是美国南部和新热带美洲大豆的新热带害虫。两株球孢白僵菌 (Bals.-Criv) Vuill。(Hypocreales: Cordycipitaceae) 对红带臭虫的潜在控制进行了评估。密西西比三角洲原生菌株 (NI8) 和市售制剂 (GHA) 的四种浓度（104、105、106 和 107 个孢子/mL）在实验室中针对现场收集的红带臭虫成虫进行了测试，并在四个时间点（应用后 3、5、10 和 15 天）。应用方法模拟田间喷洒，类似于以前用于筛选其他几种害虫和益虫的方法。测试的两种 B. bassiana 分离株对红带臭虫成虫均具有致病性。在处理后 3 天观察到菌株之间的显着总体差异（无论浓度如何），而在处理后 10 天和 15 天观察到浓度之间的差异。处理后 10 天或 15 天，菌株之间的致死浓度 (LC50) 和致死孢子形成 (LS50) 没有显着差异。然而，在喷洒浓度较低的 GHA 的队列中，观察到的死亡率高于喷洒 NI8 的队列。与其他控制选项不同，球孢属菌的重新进入间隔较短且没有收获间隔，使其成为控制大豆中红带臭虫的常规合成杀虫剂的潜在有吸引力且环境友好的替代品。需要进一步测试幼鱼的生命阶段和现场测试，以评估现场控制的潜力。