Department of Entomology, Texas A&M University, College Station, TX, USA.
Texas A&M AgriLife Extension Service, Port Lavaca, TX, USA.
J Econ Entomol. 2024 Oct 14;117(5):2060-2069. doi: 10.1093/jee/toae155.
Along the Coastal Bend of Texas, the rice stink bug, Oebalus pugnax (F.), is a major pest of grain sorghum and rice that is primarily managed by insecticide applications. Reports of rice stink bug resistance to pyrethroids in Texas first surfaced in 2015 and continued to spread. To determine the status of pyrethroid resistance, rice stink bug populations across Texas and Louisiana were evaluated from 2021 to 2023. Mortality was assessed through glass vial exposures to eight concentrations (0, 0.03, 0.1, 0.3, 1, 3, 10, and 30 μg/vial) of a pyrethroid, lambda-cyhalothrin. The concentration of lambda-cyhalothrin required to kill 50% (LC50) of each population was estimated by probit analysis. Furthermore, the efficacy of insecticides, including lambda-cyhalothrin, dimethoate, and dinotefuran, were evaluated in field experiments conducted in 2021. Our results indicated that 14 of the 21 rice stink bug populations sampled were resistant to lambda-cyhalothrin, with LC50 values ranging from 42 to 1,600 times higher than a susceptible population. In the field trial, lambda-cyhalothrin did not control rice stink bugs. Dinotefuran provided excellent control of nymphs, but dimethoate provided greater control of adult rice stink bugs. To our knowledge, this is the first study to thoroughly evaluate the extent or geographic range of pyrethroid resistance in Texas for rice stink bugs.
在德克萨斯州的沿海弯曲处，稻绿蝽（Oebalus pugnax (F.)）是高粱和水稻的主要害虫，主要通过杀虫剂的应用来控制。德克萨斯州首次报告稻绿蝽对拟除虫菊酯的抗药性是在 2015 年，此后抗药性不断蔓延。为了确定拟除虫菊酯抗性的现状，从 2021 年到 2023 年，对德克萨斯州和路易斯安那州的稻绿蝽种群进行了评估。通过玻璃管暴露于八种浓度（0、0.03、0.1、0.3、1、3、10 和 30μg/管）的拟除虫菊酯，lambda-氯氟氰菊酯，评估死亡率。用概率分析估计每种种群杀死 50%（LC50）的 lambda-氯氟氰菊酯浓度。此外，在 2021 年进行的田间试验中评估了杀虫剂的功效，包括 lambda-氯氟氰菊酯、乐果和涕灭威。结果表明，在所采样的 21 个稻绿蝽种群中，有 14 个种群对 lambda-氯氟氰菊酯具有抗性，LC50 值比敏感种群高 42 至 1600 倍。在田间试验中，lambda-氯氟氰菊酯不能控制稻绿蝽。涕灭威对若虫有很好的防治效果，但乐果对成虫的防治效果更好。据我们所知，这是首次全面评估德克萨斯州稻绿蝽对拟除虫菊酯的抗性程度或地理范围的研究。
