Institute of Vegetable, Wuhan Academy of Agricultural Sciences, Wuhan, P. R. China.
National Agro-Tech Extension Service Center, Beijing, P. R. China.
J Econ Entomol. 2021 Feb 9;114(1):332-338. doi: 10.1093/jee/toaa290.
The beet armyworm Spodoptera exigua (Hübner) is a serious polyphagous pest that infests vegetable crops worldwide and has rapidly developed resistance due to its long-term exposure to insecticides. The current resistance statuses to four insecticides exhibited by three field populations of beet armyworms collected in southern China from 2014 to 2018 were investigated. Monitoring data from five consecutive years demonstrated that all three tested S. exigua populations developed extremely high resistance to chlorantraniliprole in 2018 (220.58- to 2,597.39-fold). Two populations (Baiyun and Fengxian) developed low to moderate resistance to spinosad, whereas the Huangpi population remained susceptible (except in 2014, with RR of 6.11-fold). The RR of the Fengxian and Baiyun populations to indoxacarb steadily increased over the years, whereas that of the Huangpi population increased relatively slowly. The Baiyun and Fengxian populations developed moderate to high resistance to indoxacarb and methoxyfenozide, whereas the Huangpi population exhibited susceptibility to low resistance (1.06- to 6.45-fold) to indoxacarb and susceptibility to moderate resistance (1.53- to 14.22-fold) to methoxyfenozide. These results suggest that chlorantraniliprole should not be employed to control this pest in southern China. Reduced use of indoxacarb and methoxyfenozide or the use of alternating insecticides with low levels of resistance is recommended. Spinosad remains an effective insecticide for the management of S. exigua. To avoid the rapid development of insecticide resistance, rotations of insecticides with low levels of resistance and different modes of action based on the resistance patterns of S. exigua should be performed in southern China.
甜菜夜蛾 Spodoptera exigua（Hübner）是一种严重的多食性害虫，它侵害世界各地的蔬菜作物，并由于长期接触杀虫剂而迅速产生抗药性。本研究调查了 2014 年至 2018 年期间在中国南方采集的三个田间种群对四种杀虫剂的当前抗药性状况。连续五年的监测数据表明，所有三个测试的甜菜夜蛾种群在 2018 年对氯虫苯甲酰胺表现出极高的抗药性（220.58 至 2597.39 倍）。两个种群（白云和奉贤）对多杀菌素表现出低至中度抗药性，而黄皮种群仍然敏感（2014 年除外，RR 为 6.11 倍）。奉贤和白云种群对茚虫威的 RR 多年来稳步增加，而黄皮种群增加相对较慢。白云和奉贤种群对茚虫威和甲氧虫酰肼表现出中至高抗药性，而黄皮种群对茚虫威表现出低至中度抗药性（1.06 至 6.45 倍）和对甲氧虫酰肼表现出中抗药性（1.53 至 14.22 倍）。这些结果表明，氯虫苯甲酰胺不应在中国南方用于控制这种害虫。建议减少使用茚虫威和甲氧虫酰肼或交替使用低水平抗性的杀虫剂。多杀菌素仍然是防治甜菜夜蛾的有效杀虫剂。为避免杀虫剂抗药性迅速发展，应根据甜菜夜蛾的抗药性模式，在中国南方使用低水平抗性和不同作用方式的杀虫剂进行轮换。
