Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong, 271018, China.
Research Center of Pesticide Environmental Toxicology, Shandong Agricultural University, Tai'an, Shandong, 271018, China.
Chemosphere. 2019 Jun;225:182-190. doi: 10.1016/j.chemosphere.2019.03.025. Epub 2019 Mar 6.
Coccinella septempunctata is a common insect predator that provides biological control of many destructive arthropod pests. An assessment of the toxicity of pesticides to predators is a necessary component of Integrated Pest Management (IPM) strategies. In order to evaluate the risks of field insecticide application, we studied the influence of chlorantraniliprole on C. septempunctata larvae using different exposure doses. Chlorantraniliprole exhibited low contact toxicity against 2nd instar larvae of C. septempunctata with the LR was 482.7063 g a.i. ha by after a 72-h exposure. In a long-term test, the LR of chlorantraniliprole for C. septempunctata decreased from 88.97 to 58.22 g a.i. ha, while the hazard quotient (HQ) values were below the threshold value of 2 during the entire observation period. This indicated a low toxicity risk from insecticide exposure. The total effect (E) suggested that chlorantraniliprole could be classified as harmless/slightly harmful to C. septempunctata below/at 200% of the MRFR (the manufacturer maximum recommended field rate) of 120 g a.i. ha. We also determined no observed effect application rates (NOERs) of chlorantraniliprole on survival (7.5 g a.i. ha), developmental time (15 g a.i. ha) and fecundity (30 g a.i. ha). Chlorantraniliprole significantly reduced the pupation rate, adult emergence, egg hatchability, and predation success. Population parameters, including R, r, λ, and T were significantly affected when C. septempunctata were treated with chlorantraniliprole at higher label rates. These results demonstrated that the use of chlorantraniliprole may reduce C. septempunctata population levels and the level of biological control provided by this species.
异色瓢虫是一种常见的昆虫捕食者，对许多破坏性节肢动物害虫具有生物防治作用。评估杀虫剂对捕食者的毒性是综合虫害管理（IPM）策略的必要组成部分。为了评估田间杀虫剂应用的风险，我们使用不同的暴露剂量研究了氯虫苯甲酰胺对异色瓢虫幼虫的影响。氯虫苯甲酰胺对异色瓢虫 2 龄幼虫的接触毒性较低，经 72 小时暴露后，LR 为 482.7063μg a.i./ha。在长期试验中，氯虫苯甲酰胺对异色瓢虫的 LR 从 88.97 降至 58.22μg a.i./ha，而整个观察期间危险商数（HQ）值均低于 2 的阈值。这表明杀虫剂暴露的毒性风险较低。总效应（E）表明，在 120μg a.i./ha 的 MRFR（制造商建议的最大田间用量）的 200%以下/以下，氯虫苯甲酰胺对异色瓢虫可归类为无害/轻度有害。我们还确定了氯虫苯甲酰胺对生存（7.5μg a.i./ha）、发育时间（15μg a.i./ha）和繁殖力（30μg a.i./ha）无观察效应的应用率（NOER）。氯虫苯甲酰胺显著降低了蛹化率、成虫羽化率、卵孵化率和捕食成功率。当异色瓢虫用氯虫苯甲酰胺处理时，种群参数，包括 R、r、λ和 T 均受到显著影响，标签用量较高。这些结果表明，氯虫苯甲酰胺的使用可能会降低异色瓢虫的种群水平及其提供的生物防治水平。
