Coccinella septempunctata L. is a dominant predator of herbivorous pest insects (e.g. aphids) in various crops in Pakistan. A series of bioassays were conducted to determine the sublethal and residual activities of six insecticides, which are commonly used in canola crop (Brassica napus L.) in Pakistan on adult and fourth instar larvae of Coccinella septempunctata L. in laboratory conditions. We measured the mortality, uncoordination and consumption rate of coccinellid beetle to identify the products with comparatively low toxicity or short duration effects. Six insecticides (imidacloprid, thiamethoxam, profenophos, chlorpyriphos, lambda-cyhalothrin and cypermethrin) were used to treat aphids and arenas at sublethal concentration (LC₃₀). Compared to control treatment, increased mortality and knockdown effects were observed following contact with residues and prey treated with all insecticides. While predatory efficiency of both adult and larval stages of C. septempunctata was significantly decreased after treatments. However, significantly lower mortality and high prey consumption were observed after treatment with imidacloprid and thiamethoxam (neonicotinoids) compared to other four insecticides. Results of choice and no-choice tests using field doses and ½ field doses also confirmed the significant difference in consumption of prey between imidacloprid, thiamethoxam and other four chemicals. Larvae and adult of C. septempunctata preferentially consumed untreated aphids than treated aphids with ½ and maximum field dose over the 5 h experimental period. This study provides information to guide canola growers in their selection of insecticides.

中文翻译：

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六种杀虫剂对被污染的猎物和残留物接触后对七星瓢虫的捕食活性和存活的亚致死作用

Coccinella septempunctata  L.是巴基斯坦各种农作物中草食性害虫（例如蚜虫）的主要捕食者。一系列的生物测定法进行了测定亚致死和六种杀虫剂，这是在加拿大油菜作物（通常使用的残留的活性油菜 巴基斯坦L.）对成人和第四龄幼虫七星瓢虫 L.在实验室条件下。我们测量了球虫甲虫的死亡率，不协调性和消耗率，以鉴定毒性较低或作用时间较短的产品。六种杀虫剂（吡虫啉，噻虫嗪，丙氧磷，毒死pho，λ-氯氟氰菊酯和氯氰菊酯）用于处理亚致死浓度（LC _30）的蚜虫和竞技场）。与对照处理相比，在与所有杀虫剂处理过的残留物和猎物接触后，观察到死亡率和击倒作用增加。治疗后，成年C. septempunctata幼虫阶段的捕食效率均显着降低。但是，与其他四种杀虫剂相比，吡虫啉和噻虫嗪（新烟碱类）治疗后，死亡率和猎物消耗显着降低。使用田间剂量和½田间剂量进行的选择和不作选择的测试结果也证实吡虫啉，噻虫嗪和其他四种化学物质在猎物消费上存在显着差异。南美白对虾的幼虫和成虫在5小时的实验期内，与未经处理的蚜虫相比，优先食用的未处理蚜虫具有½和最大田间剂量。该研究为指导菜籽油种植者选择杀虫剂提供了信息。