Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) is one of the most important insect pests of potato (Solanum tuberosum L.). Because of the high value of potato crops, most growers approach management in a ...Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) is one of the most important insect pests of potato (Solanum tuberosum L.). Because of the high value of potato crops, most growers approach management in a similar manner. Chemical control of arthropod pests in potato is the standard pest management practice, and will likely continue to be in the foreseeable future. This heavy reliance on chemical control has led to high levels of insecticide resistance. Strategies that rotate chemistries are critical in order to maintain insecticide efficacy, highlighting the immediate need to evaluate novel chemistries to continue to manage this pest successfully. Working with different populations of L. decemlineata, field and lab experiments were conducted to evaluate the baseline toxicity, ovicidal activity, and field efficacy of the novel insecticide tolfenpyrad to L. decemlineata. Lab assays revealed that tolfenpyrad was toxic to both larvae and adults, and that L. decemlineata treated egg masses had a 0% hatch rate. Potato field plots treated with tolfenpyrad had significantly fewer larvae, less defoliation, and higher tuber yields. These data will provide accurate field rates for proper labeling, a baseline reference for tracking changes in L. decemlineata susceptibility, as well as provide a novel chemistry to aid in resistance management programs.展开更多
为探讨唑虫酰胺茶园使用安全性，在福安福云6号绿茶品种茶园开展残留消解动态试验。结果表明，在54～270 g · hm-2施用剂量下，原始附着量和原始残留量随施用剂量的提高线性增加，烘干不能使残留消解；在108、162、216 g · hm...为探讨唑虫酰胺茶园使用安全性，在福安福云6号绿茶品种茶园开展残留消解动态试验。结果表明，在54～270 g · hm-2施用剂量下，原始附着量和原始残留量随施用剂量的提高线性增加，烘干不能使残留消解；在108、162、216 g · hm -2等推荐使用剂量下，5月份时唑虫酰胺在茶树上的原始残留量高达33.73～67.58 mg · kg -1，降解速度较慢，药后10 d的残留量方低于20 mg · kg -1；在茶园的消解规律符合一级动力学方程，半衰期长达4.02～5.00 d；同一使用剂量在不同季节施药后的残留量有较大差异，9月份的原始残留量显著高于5月份。研究认为唑虫酰胺在茶园使用的食品安全性较低，对于国内市场，建议在茶叶上的残留限量暂定为20 mg · kg -1，安全间隔期15 d。展开更多
文摘Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) is one of the most important insect pests of potato (Solanum tuberosum L.). Because of the high value of potato crops, most growers approach management in a similar manner. Chemical control of arthropod pests in potato is the standard pest management practice, and will likely continue to be in the foreseeable future. This heavy reliance on chemical control has led to high levels of insecticide resistance. Strategies that rotate chemistries are critical in order to maintain insecticide efficacy, highlighting the immediate need to evaluate novel chemistries to continue to manage this pest successfully. Working with different populations of L. decemlineata, field and lab experiments were conducted to evaluate the baseline toxicity, ovicidal activity, and field efficacy of the novel insecticide tolfenpyrad to L. decemlineata. Lab assays revealed that tolfenpyrad was toxic to both larvae and adults, and that L. decemlineata treated egg masses had a 0% hatch rate. Potato field plots treated with tolfenpyrad had significantly fewer larvae, less defoliation, and higher tuber yields. These data will provide accurate field rates for proper labeling, a baseline reference for tracking changes in L. decemlineata susceptibility, as well as provide a novel chemistry to aid in resistance management programs.
文摘为探讨唑虫酰胺茶园使用安全性，在福安福云6号绿茶品种茶园开展残留消解动态试验。结果表明，在54～270 g · hm-2施用剂量下，原始附着量和原始残留量随施用剂量的提高线性增加，烘干不能使残留消解；在108、162、216 g · hm -2等推荐使用剂量下，5月份时唑虫酰胺在茶树上的原始残留量高达33.73～67.58 mg · kg -1，降解速度较慢，药后10 d的残留量方低于20 mg · kg -1；在茶园的消解规律符合一级动力学方程，半衰期长达4.02～5.00 d；同一使用剂量在不同季节施药后的残留量有较大差异，9月份的原始残留量显著高于5月份。研究认为唑虫酰胺在茶园使用的食品安全性较低，对于国内市场，建议在茶叶上的残留限量暂定为20 mg · kg -1，安全间隔期15 d。
