Resistance of five field populations of Mythimna separata（Walker） collected from Shaanxi and Shanxi provinces of China to six different insecticides was evaluated by leaf dip method in the laboratory. The results sh...Resistance of five field populations of Mythimna separata（Walker） collected from Shaanxi and Shanxi provinces of China to six different insecticides was evaluated by leaf dip method in the laboratory. The results showed that all populations were relatively sensitive to emamectin benzoate with a resistance ratio（RR） of 0.583–1.583 folds. All populations showed susceptible or low level resistance to chlorantraniliprole and beta-cypermethrin. Compared with a relatively susceptible strain of M. separata, the resistance level of the whole populations ranged from susceptible to moderate to chlorpyrifos and lambda-cyhalothrin, moderate to high to phoxim（RR=19.367–70.100） except for population from Sanyuan County（RR=2.567）. Pair-wise correlation analysis among different insecticides indicated that chlorpyrifos has a significantly positive and significant correlation with emamectin benzoate. Chlorantraniliprole didn＇t have significant correlation with emamectin benzoate, chlorpyrifos and phoxim. Therefore, emamectin benzoate, chlorantraniliprole and beta-cypermethrin are recommended to control oriental armyworm. Meanwhile, to postpone the occurrence and development of insecticide resistance in Shaanxi and Shanxi provinces, alternative and rotational application of insecticides between chlorantraniliprole and emamectin benzoate or chlorpyrifos is necessary.展开更多
The oriental armyworm,Mythimna separata（Walker）（Lepidoptera：Noctuidae）,is a major migrant pest of grain in China and other Asian countries,causing huge crop production and economic losses nationwide annually.Much...The oriental armyworm,Mythimna separata（Walker）（Lepidoptera：Noctuidae）,is a major migrant pest of grain in China and other Asian countries,causing huge crop production and economic losses nationwide annually.Much of the uniquely difficult aspects of managing M.separata arises from its long-distance migratory behavior.For example,direction and timing of winds from its overwintering regions in the south largely determine where and when large influxes of migrants arrive in the north to oviposit,making prediction of infestations difficult.展开更多
研究了粘虫(Mythimna separate Walker)在武汉地区的种群动态及其越冬规律。结果表明,粘虫成虫在武汉地区主要有两个发生高峰,分别为4月中下旬和10月中下旬。田间粘虫幼虫发生的高峰期主要在11月至次年的3月。有再生苗的稻田内粘虫幼虫...研究了粘虫(Mythimna separate Walker)在武汉地区的种群动态及其越冬规律。结果表明,粘虫成虫在武汉地区主要有两个发生高峰,分别为4月中下旬和10月中下旬。田间粘虫幼虫发生的高峰期主要在11月至次年的3月。有再生苗的稻田内粘虫幼虫的发生量显著高于无再生苗的稻田。在越冬期间,粘虫并未进入滞育状态,而以幼虫形态越冬。粘虫幼虫在越冬期间的过冷却点与冰点均随发育程度上升而下降;死亡率则随温度的降低显著上升,两者之间的关系可用线性方程y=-1.529 1x+28.459 0表示。展开更多
基金supported by the Special Fund for Agroscientific Research in the Public Interest of China (201403031)the Research Project Program of Agricultural Science and Technology innovation Transformation in Shaanxi Province, China
文摘Resistance of five field populations of Mythimna separata（Walker） collected from Shaanxi and Shanxi provinces of China to six different insecticides was evaluated by leaf dip method in the laboratory. The results showed that all populations were relatively sensitive to emamectin benzoate with a resistance ratio（RR） of 0.583–1.583 folds. All populations showed susceptible or low level resistance to chlorantraniliprole and beta-cypermethrin. Compared with a relatively susceptible strain of M. separata, the resistance level of the whole populations ranged from susceptible to moderate to chlorpyrifos and lambda-cyhalothrin, moderate to high to phoxim（RR=19.367–70.100） except for population from Sanyuan County（RR=2.567）. Pair-wise correlation analysis among different insecticides indicated that chlorpyrifos has a significantly positive and significant correlation with emamectin benzoate. Chlorantraniliprole didn＇t have significant correlation with emamectin benzoate, chlorpyrifos and phoxim. Therefore, emamectin benzoate, chlorantraniliprole and beta-cypermethrin are recommended to control oriental armyworm. Meanwhile, to postpone the occurrence and development of insecticide resistance in Shaanxi and Shanxi provinces, alternative and rotational application of insecticides between chlorantraniliprole and emamectin benzoate or chlorpyrifos is necessary.
基金the special fund for Agro-scientific Research in the Public Interest of China(201403031)for support of this special focus
文摘The oriental armyworm,Mythimna separata（Walker）（Lepidoptera：Noctuidae）,is a major migrant pest of grain in China and other Asian countries,causing huge crop production and economic losses nationwide annually.Much of the uniquely difficult aspects of managing M.separata arises from its long-distance migratory behavior.For example,direction and timing of winds from its overwintering regions in the south largely determine where and when large influxes of migrants arrive in the north to oviposit,making prediction of infestations difficult.
文摘研究了粘虫(Mythimna separate Walker)在武汉地区的种群动态及其越冬规律。结果表明,粘虫成虫在武汉地区主要有两个发生高峰,分别为4月中下旬和10月中下旬。田间粘虫幼虫发生的高峰期主要在11月至次年的3月。有再生苗的稻田内粘虫幼虫的发生量显著高于无再生苗的稻田。在越冬期间,粘虫并未进入滞育状态,而以幼虫形态越冬。粘虫幼虫在越冬期间的过冷却点与冰点均随发育程度上升而下降;死亡率则随温度的降低显著上升,两者之间的关系可用线性方程y=-1.529 1x+28.459 0表示。
