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为科学用药,采用稻茎浸渍法测定了我国7省(区)42个田间褐飞虱种群对吡虫啉的敏感性时空变化。结果表明,在1996-2003年,除了1997年广西桂林种群为低水平抗性(6.3倍)外,苏、皖、桂3省13个种群对吡虫啉为敏感至敏感性下降(<5倍);然而,2005年苏、浙、皖、赣、湘、桂6省(区)16个大田种群对吡虫啉的抗性迅速上升,达高水平至极高水平抗性(79~811倍);2006年,除江苏通州大田种群的抗性为627倍外,苏、浙、皖、赣、湘、桂、闽7省(区)11个种群的抗性为150~322倍,比2005年有一定程度下降,这可能与暂停使用吡虫啉有关。室内用吡虫啉对褐飞虱筛选18代,其抗性由筛选前的208.3倍上升到筛选后的1110.8倍,抗性现实遗传力(h2)为0.1414。这暗示褐飞虱对吡虫啉产生高水平抗性后,如继续使用吡虫啉防治,其抗性可能会进一步上升。还讨论了稻褐飞虱抗药性的治理策略。
For scientific use, rice stem dipping method was used to determine the spatial and temporal variations of the sensitivity of imidacloprid to BPH in 42 fields in 7 provinces (regions) in China. The results showed that in 1996-2003, except for the low level resistance (6.3 times) in Guilin of Guangxi in 1997, 13 populations in three provinces of Jiangsu, Anhui and Guangxi were sensitive to imidacloprid (P < However, resistance to imidacloprid in 16 fields in six provinces (districts) of Jiangsu, Zhejiang, Anhui, Jiangxi, Hunan and Guangxi in 2005 increased rapidly and reached a high level (79 ~ 811 times); in 2006, The resistance of 11 populations in Jiangsu, Zhejiang, Anhui, Jiangxi, Hunan, Guangxi and Fujian provinces was 150 ~ 322 times more than that of the population of Tongzhou in Jiangsu province, which was lower than that of 2005 , Which may be related to the suspension of imidacloprid. In indoor use of imidacloprid for 18 generations of BPH, the resistance increased from 208.3 times before screening to 1110.8 times after screening, and the actual resistance (h2) was 0.1414. This suggests that the resistance of the planthopper to the high level of resistance to imidacloprid may continue to increase with imidacloprid control. Also discussed the resistance of rice brown planthopper management strategy.