【摘要】 1977年测得浙江省用药水平不同地区的夏季初见褐稻虱对丙体六六六和马拉硫磷的敏感度分别有6.8和3.1倍的差异。在防治田中的秋季褐稻虱对丙体六六六的敏感度与夏季迁入虫相比,下降4.7倍,而对马拉硫磷无明显变化。抗丙体六六六的褐稻虱对马拉硫磷、对硫磷和杀螟松的敏感度与敏感的相比,未发现有明显的差异。更多还原

【Abstract】 A survey on the susceptibility of brown planthopper collected fromdifferent areas of Zhejiang province to γBHC,malathion and parathionwas tested by topical application in 1977.The data obtained showedthat resistance of brown planthopper to γBHC and malathion appearedin paddy rice fields between June and early July in the areas of thisprovince was 2.4～6.8 and 3 times respectively in comparison with thatof Wucun Juxian County.The autumnal generation was 4.7-fold resistantto γBHC as compared with LD₅₀ of the immigrant summer generation.The resistant laboratory strain originated from the autumnal generationin Dongyang County was 11.5 times resistant to γBHC as comparedwith the susceptible strain from the immigrant summer generation inWucun Juxian County.It was found that the susceptibility of the above-mentioned strain （γBHC-resistant strain） to organophosphates such asmalathion,parathion and sumithion was the same as the susceptiblestrain.更多还原