The activities of catalase ( CAT) , superoxide dismutase ( SOD) and peroxidase ( POD ) were observed in the grain borer adult in different geographical population. The activities of CAT, POD and SOD showed difference among populations in R. dominica adults before fumigation. The results showed that the activities of CAT and POD in different population of adults decreased after fumigation treatment, while the activities of SOD enhanced. The activity of CAT in different populations had expressed significant simple correlation with the lethal concentration ( LC50) of R. dominica populations (P =0. 031 0. 05) ,while the CAT activity showed simple correlation with the POD activity (P =0. 034 <0. 05 ).%对不同地理种群谷蠹成虫体内过氧化氢酶(CAT),超氧化物歧化酶(SOD),过氧化物酶(POD)的活性研究表明:熏蒸前,不同地理种群的谷蠹成虫体内3种保护酶的活性不同；使用磷化氢进行熏蒸处理后,不同地理种群谷蠹体内的3种保护酶活性的变化规律为:SOD活力升高,POD和CAT活性降低.采用SPSS 16.0分别对熏蒸前试验种群的致死中浓度(LC50)及3种酶活性两两变量进行相关性分析,结果表明:试验种群的LC50与CAT之间存在显著简单相关性(P =0.031 ＜0.05)；LC50与SOD,POD两种酶活性不存在显著相关性(P =0.545；0.053 ＞0.05)；CAT及POD之间存在简单相关性(P =0.034 ＜0.05).
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