蛇床子素粉剂对储粮害虫的持效性测定

The Validity of Osthole Powder against Main Stored-grain Insects

应用蛇床子素粉剂对5种主要储粮害虫的持效性进行了测定。结果表明,处理剂量、处理时间和试虫不同其持效性不同,在使用剂量为1.6 mg·kg-1、0.8 mg.kg-1时,对玉米象、谷蠹成虫的持效性最长,其次是对长角扁谷盗、赤拟谷盗成虫,对锯谷盗成虫的持效性较差;处理6个月后对玉米象、谷蠹成虫的校正死亡率分别为96.67%、91.11%和100%、96.43%,处理4个月后对长角扁谷盗成虫校正死亡率分别为97.37%、78.95%,处理3个月后对赤拟谷盗成虫的校正死亡率分别为100.00%、61.11%,处理2个月后对锯谷盗成虫的校正死亡率分别为94.12%、58.82%;在相同条件下,1.6 mg.kg-1、0.8 mg·kg-1蛇床子素粉剂处理对玉米象、谷蠹、长角扁谷盗、赤拟谷盗、锯谷盗成虫的持效性,比谷虫净保护剂(1 000 mg·kg-1)和化学防护剂防虫磷(10 mg·kg-1)都长,由此可初步确定蛇床子素粉剂在实际使用时的适宜剂量可为0.8mg·kg-1。

The validity of Osthole powder against 5 species of main stored-grain insects were studied in this paper.The re-sults showed that the validity of high dosage was better than low dosage,and the validity was vary with different control object.Under the using dosage 1.6 mg·kg^-1 and 0.8 mg·kg^-1,there were the longest validity to S.zeamais and R.dominica,latter validity to C.pusillus and T.castaneum,lattermost validity to O.surinamensis.After 6 months treatment,the corrected mortality of adult of S.zeamais and R.dominica were 96.67%,91.11% and 100.00%,96.43%.After 4 months treatment,the corrected mortality of adult of C.pusillus were 97.37% and 78.95%.After 3 months treatment,the corrected mortality of adult of T.castaneum were 100.00% and 61.11%.After 2 months treatment,the corrected mortality of adult of O.surinamensis were 94.12% and 58.82%.Under the same conditions,The validity of osthole powder adding pesticide synergis was better than Guchongjing（1000 mg·kg^-1） and Fangchongling（10 mg·kg^-1） to adult of S.zeamais,R.dominica,C.pusillus,T.castaneum,and O.surinamensis under 1.6 mg·kg^-1,0.8 mg·kg^-1.Then 0.8 mg·kg^-1 dosage was befittingly to put in practice in the futrue.