为选择及时有效控制灰飞虱的杀虫剂，采用稻茎浸渍法测定了即墨稻区灰飞虱3龄若虫对8种常用杀虫剂的致死中时（LT50），研究了不同类型8种常用杀虫剂（呋虫胺、吡虫啉、啶虫脒、氟啶虫酰胺、吡蚜酮、噻嗪酮、溴氰虫酰胺、螺虫乙酯）在农药产商推荐浓度下对山东省稻区灰飞虱的速效性。结果表明：在推荐浓度下，呋虫胺（LT50为22．4 h）的速效性最佳，吡虫啉、溴氰虫酰胺（LT50分别为27．2 h 和28．2 h）次之，啶虫脒、螺虫乙酯、氟啶虫酰胺、噻嗪酮、吡蚜酮（LT50分别为65．3、68．0、74．9、80．1 h 和86．7 h）较差。该结果可为灰飞虱的化学防治提供参考。%To select the insecticides,which could effectively control the damage of the small brown plant hopper (SBPH),Laodelphax striatellus,the rapid efficiency of 8 insecticides,dinotefuran,imidacloprid,ac-etamiprid,flonicamid,pymetrozine,buprofezin,cyantraniliprole,spirotetramat,were determined with the concentrations recommended by pesticide producers.The median lethal time (LT50 )of 8 insecticides to 3 -instar nymph of SBPH were calculated by feeding on the rice seedlings dipped in insecticides in rice areas of Jimo.The results showed that with the recommended concentrations,the rapid efficiency of dinotefuran was the best with the LT50 of 22.4 h,while that of imidacloprid and cyantraniliprole was second with the LT50 of 27.2 h and 28.2 h respectively,and that of acetamiprid,spirotetramat,flonicamid,buprofezin and py-metrozine was worse with the LT50 of 65.3,68.0,74.9,80.1 and 86.7 h respectively.These results would provide references for the chemical control of SBPH.
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