啶虫脒及吡虫啉对瓜蚜室内生物测定研究

Bioassay of Acetaniprid and Imidacloprid on Melon Aphid

瓜蚜（棉蚜）的寄主广泛，常常对瓜类、棉花、烟草等蔬菜和经济作物造成严重危害。在温室的瓜类上瓜蚜可常年繁殖危害，以成虫和若虫取食瓜类嫩叶及生长点，使叶片及生长点卷缩，老叶受害后变黄。化学防治瓜蚜是综合治理的主要措施之一，对瓜蚜种群具有很强的抑制作用。用药液浸渍法测定了啶虫脒和吡虫啉对瓜蚜的毒性，结果表明：在10-80mg／kg浓度下吡虫啉的防效54.20％～89．04％，高于啶虫脒35．45％～87．34％；用药24h后吡虫啉对瓜蚜致死中浓度LG50为9．674mg／L、啶虫脒LG50为14．0685mg／L，吡虫啉对瓜蚜的毒性是啶虫脒的1．45倍。

There were a lots of plant host on which Aphis gossypii feeds. Melon, bean, cotton and tobacco were heavily damaged by this species. When adults and nymphs damage on new leaves and new development points the plant could not regularly grow; the old damaged leaves turn yellow and drop off. This aphid could live and damage on cucumber in the whole year in greenhouse. Chemical control was a main method of integrated pest management which has a good efficiency on population of melon aphid. By Petri-dish bioassay the toxin of acetamiprid and imidacloprid on melon aphid were tested. Under 10-80 mg/kg the efficacy of imidacloprid （54. 20%~89. 04%） was higher than that of acetamiprid （35.45%~87. 34%） ; LC50 of acetamiprid was 14. 0685 mg/L and imidacloprid 9. 674 mg/L, the toxin of later was 1.45 times of former.