苏云金素对智利小植绥螨及其猎物二斑叶螨的毒力测定  

A LABORATORY TEST ON THE TOXICITY OF THURINGIENSIN TOTETRANYCHUS URTICAE [ACARI: TETRANCHIDAE] AND PHYTOSEIULUS PERSIMILIS [ACARI: PHYTOSEIIDAE]

作　　者：郭玉杰[1] 左广胜 赵军华[1] 王念英 蒋金炜[2] 

机构地区：[1]中国农业科学院生物防治研究所,北京100081 [2]河南农业大学植保系,郑州450002

出　　处：《生物防治通报》1993年第4期151-155,共5页

基　　金：国家85-010-02生物防治及制剂研究基金;国家自然科学基金

摘　　要：苏云金素处理后第3天智利小植绥螨和二斑叶螨幼螨的LC_(50)分别为211.33μg/ml和114.58μg/ml。两种雌成螨的产卵量第2天即明显减少,高剂量处理后3～4天,导致产卵停止。处理后第5天,智利小植绥螨和二斑叶螨成螨的LC_(50)分别为843.19μg/ml和279.88μg/ml。试验结果表明,苏云金素对两种幼螨是一种高效、无选择性的杀螨剂,对智利小植绥螨的卵和成螨毒性相对较低,但能抑制其雌成螨的产卵量,降低种群趋势指数,在释放智利小植绥螨期间应尽量避免用药。The toxicity of thuringiensin (orβ-toxin) produced by Bacillus thuringiensis (Bt) isolate CT-43 to the predatory mite, Phytoseiulus persimilis, and its prey, the two-spotted spider mite, Tetranychus urticae was tested in the laboratory in Beijing during 1992. At the 3rd-day after treatment, the LC50 of the larvae of T. urticae and P. persimilis was 114.58 μg/ml and 211 μg/ml, respectively. Oviposition of both prey spider mite and the predatory mite was reduced by the thuringiensin treatment. The oviposition began to decline at the 2nd-day after the treatment, and ceased completely 3-4 days after the treatment. At the 5th-day after the treatment, the LC50 of the adults of the prey and the predator was determined to be 279.88μg/ml and 843.19μg/ml, respectively. It is concluded that thuringiensin has a non-selective acaricidal effect. Although its toxicity to the phytoseiid predatory mite was lower than that to the two-spotted spider mite, indicating an obvious inhibiting effect on the predator's oviposition. It is thus suggested that use of thuringiensin should be avoided when release of P. persimilis is a necessary component of pest control programmes.

关 键 词：苏云金素 智利小植绥螨 二斑叶螨 

分 类 号：S482.7[农业科学—农药学]