摘要
在实验室内用6种农药的非致死浓度(LC_(0-0.7)),处理感染有叶螨卵的菜豆叶,观察对智利植绥螨产卵量和卵孵化率的影响。结果表明:尼索郎(50×10^(-6))和卡死克(50×10^(-6))对智利螨的产卵量和卵的孵化都没有有害影响。双甲脒(2×10^(-6))对智利螨的产卵量无影响,但卵的孵化率仅为对照的1/3。NC-129(200×10^(-6))、天王星(0.2×10^(-6))和功夫(0.05×10^(-6))均能降低智利螨的产卵量,比对照分别减少28.3％、17.8％和14.4％。尼索郎、卡死克和双甲脒不影响温室菜豆上智利螨的定居率,NC-129、天王星和功夫则有严重影响:对照组智利螨定居率为85％,NC-129组的定居率仅为25％,天王星和功夫处理后完全没有定居。试验指出,尼索郎和卡死克对智利螨属安全农药,NC-129对智利螨有较大的影响,双甲脒、天王星和功夫对捕食螨是有害的。
In the laboratory tests conducted in Beijing in 1991, leaves of common bean (Phaseolus vulgaris) were infested with spider mites (Tetranychus truncatus) and sprayed with six commonly used pesticides at sublethal concentrations (LC0-6.7)to examine their impact on the oviposition, egg-hatching rate and settlement of the predacious mite, Phytoseiulus persimilis. The pesticides tested were hexythiazox (50ppm), flufenoxuron (50ppm), amitraz (2ppm), pyridaben (200ppm), biphenthrin (0.2ppm) and cyhalothrin (0.05ppm). The results showed that hexythiazox and flufenoxuron had no harmful effect on the oviposition and egg-hatching of the predator. Amitraz had no obvious effect on the oviposition of the predator, but reduced egg-hatching rate by 2/3 compared with that in the control. Pyridaben, biphenthrin and cyhalothrin reduced oviposition by 28.3%, 17.8% and 14.4%, respectively. In a greenhouse test, the settlement of P. persimilis on the bean plants was not influenced by hexythiazox, fluofenoxuron or amitraz, but by pyridaben, biphenthrin and cyhalothrin. The settlement rate was 85% on the control plants, but only 25% on the plants treated with pyridaben and 0% on those treated with either biphenthrin or cyhalothrin. These results indicated that hexythiazox and flufenoxuron were safe to P. persimilis, while pyridaben had relatively harmful effect and amitraz, biphenthrin and cyhalothrin were harmful to the predator.
基金
中国农业科学院院长基金
关键词
智利植绥螨
产卵
定居
农药
Phytoseiulus persimilis Tetranychus truncatus side-effect of pesticides predator
