虱螨脲与其他药剂对柑橘全爪螨的联合毒力

Combined Toxicity of Lufenuron and Other Insecticides to Panonychus citri(McGregor)

为筛选与虱螨脲复配对柑橘全爪螨[Panonychus citri(McGregor)]具有增效作用的农药,采用喷雾法测定了虱螨脲与哒螨灵、阿维菌素、联苯肼酯、丁氟螨酯、炔螨特、虫螨腈复配后对柑橘全爪螨雌成螨的联合毒力,并通过测定共毒因子和共毒系数对各复配组合的联合毒力进行评价.结果表明,共毒因子大于20的有8组,其中虱螨脲与丁氟螨酯按质量比1000∶287复配时,共毒因子最高达79.78;共毒系数大于120的有10组,其中虱螨脲与阿维菌素、丁氟螨酯、哒螨灵分别按质量比1000∶22,1000∶240,1000∶1173复配时,共毒系数更大,增效作用更明显,其共毒系数分别为156.65,140.43,159.03,LC_(50)分别为42.463 mg/L,25.740 mg/L,39.619 mg/L.因此,虱螨脲与哒螨灵按质量比1000∶1173复配时,对柑橘全爪螨具有最佳的防治效果.研究结果为田间害螨防治及虱螨脲的科学合理使用提供了理论基础.

In order to screen the compound pesticides that have synergistic effect with lufenuron on Panonychus citri(McGregor),the combined virulent properties of lufenuron with pyridaben,avermectins,bifenazate,cyflumetofen,propargite and chlorfenapyr were determined by spray method.The combined virulence of each combination was evaluated by measuring co-toxicity factor and co-toxicity coefficient.The results showed that there were 8 groups of combination with co-toxicity factor greater than 20,and the highest co-toxicity factor was 79.78 with the mass ratio of lufenuron to cyflumetofen of 1000∶287.There were 10 groups of combination with co-toxicity coefficient greater than 120.The better co-toxicity coefficient and the better significant synergism of lufenuron combined with avermectins,cyflumetofen and pyridaben was the mass ratios of 1000∶22,1000∶240 and 1000∶1173,with the co-toxicity coefficient of 156.65,140.43 and 159.03,and the LC_(50) of 42.463 mg/L,25.740 mg/L and 39.619 mg/L,respectively.Therefore,lufenuron and pyridaben have the best control effect on Panonychus citri when combined at a mass ratio of 1000∶1173,The results provided a theoretical basis for the control of pest mites in the field and the scientific and rational use of lufenuron.