Combined Toxicity of Lufenuron and Other Insecticides to Panonychus citri(McGregor)
In order to screen the compound pesticides that have synergistic effect with lufenuron on Panonychus citri(McGregor),the combined virulent properties of lufenuron with pyrid-aben,avermectins,bifenazate,cyflumetofen,propargite and chlorfenapyr were determined by spray method.The combined virulence of each combination was evaluated by measuring co-tox-icity factor and co-toxicity coefficient.The results showed that there were 8 groups of combina-tion 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 1 000∶287.There were 10 groups of combination with co-toxicity coefficient greater than 120.The better co-toxicity coefficient and the better sig-nificant synergism of lufenuron combined with avermectins,cyflumetofen and pyridaben was the mass ratios of 1 000∶22,1 000∶240 and 1 000∶1 173,with the co-toxicity coefficient of 156.65,140.43 and 159.03,and the LC50 of 42.463 mg/L,25.740 mg/L and 39.619 mg/L,re-spectively.Therefore,lufenuron and pyridaben have the best control effect on Panonychus citri when combined at a mass ratio of 1 000∶1 173,The results provided a theoretical basis for the control of pest mites in the field and the scientific and rational use of lufenuron.
万方数据
维普
