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.
维普
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