Toxicity test and control efficacy of four insecticides against Brevipalpus lewisi McGregor

Brevipalpus lewisi was a newly-found pest attacking Metasequoia glyptostroboides.The result of the toxicity test in lab and control efficacy in the field showed abamectin·profenophos 37% EC had the highest toxicity to adults with an LC50 of 0.57 mg/L.The next were abamectin 6% EC(80.19 mg/L),pyridaben 6% EC(99.84 mg/L) and emamectin benzoat 0.5% EC(970.34 mg/L) in sequence.The results of field trial were the same.The control effects of the above four insecticides were 97.70%,89.09%,82.36% and 58.09% respectively 24 h after the treatment.