不同农药对木瓜秀粉蚧的毒力及复配增效作用

为筛选对入侵害虫木瓜秀粉蚧毒力较好的农药及复配增效配比,为该虫的化学药剂防治提供理论依据,本文采用叶面喷雾法测定了11种农药对木瓜秀粉蚧2龄若虫的室内毒力,挑选毒力较好的两种药剂进行复配,筛选增效配比,并进行田间药效试验。结果表明,11种农药对木瓜秀粉蚧的毒力大小依次为:螺螨酯>哒螨灵>噻虫胺>联苯菊酯>矿物油>高效氯氰菊酯>炔螨特>啶虫脒>吡虫啉>噻螨酮>四螨嗪。哒螨灵与螺螨酯(60∶40)复配共毒系数最大,为182.47。田间药效试验发现,混配药剂防效均高于单剂且达到差异显著。

Toxicities and synergism of different pescticides against Paracoccus marginatus

This study aimed to get the information of high activity and compounding synergies ratio pesticides against invasive pest Paracoccus marginatus.Toxicities of 11 pesticides against P.marginatus 2 nd instar nymphs were investigated by leaf spray method,the two screened pesticides with highest activity were compounded with different ratio toxicities and efficacy of synergy ratio was tested in field.The results showed that the order of the toxicity was:Spirodiclofen>pyridaben>clothianidin>bifenthrin>mineral oil>beta cypermethrin>propargite>acetamiprid>Imidacloprid>hexythiazox>clofentezine.The co-toxicity coefficient of pyridaben and spirodiclofen(60∶40)was the highest(182.47).Field experiments indicated that the mixture of pyridaben and spirodiclofen(60∶40)was better than that of their each single.Field control reached significant difference.