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首页> 外文期刊>Experimental & applied acarology >Pyrethroid resistance in Phytoseiulus macropilis (Acari: Phytoseiidae): cross-resistance, stability and effect of synergists
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Pyrethroid resistance in Phytoseiulus macropilis (Acari: Phytoseiidae): cross-resistance, stability and effect of synergists

机译：大型植物拟除虫菊酯对拟除虫菊酯类药物的抗性：交叉抗性，稳定性和增效剂的作用

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Phytoseiulus macropilis Banks (Acari: Phytoseiidae) is an effective predator of Tetranychus urticae Koch (Acari: Tetranychidae). The objectives of this research were to study the stability of fenpropathrin resistance and the cross-resistance relationships with different pyrethroids, and also to evaluate the effect of synergists [piperonyl butoxide (PBO), diethyl maleate (DEM) and S,S,S-tributyl phosphorotrithioate (DEF)] on fenpropathrin resistant and susceptible strains of this predaceous mite. The stability of fenpropathrin resistance was studied under laboratory conditions, using P. macropilis populations with initial frequencies of 75 and 50 % of resistant mites. The percentages of fenpropathrin resistant mites were evaluated monthly for a period of up to 12 months. A trend toward decreased resistance frequencies was observed only during the first 3-4 months. After this initial decrease, the fenpropathrin resistance was shown to be stable, maintaining constant resistance frequencies (around 30 %) until the end of the evaluation period. Toxicity tests carried out using fenpropathrin resistant and susceptible strains of P. macropilis indicated strong positive cross-resistance between fenpropathrin and the pyrethroids bifenthrin and deltamethrin. Bioassays with the synergists DEM, DEF and PBO were also performed. The maximum synergism ratio (SR = LC50 without synergist/LC50 with synergist) detected for the three evaluated synergists (PBO, DEM, DEF) was 5.86 (for DEF), indicating low influence of enzyme detoxification processes in fenpropathrin resistance.
机译：大型鳞茎植物（Acari：Phytoseiidae）是Tetranychus urticae Koch（Acari：Tetranychidae）的有效捕食者。这项研究的目的是研究抗原卟啉的稳定性以及与不同拟除虫菊酯的交叉抗性的关系，并评估增效剂[胡椒基丁醇盐（PBO），马来酸二乙酯（DEM）和S，S，S-三硫代磷酸三丁酯（DEF）]对这种前齿螨具有抗原苯丙氨酸敏感性的菌株。在实验室条件下，使用初始频率为75％和50％的抗螨虫的大型假单胞菌种群，研究了对原卟啉抗药性的稳定性。在长达12个月的时间内，每月评估一次对甲氰菊酯抗性螨的百分比。仅在最初的3-4个月内观察到电阻频率降低的趋势。在最初降低之后，显示出对原卟啉的抗性是稳定的，直到评估期结束之前，抗性频率都保持恒定（约30％）。使用对苯丙酸菊酯具有抗药性的易感菌株进行的毒性试验表明，苯丙酸菊酯与拟除虫菊酯联苯菊酯和溴氰菊酯之间具有很强的正交叉抗性。还使用增效剂DEM，DEF和PBO进行了生物测定。三个评估的增效剂（PBO，DEM，DEF）检测到的最大增效比（SR =无增效剂的LC50 /有增效剂的LC50）为5.86（对于DEF），表明酶解毒过程对甲氰菊酯抗性的影响较小。

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