Induction of a malathion-resistant strain in the common predacious mite Amblyseius cydnodactylon (Acari: Phytoseiidae)

By E. M. El-Banhawy, S. A. A. Amer, S. A. Saber
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引用次数: 4

Abstract

Abstract: This study demonstrates a laboratory induction of a malathion - resistant strain in Amblyseius cydnodactylon Shehata & Zaher and effect of selection on reproduction. Initially 500 sensitive females obtained from a laboratory mass culture were exposed to malathion at LC70. Subsequent selections were conducted every two generations at progressive LC70 values and number of eggs/female/day was recorded at each selection. Experiments were carried out under laboratory conditions of 24-28°C and 70-80 % R. H. The LC70 in the parent generation was 5.19 ppm and increased to 20 ppm in F4 selection generation. The dosage mortality relationships continued to increase up to a maximum of 282.3 ppm in F16. The rate of developing resistance increased from 1.75 folds in F2 to 1.97 folds in F4 and gradually reached a maximum of 54.39 folds in F16. There was an obvious decrease in reproduction corresponded to increasing resistance. For example, the number of eggs/female/day in F 16 was 8 eggs, contrasting 3 eggs in the parent generation.

在常见捕食性螨Amblysius cydnodactylon(Acari:Phytoseidae)中诱导马拉硫磷抗性菌株
摘要:本研究证明了一株马拉硫磷抗性菌株的实验室诱导;Zaher和选择对生殖的影响。最初,从实验室大规模培养中获得的500只敏感雌性暴露于LC70的马拉硫磷。随后的选择每两代以渐进的LC70值进行一次,并在每次选择时记录每雌/天的卵子数量。实验在24-28°C和70-80%R.H.的实验室条件下进行。亲本代的LC70为5.19ppm,在F4选择代中增加到20ppm。剂量-死亡率关系在F16中继续增加,最高可达282.3ppm。抗性发生率从F2的1.75倍增加到F4的1.97倍,F16逐渐达到最大值54.39倍。随着抗性的增加,繁殖量明显减少。例如,F16的卵子数/雌/天为8个,而亲本为3个。
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