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.
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El-Banhawy, E., Amer, S. & Saber, S. Induction of a malathion-resistant strain in the common predacious mite Amblyseius cydnodactylon (Acari: Phytoseiidae) . Anz. Schädlingskunde/J. Pest Science 73, 22–24 (2000). https://doi.org/10.1046/j.1439-0280.2000.00022.x
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DOI: https://doi.org/10.1046/j.1439-0280.2000.00022.x