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چکیده
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Amblyseius swirskii Athias-Henriot, is one of the most important predatory mites that effectively regulate the herbivore mite populations as generalist predator. It is commonly used to suppress immature stages of thrips, whiteflies and various mite species. Since wide spread application of chemical pesticides usually negatively influence on biological control agents, in the present study the toxicities of two biorational compound, Biomite® and bifenazate acaricides were investigated on the adult stage of predatory mite, A. swirskii under laboratory conditions at 25 ± 1 º C, 65 ± 5 % RH and a photoperiod of 16L: 8D hours. Leaf discs (2 cm diameter) were dipped in each of specified concentrations of either acaricide for 30s and allowed to air dry for 1 hour under laboratory conditions. Then 15 young adult females of predatory mite were introduced on each leaf disc. Leaf discs were placed on moist cotton in a plastic Petri dish (6 cm diameter) with a ventilation hole (1 cm diameter) in the center of the lid covered by net. After 24 h exposure, the number of dead and survived females were recorded. Each bioassay consisted of five concentrations. The bioassays were replicated five times. Control leaf discs were dipped in distilled water only. The LC50 values of Biomite® and bifenazate were 1160 and 1201 μg a.i./mL, respectively. The LC50 values of tested acaricdes showed that they have low toxicity on A. swirskii predatory mites and may bee can be used in combination with this natural enemy in contest of IPM programs.
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