Abstract
Side-effects of three commonly used pesticides in Iran were evaluated on an introduced strain of the predatory mite, Phytoseiulus persimilis Athias-Henriot, reared for about 10 years without exposure to any pesticides. Application of pesticides was carried out either to detached bean leaves using a Potter tower at 1 mg wet deposit per cm2 or by a hand sprayer on bean plants until run off. According to an EPPO decision making scheme, pirimiphos-methyl was found to be harmful (E = 90.8%) and heptenophos harmless (E = −3.7%) to the predatory mite in the residual initial toxicity tests. For determination of the hazard class of malathion a field test was found to be necessary (E = 59.8%). Categories of 1, 2, 3 were determined for heptenophos, malathion and primiphos-methyl, respectively, using IOBC classification. Despite being harmful, it is possible to use pirimiphos-methyl 10 days before release of P. persimilis. Investigation of the contribution of both lethal and sub-lethal effects to total impact indicated the dominance of lethality in the case of pirimiphos-methyl, while malathion acted by both mechanisms. Heptenophos did not have negative effects on fecundity of P. persimilis but rather caused a higher rate of fecundity in comparison with the control. The mortality found in the heptenophos test was not significantly different from the control.
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Kavousi, A., Talebi, K. Side-effects of three pesticides on the predatory mite, Phytoseiulus persimilis (Acari: Phytoseiidae). Exp Appl Acarol 31, 51–58 (2003). https://doi.org/10.1023/B:APPA.0000005127.42123.98
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DOI: https://doi.org/10.1023/B:APPA.0000005127.42123.98