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Assessment of sublethal effects of spirodiclofen on biological performance of the predatory mite, Amblyseius swirskii

Alinejad, Marzieh, Kheradmand, Katayoon, Fathipour, Yaghoub
Systematic and applied acarology 2016 v.21 no.3 pp. 375-384
Amblyseius swirskii, Tetranychus urticae, integrated pest management, life tables, oviposition, predatory mites, progeny, spirodiclofen, sublethal effects
An understanding of the impact of acaricides on predatory mites is crucial for integrated pest management (IPM) programs. The present study evaluated the sublethal effect of spirodiclofen on life table parameters of the subsequent generation of the predatory mite, Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae) fed on Tetranychus urticae Koch under laboratory conditions. The sublethal concentrations LC₁₀, LC₂₀ and LC₃₀ were determined based on a dose-effect assay. Exposure to the sublethal concentrations of spirodiclofen had no significant effects on developmental time of offspring of treated mites. Compared with LC₁₀ treatment, the oviposition period of treated mites with LC₂₀ and LC₃₀ concentrations decreased significantly. The intrinsic rate of increase (r), finite rate of increase (λ) and net reproductive rate (R₀) were not affected by sublethal concentration. Our results suggest that sublethal concentrations of spirodiclofen may not affect the population parameters of offspring from treated A. swirskii.