Abstract
Knowledge of inter and intra-specific variation in the susceptibility of natural enemies to pesticides could help to better design integrated pest management strategies. The objective of this research was to evaluate the susceptibility to deltamethrin in populations of the predatory mites Neoseiulus californicus (McGregor) and Phytoseiulus macropilis (Banks) populations collected from protected ornamental crops in Brazil. The susceptibility to deltamethrin was characterized against immature and adult stages of both species. The impact of this insecticide was also measured by estimating the intrinsic rate of increase (r i). The immature and adult stages of N. californicus were approximately 3,600 and 3,000-fold more tolerant to deltamethrin than those of P. macropilis. However, high variability in the susceptibility to this insecticide was detected among P. macropilis populations, with resistance ratios of up to 3,500-fold. The selection of deltamethrin-resistant strains of P. macropilis could be exploited in applied biological control programs.
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Acknowledgments
We thank Mário E. Sato (Instituto Biológico, Campinas, São Paulo State, Brazil) for providing N. californicus population and Gilberto J. de Moraes (University of Sao Paulo, Piracicaba, São Paulo State, Brazil) for confirming the taxonomic identification of P. macropilis populations. We also thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for providing scholarship and financial support for this research.
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Poletti, M., Omoto, C. Susceptibility to deltamethrin in the predatory mites Neoseiulus californicus and Phytoseiulus macropilis (Acari: Phytoseiidae) populations in protected ornamental crops in Brazil. Exp Appl Acarol 58, 385–393 (2012). https://doi.org/10.1007/s10493-012-9588-z
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DOI: https://doi.org/10.1007/s10493-012-9588-z