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The objective of this work was to evaluate the soybean neotropical brown stink bug (Euschistus heros) resistance to methamidophos through laboratory bioassays. Bioassays were carried out using populations of adults and nymphs of Euschistus heros in the last instar collected in soybean crops in Paraná State. Highest frequencies of genotypes resistant to methamidophos were observed in Alvorada do Sul, Toledo and Nova Santa Rosa, PR. Populations from Bela Vista do Paraíso, Araruna, Campo Mourão, Mariluz, Cascavel, São João do Ivaí, and Mamboré were more susceptible to methamidophos. However, an increase on resistant genotypes in this locations cannot be discarded. O objetivo deste trabalho foi avaliar a resistência de populações do percevejo-marrom (Euschistus heros) da soja ao metamidofós por meio de bioensaios em laboratório. Bioensaios foram realizados com populações de adultos e ninfas de último instar de Euschistus heros coletadas em lavouras de soja do Estado do Paraná. As maiores frequências de genótipos resistentes ao metamidofós foram obtidas em Alvorada do Sul, Toledo e Nova Santa Rosa. As populações de Bela Vista do Paraíso, Araruna, Campo Mourão, Mariluz, Cascavel, São João do Ivaí e Mamboré foram mais suscetíveis ao metamidofós. No entanto, o incremento incipiente de genótipos resistentes nesses locais não deve ser desconsiderado

Neotropical brown stink bug (Euschistus heros) resistance to methamidophos in Paraná, Brazil