Monitoramento da suscetibilidade de Euschistus heros (Fabr. 1794) (Heteroptera : Pentatomidae) a inseticidas em Mato Grosso

Abstract

Euschistus heros is considered the most abundant species among the stink bugs in crops in Brazil, which may cause severe damage to the productivity and quality of the seeds. The repeated use of molecules with the same mode of action to control this insect favors selecting individual resistant individuals to insecticides. Aiming to evaluate the susceptibility of populations of E. heros, populations from Sinop, Nova Mutum and Rondonopolis were collected. First of all, susceptibility curves in a laboratory susceptible population were determined in order to establish diagnostic doses to monitor the susceptibility of populations of E. heros to Thiamethoxam, Imidacloprid, betacyfluthrin and Lambda-cyhalothrin. Regarding the toxocity of the assayed molecules, Thiamethoxam was the most toxic to E. heros, while the betacyfluthrin had the lowest toxicity (68x lower than Thiametoxam). As result of the bioassays, we concluded that all populations tested behaved as susceptible to the tested molecules.