The sublethal effects of deltamethrin on Trichogramma behaviors during the exploitation of host patches

► Trichogramma species are parasitoids of numerous species of Lepidoptera. ► Deltamethrin decreased the level of infestation of healthy host eggs. ► Deltamethrin increased the level of infestation of unsuitable, previously infested hosts. ► Deltamethrin increased antennal and ovipositor rejection of previously infested hosts. ► These effects may impact the equilibrium of natural ecosystems.