| Summary: | The potential of insecticides that affect the growth and insect development to control <i>Euprosterna elaeasa</i> was evaluated. Fenoxycarb, methoxyfenozide, pyriproxyfen, and tebufenozide were assessed against <i>E. elaeasa</i> larvae for toxicity, survivorship, and feeding inhibition in the laboratory, and mortality in semifield conditions. Concentration–mortality bioassays demonstrated that insect growth regulators (IGRs) have a lethal effect on this insect, with pyriproxyfen (LC<sub>50</sub> = 0.141 g L<sup>−1</sup>) being the most effective, followed by fenoxycarb (LC<sub>50</sub> = 0.199 g L<sup>−1</sup>), methoxyfenozide (LC<sub>50</sub> = 0.233 g L<sup>−1</sup>), and tebufenozide (LC<sub>50</sub> = 0.259 g L<sup>−1</sup>). The survival rate was 99.8% in the control group, compared to 44.6%, 42.9%, 42.2%, and 39.5% in insects treated with pyriproxyfen, fenoxycarb, methoxyfenozide, and tebufenozide, respectively. IGRs caused feeding inhibition in <i>E. elaeasa</i> larvae 3 h after exposure. Furthermore, mortality in semifield conditions was similar to the results found in the laboratory. Our findings suggest that fenoxycarb, methoxyfenozide, pyriproxyfen, and tebufenozide are effective against <i>E. elaeasa</i> and, therefore, we confirm the potential of these IGRs for the control of this pest.
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