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In further oviposition studies, females laid fewer eggs in naturally infested pepper fruits in cage and small arena studies. A host marking pheromone responsible for the deterrence was identified in the oviposition plug and frass of female weevils. This compound or compounds are slightly polar with low volatility and are potential candidates for use in pest management programs. An investigation into the response of pepper weevil to host plant volatiles found that 10-d-old males and 2 and 10-d-old females oriented to the volatiles of three host plants (pepper, American black nightshade, and eggplant). Only 10-d-old males and females could perceive differences in volatile plumes, ignoring volatiles from non-host plants outside the Solanaceae. Ten-d-old males and females were also strongly attracted to pepper plants with actively feeding female weevils. It is hoped that by combining this knowledge of the deterrent pheromone and attractive plant volatiles, a new tool for pepper weevil pest management can be developed.