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Effects of age and population density on response to beetle and food volatiles by oryzaephilus surinamensis and oryzaephilus mercator coleoptera cucujidae



Effects of age and population density on response to beetle and food volatiles by oryzaephilus surinamensis and oryzaephilus mercator coleoptera cucujidae



Environmental Entomology 12(5): 1367-1374



By use of a 2-choice laboratory bioassay, olfactory response to beetle and frass volatiles [including pheromones] was assessed in O. surinamensis (L.) and O. mercator (Fauvel) [stored product pest] of known age and mixed sex from cultures held at various adult population densities. Four- to 6-wk-postemergent O. surinamensis from dense laboratory cultures (.apprx. 40,000 beetles/kg of medium) did not respond to, or were repelled by, Porapak Q-captured volatiles from beetles frass, rolled oats and brewer's yeast. When culture density was lowered to 1000 beetles/kg or when beetles > 2 mo. posteclosion were tested, positive olfactory response to test volatiles progressively developed. Recently eclosed O. surinamensis from low-density cultures exhibited a period of negative attraction or no significant response to test volatiles, followed by a gradual increase in positive response. For O. mercator maintained in moderately crowded cultures (10,000 beetles/kg), positive olfactory response to beetle and frass volatiles developed during the week after adult eclosion.

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Accession: 005288734

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