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Factors affecting survival of the merchant grain beetle (Coleoptera: Cucujidae) and the confused flour beetle (Coleoptera: Tenebrionidae) exposed to silica aerogel


Journal of Economic Entomology 82(3): 960-969
Factors affecting survival of the merchant grain beetle (Coleoptera: Cucujidae) and the confused flour beetle (Coleoptera: Tenebrionidae) exposed to silica aerogel
Mortality of Oryzaephilus mercator Fauvel exposed to 0.72 mg/cm2 silica aerogel (SG-67) bound to paper was directly related to length of exposure of the insects and length of time between exposure and placement in food. Exposures of 15 s killed 97% of starved adults in 2 d, but mortality was low if adults had access to food within 2 h. As exposure times increased, insects survived only if food was available at shorter intervals. Type and quantity of food also affected mortality. Mortality of O. mercator adults exposed to SG-67 was greater on bread crumbs and whole rolled oats than on ground rolled oats. Starved Tribolium confusum Jacquelin du Val required exposures of 6 h to SG-67 for complete mortality; the presence of food following exposure, rather than type or quantity, affected survival, although mortality was slightly higher on bread crumbs. Early larval instars of O. mercator and T. confusum were more susceptible than late instars, which responded to SG-67 in the same way as adults. Adults of both species exposed to SG-67 and subsequently held in inert cellulose powder died within 1-3 d, but many insects in ground rolled oats survived, probably because they had ingested and metabolized food and produced metabolic water. Adult O. mercator immobilized at 2.5 degrees C during exposure to SG-67 for 4 h, then held at 25 degrees C without food, were unaffected by the treatment. Exposures of O. mercator for 15-60 s to silica aerogel on an adhesive surface will effectively control these insects if they cannot find food immediately. T. confusum cannot be controlled with exposure times of less than 6 h.

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Accession: 001833461



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