TOXICITY OF TERPENES SECRETED BY THE PREDATOR XYLOCORIS-FLAVIPES (REUTER) TO TRIBOLIUM-CASTANEUM (HERBST) AND ORYZAEPHILUS-SURINAMENSIS (L)
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abstract
Four terpene alcohols, linalool, geraniol, -terpineol, and nerol, which are compounds produced by Xylocoris flavipes (Reuter), were tested for toxicity against adults of Tribolium castaneum (Herbst) and Oryzaephilus surinamensis (L.) using a Petri dish assay. Dose-response studies were conducted for each compound singly and in a combination that mimicked the concentrations of these volatiles in exocrine secretions of X. flavipes. Linalool and -terpineol were toxic to T. castaneum in a dose-dependent fashion, but geraniol and nerol were not toxic during the 24 h bioassay. The mixture of the four compounds was several times less toxic than linalool and -terpineol for T. castaneum, even when exposed to large amounts. All four terpene alcohols and the mixture were toxic to O. surinamensis, with -terpineol proving most toxic and linalool the least toxic. Toxic effects of linalool and -terpineol against O. surinamensis occurred within very narrow ranges, suggesting the possibility of a threshold concentration. Variation in toxicity among similar compounds and between insect species for the same compounds should be examined in studies that assess terpenoids for toxicity against stored-product insects. 1995.
