Abstract
Research on host selection by bark and wood boring insects has concentrated on flight orientation behavior. Less is known of the factors that govern the steps successive to host landing. Here, we discuss chemical factors involved in host acceptance by bark beetles and a new microassay. Adult males and females of Ips typographus were offered an artificial diet treated with various concentrations of different plant-derived compounds (host terpenes and nonhost compounds) in a no-choice mode. Beetles were tested individually in a glass tube for 4 hr, and the length of feeding was measured and compared to a control (diet with only solvent). The first effect was diet rejection, especially when nonhost compounds were tested at high concentrations. Most compounds reduced feeding, in proportion to concentration. Females were fed more readily than males after addition of both host and nonhost compounds. Diet removal was significantly affected by all the tested factors (sex, compound, dose) as well as by their interactions. With increased concentrations, males were more responsive than females to antifeedants, as all compounds (except juglone) showed clear sex differences of diet consumption. 3-Octanol, 1-hexanol, and a Green Leaf Volatile (GLV)-blend (three C6 alcohols) showed the strongest antifeedant effects, which started at a low dose (0.1%) and had a low Effective Dose 50 (ED50, 0.3–1%). In contrast, host monoterpenes, limonene and α-pinene, inhibited feeding at high doses (10–30%) only with ED50 > 10%. The highest Antifeedant Indexes (AFIs) were shown by verbenone, carvone, and 1-hexanol (0.90–1.00). Both host and nonhost compounds inhibited feeding at some concentration. No significant stimulation of feeding by any host compound at concentrations reported in the literature as optimal were found, with the possible exception of α-pinene at low concentrations in females.
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Acknowledgments
We thank L. Ansebo, M. Tasin, F. Loreto, and S. Larsson for comments on earlier drafts, the Björnstorp Estate for provision of logs, and E. V. Jirle for cutting stems for beetle breeding. The authors are also grateful to the Chemical Ecology Section of the Department of Crop Sciences, SLU (Alnarp, Sweden) for providing facilities and laboratories.
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Faccoli, M., Blaženec, M. & Schlyter, F. Feeding Response to Host and Nonhost Compounds by Males and Females of the Spruce Bark Beetle Ips typographus in a Tunneling Microassay. J Chem Ecol 31, 745–759 (2005). https://doi.org/10.1007/s10886-005-3542-z
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DOI: https://doi.org/10.1007/s10886-005-3542-z