The attractant response of Ips confusus to frass produced by male beetles boring in ponderosa pine can be reproduced, in a laboratory bioassay, by a combination of compound I with either compound II or compound III, all isolated from frass. The same response by both sexes was elicited by mixtures of synthesized compounds. Compound I is (—)-2-methyl-6-methylene-7-octen-4-ol; compound II, (+)- cis - verbenol; and compound III, (+)-2-methyl-6-methylene-2,7-octadien-4-ol.
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Silverstein et al. (1966) studied this question.
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