IPS TRIDENS (COLEOPTERA: SCOLYTIDAE) ATTRACTED BY IPSDIENOL PLUS CIS-VERBENOL

Publisher Website
Google Scholar
Abstract
Norwegian pipe traps, used with pheromones to mass-trap Ips typographus (L.) in Scandinavia, were used in central British Columbia to determine whether any native beetles would respond to the pheromone of I. typographus. The spruce-infesting Ips tridens (Mannerheim) was the only species captured. Traps baited with “Ipslure” packets (1400 mg 2-methyl-3-buten-2-ol, 70 mg (S)-(−)-cis-verbenol, 15 mg racemic ipsdienol), ipsdienol, or ipsdienol plus cis-verbenol, caught significantly more beetles than unbaited traps. cis-Verbenol, which attracted no beetles when used alone, acted synergistically when added to ipsdienol. Methylbutenol used alone was no more attractive to beetles than the control, and inhibited the response of female beetles when added to traps baited with ipsdienol or ipsdienol plus cis-verbenol. Ipsenol alone attracted no beetles. The sex ratios of responding beetles (mean 1 male: 7.15 females) did not differ among treatments, but all differed significantly from the ratio of 1 male: 3.12 female beetles emerging from naturally infested spruce bolts.