J. Appl. Entomol. ORIGINAL CONTRIBUTION Field response of the six-toothed pine bark beetle, Ips sexdentatus (Col.: Curculionidae, Scolytinae), to pheromonal blend candidates I. Etxebeste1,G.A´ lvarez1,G.Pe´ rez2 & J. A. Pajares1 1 Sustainable Forest Management Research Institute, University of Valladolid -INIA, Palencia, Spain 2 Calabazanos Forest Health Centre, Junta de Castilla y Leo´ n, Palencia, Spain Keywords Abstract bark beetle predators, 2-methyl-3-buten-2-ol, cis-verbenol, ipsdienol, ipsenol, myrtenol The identification and description of the chemical signals involved in the aggregation of bark beetles may lead to the development of inte- Correspondence grated pest management strategies using synthetic pheromones. Ips sex- In˜ aki Etxebeste (corresponding author), dentatus Boern. (Col.: Scolytinae) colonizes trees of the Pinus genus Sustainable Forest Management Research across Europe, causing severe damage in occasions. The effect of cis-ver- Institute, University of Valladolid-INIA, Avd. benol, ipsenol, 2-methyl-3-buten-2-ol (MB) and myrtenol in relation to Valladolid 44, 34004 Palencia, Spain. E-mail:
[email protected] the major pheromonal compound ipsdienol on the aggregation behav- iour of I. sexdentatus was studied on four field bioassays. The ternary Received: June 19, 2011; accepted: September blend of racemic ipsdienol, cis-verbenol and racemic ipsenol consistently 22, 2011. caught the highest number of bark beetles, resulting in large standard- ized mean differences (dunbiased > 0.8). The binary blends between ips- doi: 10.1111/j.1439-0418.2011.01682.x dienol and ipsenol, and ipsdienol and cis-verbenol also improved the performance of ipsdienol, although only ipsenol did it significantly. On the other hand, catches were reduced (dunbiased = )0.96) when MB was released along ipsdienol, although the effect was found to be non-signif- icant.