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Green leaf volatiles interrupt aggregation pheromone response in bark beetles infesting southern pines
Authors:J C Dickens  R F Billings  T L Payne
Institution:(1) Agricultural Research Service, Boll Weevil Research Unit, U. S. Department of Agriculture, 39762 Mississippi State, (Mississippi), (USA);(2) Texas Forest Service, Pest Control Section, 75 901 Lufkin, (Texas), (USA);(3) Department of Entomology, Virginia Polytechnic Institute and State University, 24 061 Blacksburg, (Virginia), (USA)
Abstract:Summary Green leaf volatiles were shown to interrupt responses to aggregation pheromones of three species of bark beetles (Coleoptera: Scolytidae) which infest pines in the southern United States the southern pine beetle,Dendroctonus frontalis Zimm.; the four-spined engraver,Ips avulsus (Eichhoff); and the five-spined engraver,Ips grandicollis (Eichhoff)]. The order of effectiveness of the compounds tested for each species was hexanal>hexanal+hexan-1-ol>hexan-1-ol. Neither hexanal, hexan-1-ol nor hexanal+hexan-1-ol was as effective in interrupting pheromone responses ofD. frontalis as verbenone, a known inhibitor of this species. Other than interspecific chemical signals, this is the first report of an interruptant forIps species, and the only report of a pheromone interruptant active for bothIps andDendroctonus species.
Keywords:Inhibitor  antiaggregation pheromone  bark beetle  green leaf volatile  Dendroctonus frontalis  Ips avulsus  Ips grandicollis
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