01650nam a2200229   4500008004100000020002200041245008500063210006900148300001200217520093700229653001701166653000801183653001501191653001301206653001201219653001701231100002001248700001801268700001801286700001301304856010301317       2011                        eng d  a978-3-642-17814-600aChemical Ecology of Bark Beetles in Regard to Search and Selection of Host Trees0 aChemical Ecology of Bark Beetles in Regard to Search and Selecti  a150-1903 aBark beetles (Coleoptera: Scolytidae), especially pests in the genera Dendroctonus, Ips, Scolytus, Trypodendron, Tomicus, and Pityogenes of the Northern hemisphere are reviewed regarding aspects of their chemical ecology during host finding and selection. Most of the species covered here feed on conifers, primarily pines (Pinus) in the Northern hemisphere and Norway spruce (Picea abies) of Europe and Asia. Bark beetles use a variety of olfactory strategies to discriminate suitable host trees from among less suitable, overcolonized, or decaying hosts as well as nonhosts. Bark beetles also use olfactory strategies to find mates and select attack sites. These strategies have implications for coevolution of trees and bark beetles. Knowledge of the chemical ecology of insect-insect and insect-plant relationships is necessary to develop improved methods for monitoring and controlling bark beetles that are predators of trees.10aDendroctonus10aIps10aPityogenes10aScolytus10aTomicus10aTrypodendron1 aByers, John, A.1 aZhang, Qinghe1 aLiu, Tongxian1 aKang, Le  uhttps://weevil.myspecies.info/chemical-ecology-bark-beetles-regard-search-and-selection-host-trees01910nas a2200241   4500008004100000020002500041245011300066210006900179260000900248300000900257490000900266520116700275653001801442653002401460100001901484700001801503700001601521700002001537700001701557700001901574700001901593856005601612       2012                        eng d  a0033-2615; 1687-743800aCoexistence and Competition between Tomicus yunnanensis and T. minor (Coleoptera: Scolytinae) in Yunnan Pine0 aCoexistence and Competition between Tomicus yunnanensis and T mi  c2012  a6pp.0 v20123 aCompetition and cooperation between bark beetles, Tomicus yunnanensis Kirkendall and Faccoli and Tomicus minor (Hartig) (Coleoptera: Scolytinae) were examined when they coexisted together in living Yunnan pine trees (Pinus yunnanensis Franchet) in Yunnan province in Southwest China. T. yunnanensis bark beetles were observed to initiate dispersal from pine shoots to trunks in November, while the majority of T. minor begins to transfer in December. T. yunnanensis mainly attacks the top and middle parts of the trunk, whereas T. minor mainly resides in the lower and middle parts of the trunk. The patterns of attack densities of these two species were similar, but with T. yunnanensis colonizing the upper section of the trunk and T. minor the lower trunk. The highest attack density of T. Yunnanensis was 297 egg galleries/m2, and the highest attack density of T. minor was 305 egg galleries/m2 . Although there was significant overlap for the same bark areas, the two species generally colonize different areas of the tree, which reduces the intensity of competition for the relatively thin layer of phloem-cambium tissues where the beetles feed and reside.10aTomicus minor10aTomicus yunnanensis1 aLu, Rong, Chun1 aWang, Hongbin1 aZhang, Zhen1 aByers, John, A.1 aJin, You, Ju1 aWen, Hai, Feng1 aShi, Wen, Jian  uhttp://www.hindawi.com/journals/psyche/2012/185312/01631nas a2200157   4500008004100000020002500041245014100066210006900207260000900276300000900285490000900294520106800303653002601371100002001397856005601417       2012                        eng d  a0033-2615; 1687-743800aBark Beetles, Pityogenes bidentatus, Orienting to Aggregation Pheromone Avoid Conifer Monoterpene Odors When Flying but Not When Walking0 aBark Beetles Pityogenes bidentatus Orienting to Aggregation Pher  c2012  a1-100 v20123 aPrevious studies and data presented here suggest that odors from healthy host Scotch pine (Pinus sylvestris) and nonhost Norway spruce (Picea abies), as well as major monoterpenes of these trees at natural release rates, significantly reduce the attraction of flying bark beetles, Pityogenes bidentatus, of both sexes to their aggregation pheromone components grandisol and cis-verbenol in the field, as tested by slow rotation of trap pairs. In contrast, P. bidentatusmales and females walking in an open-arena olfactometer in the laboratory did not avoid monoterpene vapors at release rates spanning several orders of magnitude in combination with aggregation pheromone. The bark beetle may avoid monoterpenes when flying as a mechanism for avoiding nonhost species, vigorous and thus unsuitable host trees, as well as harmful resinous areas of hosts. Inhibition of this dlight avoidance response in beetles after landing would allow them to initiate, or to find and enter, gallery holes with high monoterpene vapor concentrations inorder to feed and reproduce.10aPityogenes bidentatus1 aByers, John, A.  uhttp://www.hindawi.com/journals/psyche/2012/940962/