01962nas a2200157   4500008004100000020001400041245017900055210006900234260000900303300001200312490000700324520128500331653002901616100002401645856013501669       2012                        eng d  a0967-087400aFeeding habits of Pityogenes chalcographus (L.) (Coleoptera: Scolytinae) on Norway Spruce (Picea abies) L. (Karst.) logging residues in wind-damaged stands in southern Poland0 aFeeding habits of Pityogenes chalcographus L Coleoptera Scolytin  c2012  a121-1300 v583 aThe effect of deposition of logging residues (e. g. cut branches and tree tops) on infestation density and reproductive efficiency of the smaller European (six-toothed) spruce bark beetle, Pityogenes chalcographus (L.) (Coleoptera: Scolytinae), was studied on Norway Spruce (Picea abies) L. (Karst.) stands in southern Poland. It was found that such materials, originating from windbreaks and windfalls and spread loosely over the forest floor, were more readily infested by P. chalcographus than materials gathered in piles. However, the beetles achieved a significantly higher reproductive efficiency (number of new generation beetles per each parent individual) on branches in piles than on those spread loosely. In piles, the P. chalcographus infestation density, measured as the total number of individuals per square decimetre of bark area, and reproductive efficiency varied, depending on the location of the branches in a pile. The most favourable breeding conditions occurred in the middle layer of a pile. It was also found that at different infestation densities the method and placement of woody debris deposition did not affect the number of beetles that emerged. These results are discussed in the context of using logging residues as natural traps for bark beetles.10aPityogenes chalcographus1 aKacprzyk, Magdalena  uhttps://weevil.myspecies.info/feeding-habits-pityogenes-chalcographus-l-coleoptera-scolytinae-norway-spruce-picea-abies-l-karst-lo02195nas a2200205   4500008004100000020002500041245015200066210006900218260000800287300001200295490000700307520138600314653002901700100002201729700003201751700001901783700002301802700002901825856013501854       2012                        eng d  a1286-4560; 1297-966X00aLack of genetic differentiation after host range extension argues for the generalist nature of Pityogenes chalcographus (Curculionidae: Scolytinae)0 aLack of genetic differentiation after host range extension argue  cApr  a313-3230 v693 aThe bark beetle, Pityogenes chalcographus, is one of the main pests in Picea abies stands, and it has also been found on other European Pinaceae species. With massive introductions of North American conifer species into European forests, this insect has extended its host range to exotic Pinaceae species. This study assessed whether a wider host range has influenced the genetic structure of P. chalcographus and has led to host specialization. Insects were collected from two different regions of France, where eight native and exotic conifer species coexist and were analyzed using mitochondrial and nuclear genetic markers. Considerable haplotypic diversity was observed within the regions and within host species from where P. chalcographus populations were collected. No genetic differentiation, especially with respect to host species associations, could be detected. Moreover, no relationship could be established between closely related P. chalcographus haplotypes and taxonomically related conifer species. The capacity of P. chalcographus for host shifting and dispersal may have played a key role in the rapid extension of its host range. These findings are important for pest management in forests and health and phytosanitary measures in the timber trade, especially for risk assessment in mixed coniferous forests including tree species of major economic importance.10aPityogenes chalcographus1 aBertheau, Coralie1 aBankhead-Dronnet, Stephanie1 aMartin, Carine1 aLieutier, Francois1 aRoux-Morabito, Geraldine  uhttps://weevil.myspecies.info/lack-genetic-differentiation-after-host-range-extension-argues-generalist-nature-pityogenes-chalcogr01631nas 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/