02195nas 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-chalcogr