@article {9375,
	title = {Preference-performance relationship and influence of plant relatedness on host use by Pityogenes chalcographus L},
	journal = {Agricultural and Forest Entomology},
	volume = {11},
	number = {4},
	year = {2009},
	month = {November},
	pages = {389-396},
	abstract = {Pityogenes chalcographus L. (Coleoptera: Scolytinae) causes damage in European coniferous forests, primarily on Picea abies L. Karst., but is also recorded on other native and exotic Pinaceae species. Estimating the adequacy between adult preference and larval performance of this beetle among its host-range, as well as the influence of plant taxonomic relatedness on these parameters, would provide useful information on the beetle{\textquoteright}s ability to shift onto novel hosts.Choice and no-choice assays were conducted under laboratory conditions. Adult preference and larval performance parameters among two native (Pinus sylvestris L. and Picea abies) and three exotic north American (Pinus contorta Dougl., Picea sitchensis (Bong.) Carr. and Pseudotsuga menziesii Mirbel (Franco)) conifer species were measured.Pityogenes chalcographus exhibited a significant positive relationship between preference and performance. Picea abies was both the preferred and the most suitable host species for larval development. The closest relative, P. sitchensis, was the second best choice in terms of preference and performance. Pseudotsuga menziesii occupied an intermediate position for both beetle preference and performance, and Pinus spp. were the least suitable hosts for beetle development.Adult preference and larval performance ranking among hosts provides little support to the plant taxonomic relatedness hypothesis. Taxonomic relatedness could play a role on the diet breadth, although only at a limited scale, within the genus Picea. At higher taxonomic levels, other factors such as bark thickness might be decisive.},
	keywords = {Pityogenes chalcographus},
	isbn = {1461-9555},
	author = {Bertheau, Coralie and Salle, Aurelien and Roux-Morabito, Geraldine and Garcia, Jacques and Certain, Gregoire and Lieutier, Francois}
}
@article {9373,
	title = {Lack of genetic differentiation after host range extension argues for the generalist nature of Pityogenes chalcographus (Curculionidae: Scolytinae)},
	journal = {Annals of Forest Science},
	volume = {69},
	number = {3},
	year = {2012},
	month = {Apr},
	pages = {313-323},
	abstract = {The 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.},
	keywords = {Pityogenes chalcographus},
	isbn = {1286-4560; 1297-966X},
	author = {Bertheau, Coralie and Bankhead-Dronnet, Stephanie and Martin, Carine and Lieutier, Francois and Roux-Morabito, Geraldine}
}
