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The pine shoot beetle Tomicus piniperda as a plausible vector of Fusarium circinatum in northern Spain / Diana Bezos in Annals of Forest Science, vol 72 n° 8 (December 2015)  

Public [article]  inAnnals of Forest Science > vol 72 n° 8 (December 2015) . - pp 1079-1088 Titre : The pine shoot beetle Tomicus piniperda as a plausible vector of Fusarium circinatum in northern Spain Type de document : Article/Communication Auteurs : Diana Bezos, Auteur ; Pablo Martínez-Álvarez, Auteur ; Julio Javier Diez, Auteur ; Mercedes M. Fernández, Auteur Année de publication : 2015 Article en page(s) : pp 1079-1088 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] arbre (flore) [Termes IGN] Espagne [Termes IGN] maladie parasitaire [Termes IGN] parasite (biologie) [Termes IGN] Pinus radiata [Termes IGN] transmissibilité Résumé : (auteur) Key message: The pine shoot beetle, Tomicus piniperda, is a potential vector of the pitch canker disease pathogen. The insect could transmit the pathogenic fungus during its maturation or regeneration feeding on the shoots of healthy pine crowns. Context: Fusarium circinatum, the causal agent of pitch canker disease, currently affects Pinus radiata in northern Spain, causing pitch-soaked cankers and tree death. Although several species of the family Scolytinae have been reported as vectors of this pathogen, the role of the pine shoot beetle T. piniperda remains unclear. Aims: The general objective of this study was to determine whether T. piniperda is a vector for the pitch canker pathogen F. circinatum. For this purpose, Leach’s postulates (1) an association between T. piniperda and trees affected by pitch canker disease; (2) regular visits by T. piniperda to healthy P. radiata trees; (3) presence of the pathogen on the insect in nature; and (4) transmission of the pathogen to disease-free host material under controlled conditions. Methods: Fresh green shoots with feeding galleries were collected from the ground, breeding galleries were collected from diseased trunks and insects were collected during their dispersion flights. A laboratory experiment was conducted in which specimens of T. piniperda were inoculated with the pathogen prior to feeding on shoots. Results: In the field, T. piniperda was found to be associated with both diseased and healthy P. radiata trees, and F. circinatum was found to be present, at low rates, on the exoskeleton of T. piniperda. In the laboratory experiment, evidence of the ability of T. piniperda to transfer the pathogen to healthy shoots was found. Conclusions: The study findings indicate T. piniperda as a plausible vector of this pathogen. We postulate for the first time a potential relationship between the life cycles of T. piniperda and F. circinatum. Numéro de notice : A2015-899 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-015-0515-4 Date de publication en ligne : 09/09/2015 En ligne : https://doi.org/10.1007/s13595-015-0515-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79456 [article]

Towards standardised crown condition assessment in poplar plantations / Jorge Martín-García in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 308 Titre : Towards standardised crown condition assessment in poplar plantations Titre original : Améliorations en vue d'un suivi standardisé de l'état sanitaire des houppiers en plantations monoclonales de peuplier Type de document : Article/Communication Auteurs : Jorge Martín-García, Auteur ; Julio Javier Diez, Auteur ; Hervé Jactel, Auteur Année de publication : 2009 Article en page(s) : n° 308 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] houppier [Termes IGN] indicateur biologique [Termes IGN] Populus (genre) [Termes IGN] santé des forêts Résumé : (auteur) This work aims at developing new tools for rapid assessment of forest health indicators in poplar plantations. Crown transparency and discoloration were visually evaluated in all trees of four 15 m-radius sub-plots in 32 poplar clonal plantations, which were chosen according to a factorial scheme with three factors: tree age, site quality and understorey vegetation management. A subset of trees was assessed using digital photos processed with a semi-automatic image analysis system (the CROCO software) in order to compare visual and digital crown transparency estimates. Poplar crown conditions were better in young stands and rich sites. Harrowing understorey vegetation improved tree health in poor sites. Samples of 20 trees per stand provided the same information about crown transparency and discoloration as 60 trees. Calibration curves of digital crown transparency estimates were successfully fitted against visual crown transparency estimates. The same effects of stand age and site quality could be detected with digital crown transparency as response variable. The use of digital photos processed with CROCO in ca. twenty trees per stand is therefore recommended to accurately and objectively monitor crown condition in clonal poplar plantations. Numéro de notice : A2009-711 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2009006 Date de publication en ligne : 10/03/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/03/f08144/f08144.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72063 [article]