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Fungi associated with the North American spruce beetle, Dendroctonus rufipennis

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Fungi were isolated from individual Dendroctonus rufipennis (Kirby) collected from six populations in Alaska, Colorado, Utah, and Minnesota, U.S.A. In all populations, Leptographium abietinum (Peck) Wingfield was the most commonly isolated mycelial fungus (91–100% of beetles). All beetles in all populations were associated with yeasts and some with only yeasts (0–5%). In one population, Ophiostoma ips (Rumbold) Nannf. was also present on 5% of the beetles but always in combination with L. abietinum and yeasts. Ophiostoma piceae (Munch) H. & P. Sydow was found on 2% of beetles in another population. Ceratocystis rufipenni Wingfield, Harrington & Solheim, previously reported as an associate of D. rufipennis, was not isolated from beetles in this study. Ceratocystis rufipenni is a virulent pathogen of host Picea, which has led to speculation that C. rufipenni aids the beetle in overcoming tree defenses and therefore contributes positively to the overall success of the beetle during colonization. However, our results, considered along with those of others, indicate that C. rufipenni may be absent from many populations of D. rufipennis and may be relatively rare in those populations in which it is found. If this is true, C. rufipenni may be only a minor or incidental associate of D. rufipennis and, as such, not likely to have significant impacts on beetle success or population dynamics. Alternatively, the rarity of C. rufipenni in our and others isolations may be due to difficulties in isolating this fungus in the presence of other faster growing fungi such as L. abietinum.

Des champignons ont été isolés sur des dendroctones (Dendroctonus rufipennis Kirby) capturés dans six populations provenant de l'Alaska, du Colorado, de l'Utah et du Minnesota aux États-Unis. Dans toutes les populations, Leptographium abietinum (Peck) Wingfield était le champignon le plus communément isolé (91–100 % des dendroctones). Tous les dendroctones dans toutes les populations étaient associés à des levures et certains seulement à des levures (0–5 %). Dans une population, Ophiostoma ips (Rumbold) Nannf. était également présent sur 5 % des dendroctones mais toujours en association avec L. abietinum et des levures. Ophiostoma piceae (Munch) H. & P. Sydow a été isolé sur 2 % des dendroctones dans une autre population. Ceratocystis rufipenni Wingfield, Harrington & Solheim, déjà mentionné comme étant associé à D. rufipennis, n'a pas été isolé des dendroctones dans cette étude. Ceratocystis rufipenni est un pathogène virulent du genre Picea, ce qui a donné naissance à l'idée que C. rufipenni pouvait aider le dendroctone à vaincre les défenses de l'arbre et par conséquent contribuer positivement au succès global du dendroctone lors de la colonisation. Cependant, nos résultats considérés avec ceux d'autres chercheurs indiquent que C. rufipenni est probablement absent dans plusieurs populations de D. rufipennis et relativement rare dans les populations où il est retrouvé. Si cela est vrai, C. rufipenni pourrait être associé à D. rufipennis de façon marginale et accessoire et comme tel n'aurait vraisemblablement pas d'impact majeur sur la dynamique de population et le succès du dendroctone. Par contre, la rareté de C. rufipenni dans nos isolations et les isolations d'autres chercheurs pourrait être due à la difficulté d'isoler ce champignon en présence d'autres champignons qui croissent rapidement comme L. abietinum.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2003-09-01

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