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Fungal colonization of aspen roots following mechanical site preparation

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Abstract:

Fungal colonization of aspen (Populus tremuloides Michx.) roots was examined in boreal mixedwood sites that were mechanically site prepared 8–10 years earlier for white spruce (Picea glauca (Moench) Voss) regeneration using disc trenchers or ripper plows. A survey of root wounds determined that Armillaria sinapina Bérubé & Dessureault and Armillaria ostoyae (Romagn.) Herink were both wound pathogens of aspen; however, A. sinapina was more frequently associated with wounds than was A. ostoyae. Armillaria ostoyae was more common on unwounded root tissues. Sixty percent of wounds infected by A. sinapina were not compartmentalized and the likelihood of an A. sinapina infection did not increase with increasing wound size. Pathogenic fungi other than Armillaria were rarely associated with root wounds. Sever wounds were associated with furrows; scrape wounds were located both along and between furrows irrespective of the site-preparation technique (ripper plow vs. disk trencher).

La colonisation des racines de peuplier faux-tremble (Populus tremuloides Michx.) par les champignons a été étudiée en forêt boréale mélangée dans des sites qui avaient subi une préparation mécanique à l'aide de trancheuses à disques ou de dessoucheuses à griffe 8 à 10 ans plus tôt pour favoriser la régénération de l'épinette blanche (Picea glauca (Moench) Voss). Un relevé des blessures aux racines a permis de déterminer que Armillaria sinapina Bérubé & Dessureault et Armillaria ostoyae (Romagn.) Herink étaient tous deux des pathogènes de racines du peuplier faux-tremble. Cependant, A. sinapina était plus fréquemment associé aux blessures que A. ostoyae. Armillaria ostoyae était plus souvent présent dans les racines exemptes de blessures. Soixante pour cent des blessures infectées par A. sinapina n'étaient pas compartimentées et les probabilités d'une infection par A. sinapina n'augmentaient pas proportionnellement à la dimension des blessures. Des champignons pathogènes autres que Armillaria étaient rarement associés aux blessures aux racines. Les racines coupées étaient associées aux sillons; les racines éraflées étaient situées tant dans les sillons qu'entre ceux-ci peu importe la technique de préparation du site utilisée (dessoucheuse à griffe vs trancheuse à disques).[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2003

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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