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Armillariella mellea and Agrilus bilineatus and Mortality of Defoliated Oak Trees

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Dead, recently dead, dying, and living trees in areas defoliated by the gypsy moth, Lymantria dispar, were examined for the presence of the shoe-string fungus Armillariella mellea and the two-lined chestnut borer Agrilus bilineatus. Root systems were excavated with a front-end loader. A. mellea was established in the roots of one-third of the living trees examined. Colonization on trees with healthy crowns was limited to one or several small roots. On trees with half-dead crowns, the fungus had extensively colonized the roots and on many trees was present at the root collar. Both A. mellea and A. bilineatus were present in dead, recently dead, and dying trees. The roots of most of the recently dead or dying trees were extensively colonized by A. mellea, even though the fungus was not visible at the root collar. It is proposed that oak mortality results from an interaction of defoliation, A. mellea, and A. bilineatus. FOREST SCI. 23:485--492.

Keywords: Lymantria dispar; Quercus; gypsy moth; shoe-string fungus; two-lined chestnut borer

Document Type: Journal Article

Affiliations: Research Plant Pathologist at the Northeastern Forest Experiment Station, USDA Forest Service, Forest Insect and Disease Laboratory, Hamden, CT 06514

Publication date: 1977-12-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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