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Root lesions in large loblolly pine (Pinus taeda L.) following inoculation with four root-inhabiting ophiostomatoid fungi

Matusick, G., Somers, G.L. and Eckhardt, L.G. (2011) Root lesions in large loblolly pine (Pinus taeda L.) following inoculation with four root-inhabiting ophiostomatoid fungi. Forest Pathology, 42 (1). pp. 37-43.

Link to Published Version: http://dx.doi.org/10.1111/j.1439-0329.2011.00719.x
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Abstract

Loblolly pine decline, characterized by deteriorating root systems leading to shortening and thinning of foliage, has been observed throughout portions of the south-eastern United States. Several root-inhabiting ophiostomatoid fungi, including Leptographium procerum, Leptographium terebrantis, Leptographium serpens, and Grosmannia huntii are associated with lateral root damage on declining loblolly pine. Trees of various ages were inoculated in primary lateral roots during fall (2006 and 2007) and spring (2007 and 2008). All fungi caused a darkened, resin-filled lesion on the surface of the phloem, extending into the xylem that was larger than that of controls. Only lesions associated with G.similar to huntii infection were significantly larger in the spring season, compared with the fall. Grosmannia huntii was found to be the most virulent fungus, causing lesions that were longer, deeper and larger than all other fungal species during the spring and larger than L.similar to terebrantis and L.similar to procerum in the fall. Leptographium serpens was the second most virulent fungal species, causing lesions larger than L.similar to procerum and L.similar to terebrantis (with the exception of lesion depth) during both seasons. These tests indicate that G.similar to huntii and L.similar to serpens are significant root pathogens, capable of causing considerable damage, while L.similar to terebrantis and L.similar to procerum may be less virulent. Depending on the actions of their vectors, G.similar to huntii and L.similar to serpens may be responsible for significant root deterioration and tree disease.

Publication Type: Journal Article
Murdoch Affiliation: Centre of Excellence for Climate Change and Forest and Woodland Health
School of Biological Sciences and Biotechnology
Publisher: Blackwell Publishing
Copyright: © 2011 Blackwell Verlag GmbH
URI: http://researchrepository.murdoch.edu.au/id/eprint/7039
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