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Pathogenicity of Leptographium Species Associated with Loblolly Pine Decline

November 2004 , Volume 88 , Number  11
Pages  1,174 - 1,178

L. G. Eckhardt , Former Graduate Student , and J. P. Jones , Professor, Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803 ; and K. D. Klepzig , Entomologist, United States Department of Agriculture, United States Forest Service, Southern Research Station, Pineville, LA 71360

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Accepted for publication 18 May 2004.

Freshly lifted seedlings and 21-year-old trees of loblolly pine were wound-inoculated with Leptographium species recovered from the soil and/or roots of trees with loblolly decline symptoms in central Alabama. Seedlings inoculated with L. procerum in the greenhouse produced significantly fewer root initials and a smaller root mass than control seedlings. Vertical lesions produced in seedlings by L. serpens and L. terebrantis were significantly longer than in controls. Lesions produced in mature trees by L. serpens and L. lundbergii were significantly longer than in controls. Of the fungi tested, L. serpens, L. terebrantis, and L. lundbergii were the most aggressive and may pose the greatest threat to loblolly pines.

Additional keywords: root disease, root feeding insects

© 2004 The American Phytopathological Society