Nonstructural Carbohydrate Contents of Trees Affected with Texas Live Oak Decline. F. H. Tainter, Associate Professor, Department of Forestry, Clemson University, Clemson, SC 29631. R. Lewis, Jr., Pathologist, Southern Forest Experiment Station, P.O. Box 227, Stoneville, MS 38776. Plant Dis. 66:120-122. Accepted for publication 11 May 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-120.

Nonstructural carbohydrates were compared in previously wilted (declining) and healthy Quercus virginiana in central Texas in 1978. Total carbohydrate and reducing sugar contents were significantly greater in leaves and twigs of declining trees than in those of healthy trees. Starch content was also significantly greater in leaves but not in twigs of declining trees. However, total ethanolic extractives from both leaves and twigs were significantly greater in the healthy trees. Radial growth was significantly greater in healthy trees than in declining trees. Nonstructural carbohydrate content and radial growth were affected by the relative health of trees.

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