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Ethanol in Douglas-fir with black-stain root disease (Leptographium wageneri)

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  • Diseased and healthy Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) were identified at two black-stain root disease centers, caused by Leptographium wageneri var. pseudotsugae Harrington & Cobb, in the Oregon Coast Range near Coos Bay. Phloem and sapwood near the root collar were sampled monthly for 1 year, whereas roots were sampled in October and November. Ethanol concentrations in sapwood of diseased trees near the root collar were 4–24 times higher than in healthy trees for all months of a year, except January and June. Roots from diseased trees in October had 5 times more ethanol in the phloem and 19 times more ethanol in the sapwood than corresponding tissue from healthy trees. Ethanol concentrations in roots from diseased trees in November were no different from October. Within trees, ethanol concentrations varied substantially among positions around the root collar and among different roots. Ethanol may play an important role in the biology of L. wageneri and beetle–pathogen interactions in Douglas-fir. Ethanol also may be useful in detecting stressed or diseased trees.
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  • Rick G. Kelsey and Gladwin Joseph. 1998. Ethanol in Douglas-fir with black-stain root disease (Leptographium wageneri). Can. J. For. Res. 28: 1207–1212.
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  • 28
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  • 8
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