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Effects of Cronartium ribicola on Soluble Sugars in Pinus monticola Bark. Bruce L. Welch, Biological Laboratory Technician, U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, Ogden, Utah 84401; Neil E. Martin, Plant Pathologist, stationed in Moscow, Idaho, at the Forestry Sciences Laboratory. Phytopathology 65:1025-1026. DOI: 10.1094/Phyto-65-1025.

Fructose, glucose, sucrose, and raffinose were the soluble sugars identified from Pinus monticola bark, and bark infected by Cronartium ribicola. There were no qualitative differences between the two types of tissue, but glucose, sucrose, raffinose, and total sugar content were significantly reduced in invaded bark. In contrast, fructose showed a nonsignificant reduction. Trace amounts of two polyols were detected within infected bark. The physiological implications of these findings are discussed.

Additional keywords: physiology of disease, blister rust.