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Fusiform Rust Gall and Canker Formation and Phenols of Loblolly Pine. S. J. Rowan, Plant Pathologist, Southeastern Forest Experiment Station, Forest Service, USDA, Athens, Georgia 30601. Phytopathology 60:1221-1224. Accepted for publication 18 March 1970. DOI: 10.1094/Phyto-60-1221.

Heartwood area and heartwood phenols increase with increasing diam, age, and sp gr in fusiform rust galls on loblolly pine. This increase occurs as water-conducting tissue decreases, indicating that this heartwood is relatively impermeable to water and may inhibit water transport. The orthodihydroxy and heartwood phenols of gall wood differ quantitatively, rather than qualitatively, from those in noninfected wood. The phenols in water-extracted n-butanol fractions of gall wood differ quantitatively and qualitatively from those in noninfected wood. These and other modifications caused by Cronartium fusiforme infection of pine stems, as well as their possible relation to gall and canker formation, are discussed.

Additional keywords: Pinus taeda, physiology of disease.