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Fusiform Rust Gall Formation and Cytokinin of Loblolly Pine. S. J. Rowan, Plant Pathologist, Southeastern Forest Experiment Station, Forest Service, USDA, Athens, Georgia 30601. Phytopathology 60:1225-1226. Accepted for publication 18 March 1970. DOI: 10.1094/Phyto-60-1225.

Cytokinin activity was 10 times greater in fusiform rust gall tissue than in noninfected tissue of loblolly pine. This increase of cytokinin activity in gall tissue suggests that cytokininlike compounds play a significant role in gall formation.

Additional keywords: Pinus taeda, Cronartium fusiforme, physiology of disease.