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Net Photosynthesis, Growth, and Transpiration in American Elm Seedlings as Influenced by Dutch Elm Disease and Plant-Water Stress. Bruce R. Roberts, Plant Physiologist, Plant Science Research Division, ARS, USDA, P.O. Box 365, Delaware, Ohio 43015; Phytopathology 62:457-459. Accepted for publication 7 December 1971. DOI: 10.1094/Phyto-62-457.

Young American elm seedlings were inoculated with the Dutch elm disease pathogen or subjected to plant-water stress prior to measuring net photosynthesis, growth, and transpiration for a period of 5 weeks. Both treatments resulted in depressed growth when compared to untreated controls. The data for net photosynthesis and transpiration suggest that the pattern of symptom development in inoculated seedlings is different from plants experiencing an internal moisture deficit.