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Ecology and Epidemiology

Thyronectria Canker of Honeylocust: Influence of Temperature and Wound Age on Disease Development. Jerry W. Riffle, Research plant pathologist, U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, Forestry Sciences Laboratory, University of Nebraska, Lincoln 68583; Glenn W. Peterson, research plant pathologist, U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, Forestry Sciences Laboratory, University of Nebraska, Lincoln 68583. Phytopathology 76:313-316. Accepted for publication 2 October 1985. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1986. DOI: 10.1094/Phyto-76-313.

The number of days for three isolates of Thyronectria austro-americana to girdle stems and wilt foliage of 20-wk-old seedlings of Gleditsia triacanthos decreased as temperatures increased from 16 to 28 C. Inoculation of freshly made wounds, and 7-, 14-, and 21-day-old wounds with T. austro-americana produced cankers on 100, 62, 10, and 6% of the seedlings, respectively. Growth in culture was optimum at 28-32 C for three Nebraska isolates.