Abstract
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 38-32 C for three Nebraska isolates.

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