Abstract
Performance evaluation of red maple (Acer rubrum L.) selections in the southeastern U.S. was initiated in November 1988. Seven cultivars, `Autumn Blaze', `Autumn Flame', `Morgan', `Northwood', `October Glory', `Franksred' (Red Sunset TM) and `Schlesingeri', from tissue culture and a group of seedlings obtained from a single source were container grown for 18 months prior to field planting in March 1990. All plants have received drip irrigation in the field. Since field planting, 'Autumn Flame', and 'Autumn Blaze' exhibit the greatest growth rate based on annual height and caliper data. 'Schlesingeri' and 'Northwood' had the least growth. Gas-exchange measurements taken in June 1992, showed 'Schlesingeri' and 'Northwood' to have the greatest photosynthetic activity and transpirational water loss while 'October Glory' and 'Frankred' had the least.
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