Suppression of basal sprout development in Pyrus calleryana Decne. ‘Bradford’ was achieved with naphthaleneacetic acid (NAA) applied as a dormant, directed trunk spray. Nearly complete sprout control was achieved with all test rates (2875 to 11,500 ppm) through 120 days after treatment (DAT), with a slight increase in total sprout number occurring between 120 and 210 DAT. The 5750 ppm rate provided optimal sprout control and resulted in 15% more increase in tree height and 20% more increase in caliper than in control trees. No phytotoxicity was observed on trees in any treatment.

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Author notes

2Professor of Horticulture.

3Associate Superintendent, Ornamental Horticulture Substation, Mobile, AL 36689.

4Assistant Professor of Horticulture, University of Tennessee, Knoxville, TN 37901.