Abstract
Abstract Paclobutrazol (PBZ) was applied in one or more formulations as a basal trunk drench (0, 19, 38, 76, 152 mg·cm−2 trunk cross-sectional area) or orchard floor application (0, 52, 104, and 208 mg·cm−2 trunk cross-sectional area) to 3- and 10-year-old pecan [Carya illinoensis (Wangenh.)C. Koch] trees. Vegetative growth was highly sensitive to PBZ for at least 3 to 4 years after a single treatment. There were no differences due to formulation for any of the parameters evaluated. Shoot growth and production of in-shell nuts were negatively related in a curvilinear manner to PBZ rate. Nut size increased the first two seasons after treatment, and yield efficiency increased curvilinearly with PBZ rate. Excessive vigor of Iammas shoots coincided with the cessation of vegetative growth inhibition by PBZ. There was a differential cultivar response in nut yield for 3-year-oid ‘Cheyenne’ and ‘Desirable’ trees; however, there was no cultivar differences in 10-year-old trees of ‘Shoshoni’, ‘Desirable’, and ‘Cape Fear’. Use of PBZ appears to allow for the manipulation of tree size of young pecan trees. Chemical names used: β-[(4-chlorophenyl)-ethyl] -α-(1, l-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol).
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