Abstract
Experiments were conducted in the Spring of 1991 and 1992 to evaluate the efficacy of paclobutrazol and uniconazole drench and spray applications on the tall-growing Caladium × hortulanum (Birdsey) cultivars Aaron, White Christmas, and Carolyn Whorton. Uniconazole was not more active than paclobutrazol on caladiums as has been observed on other species. Single spray applications of paclobutrazol at 200 ppm were less effective than drench applications and did not provide commercially acceptable plant heights. However, sprays at 100 ppm applied twice a week from one to three weeks after planting and directed at the expanding leaves provided adequate height control. Drench applications were applied at week 1, 2, 3 or 4 at concentrations of 0.0, 0.5. 1.0, 2.0 or 4.0 mg ai per pot. Optimum time of application was 3 weeks after planting and commercially acceptable height control was provided by 0.5 and 1.0 mg of paclobutrazol.
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