Chemical Removal of Lateral Buds of Chrysanthemum morifolium Ramat1

Abstract

2,3-Dihydro-5-6-diphenyl-l,4-oxanthin (UNI-P293), was used to determine its effectiveness as a disbudding agent of Chrysanthemum morifolium cv. May Shoesmith. Concentrations of 0.5, 0.75 and 1.0% were applied on the 18th, 21st and 24th short day (SD). The optimum concentration on the 18th SD was 0.5% and 1.00% on the 21st SD. There was no difference among concentration levels on the 24th SD. Flower size and date of anthesis were not adversely affected when manual disbudding was used as a supplement to chemical treatment, but smaller flowers and delayed anthesis usually occurred when only the chemical was used for disbudding. All treated plants were shorter than untreated plants.

Chemical Pruning of Chrysanthemums with a Surface Active Agent1

“…Morphactin, a fluorene com pound, has also been shown to possess disbudding properties (11), but is effective only for a specific cultivar. Recently Cathey (2) and Zachariodakis et al (13) reported chemical disbudding with substituted oxanthiin on chrysan themums.…”