Early Treatment of Potted Chrysanthemums With Retarding Substances

Response of chrysanthemum to uniconazole and daminozide applied as dip to cuttings or as foliar spray

“…Although these rates were based on commercial recommendations, previous research determined that seasonal variation, particularly in light intensity, during the production period can lead to heterogeneous height control when the same application rates of growth retardants are used (ReissBubenheim and Lewis 1986, v. Hentig andHass 1981). Therefore application rates should be adjusted to individual greenhouse conditions, plant cultivars, and growing season.…”

“…Time to anthesis was not affected by any treatment in this experiment, although the higher concentrations of uniconazole caused excessively short plants, fewer inflorescences, and lower inflorescence dry weight. Preplant dips of chrysanthemum with daminozide had no effect on anthesis (Reiss-Bubenheim and Lewis 1986), whereas higher concentrations of daminozide applied through the rooting substrate delayed anthesis, particularly in fall and winter (v. Hentig and Hass 1981). The highlight intensity in the experiment reported here may have prevented delayed anthesis, which occurred under low-light intensity production conditions (v. Hentig and Hass 1981).…”