The effectiveness of Daminozide (B-9) and Uniconazole Sumagic) on height control and delay in flowering of pot chrysanthemums

摘要

Intreduction: Delay in flowering of pot chrysanthemums during the summer is always a point of discussion among chrysanthemum growers, consultants and researchers. Some common theories are that it is caused by either heat delay (especially high temperature during the dark period), the use of a certain growth regulator, or a combination of both. Two common plant growth regulators are used in the industry to control plant height of pot chrysanthemums, namely Sumagic (uni-conazole) and B-9 (damino-zide)Pot chrysanthemums are usually treated with plant growth regulators between week 2 and 7 of the short day period. Growers claim that B-9 is causing the delay in flowering due to the frequent applications during the SD period.