COMPARISON OF GROWTH REGULATOR PERSISTENCE IN VEGETATIVE CHRYSANTHEMUM

in HortScience

The persistence of five growth regulators applied as spray or soil drenches was studied in vegetative Dendranthema X grandiflorum (Ramat) Kitamura `Bright Golden Anne' (BGA) and `Deep Luv' (DL). Spray treatments applied as 3 ml per plant consisted of 0.038 mg uniconazole (UC), 15 mg daminozide (DM), or 0.075 mg of either paclobutrazol (PB), flurprimidol (FP), or ancymidol (AC). Drenches of 0.025 mg UC, or 0.05 mg of either PB, FP or AC were applied at 60 ml per 500 cm3 pot. Growth (cm per week) in BGA was suppressed 60-73% compared to controls the week after application in all treatments except DM, which suppressed growth only 43%. By week 8, growth was similar to controls in all treatments except FP. With DL, all treatments suppressed growth 34-75% compared to controls the second week following application, except for no response to DM and PB sprays. Only plants treated with FP or UC drenches had not returned to similar growth as the control plants by week 10.

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