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- Author or Editor: R. Kent Kimmins x
α-Cyclopropyl-α-(4-methoxyphenyl)-5-pyrimidinemethanol (ancymidol) applied to inherently tall-growing chrysanthemum cultivars controlled ht at concn of 62 mg/liter (0.06 mg/15 cm pot) when applied as a foliar spray, and 0.12 mg/15 cm pot when applied as a soil drench. An thesis was delayed in plants treated with high concn of the growth retardant but flower size and no., and node no. were unaffected.
Silver thiosulfate (STS) foliar sprays applied 1 and 4 weeks prior to simulated shipping reduced corolla abscission of Streptocarpus × hybridus Voss. Spray concentrations of 0.5, 1.0, and 2.0 mm were all effective in reducing corolla abscission when appropriately timed. Sprays applied 24 hr prior to shipping caused necrotic lesions on the flowers and foliage and proved harmful in the warm, humid environment used in simulated shipping. A combination treatment with STS (2 mm) sprayed 4 weeks and again 24 hr prior to shipping showed the 4-week spray treatment to precondition the plants thereby preventing injurious effects by the 24 hr treatment and decreasing corolla abscission 46.6%. STS folair sprays applied one week prior to shipping at 0.5 him and 1.0 mm prevented corolla abscission with 0% corolla abscission after simulated shipping.
Low light intensity caused an increase in size and a delay in flowering of gloxinias (Sinningia speciosa Benth and Hooke cv. Dwarf Delight and Royal Frosted Red). The growth regulators succinic acid-2,2-dimethyl hydrazine (SADH) and (αcyclopropyl-α-(4 methoxyphenyl)-5-prymidinemethanol (ancymidol) decreased plant size and delayed flowering. ‘Dwarf Delight’ showed damage in response to ancymidol at 250 mg/liter and higher but ‘Royal Frosted Red’ showed no damage. SADH caused a noticeable increase in anthocyanin content of the inflorescence and chlorophyll content of the leaves.