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KMID : 0903619950360010090
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Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 1 p.90 ~ p.97
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Effect of Daminozide , Uniconazole , Flurprimidol , and Maleic Hydrazide on Growth of Pot Chrysanthemum
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Abstract
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An experiment was carried out to compare the effect of daminozide, uniconazole, flurprimidol, and malefic hydrazide on growth and stem elongation in pot chrysanthmum. Cuttings of Dendranthema grandiflorum were planted for rooting in nursery bed on June 15 and July 14. Rooted cuttings were transplanted to pots and grown in a vinyl house.
The pot chrysanthemums were foliar-treated with four growth regulators at the beginning stage of flower stalk elongation. Each agent was applied twice with a week interval. The concentrations of daminozide, uniconazole, and flurprimidol to reduce stem length by 30 percent were 4800, 25.6, and 40 ppm, respectively, in the June 15 planting, and the late cuttings needed 233, 11.9, and 7.1 ppm, respectively, in the July 14 planting.
Malefic hydrazide treated chrysanthemums produced malformed flower buds in the earlier cuttings and no flower buds in the second cuttings. Flurprimidol treatment caused some leaf injuries, prominently reddish leaves and irregular internodal length, and delayed flowering longer than a week. Daminozide and uniconazole reduced stem elongation without significant side effects. Foliar application of uniconazole at 20 ppm twice with a week interval at the beginning stage of flower stalk elongation may substitute the use of daminozide as dwarfing agent for the pot chrysanthemums.
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