Ethylene + GA3 Sprays for Delaying Flower Bud Initiation in Chrysanthemum (Dendranthema grandiflora Tzvelv.) Stock Plants

in HortTechnology
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  • 1 Assistant Professor, Department of Horticultural Science, University of Minnesota, 305 Alderman Hall, 1970 Folwell Avenue, Saint Paul, MN 55108.
  • | 2 Research Associate, Department of Horticultural Science, University of Minnesota, 305 Alderman Hall, 1970 Folwell Avenue, Saint Paul, MN 55108.
  • | 3 Professor, Department of Horticultural Science, University of Minnesota, 305 Alderman Hall, 1970 Folwell Avenue, Saint Paul, MN 55108.

Our objective was to determine whether repeated applications of 2-chloroethylphosphonic acid (ethephon) + gibberellic acid (GA3) to stock chrysanthemum plants that are day-neutral for flower bud initiation would increase the number of quality cuttings. Across five cultivars, there were no significant differences between controls and plants receiving 250 ppm ethephon in the total number of cuttings per plant. The percentage of cuttings with crown buds was greater for cuttings from controls than for ethephon-treated plants. Applying 500 ppm ethephon significantly reduced the number of cuttings. We conclude that chrysanthemum clones day-neutral for flower bud initiation and development with low long-day leaf number could be selected to form a 4 to 5 week production group.

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