ISHS Acta Horticulturae 272: Symposium on Bedding and Pot Plant Culture
FACTORS AFFECTING EFFICACY OF PACLOBUTRAZOL AND UNICONAZOLE ON PETUNIA AND CHRYSANTHEMUM |
| Authors: | James E. Barrett, Terril A. Nell |
| Abstract:
In a factorial arrangement, Petunia hybrida (Hort.) L. cv. White Flash was maintained either well-watered or allowed to wilt before irrigation; fertilized with 40, 80, 160, or 320 mg/liter of N in each irrigation; and sprayed with paclobutrazol at 0, 45, or 90 mg/liter. Maximum size occurred in plants that were well-watered and received 0 mg paclobutrazol and highest fertilizer. Each factor affected plant size, but the affects of each was the greatest when the other two were not limiting. Dendranthema grandiflora (Tzvelev.) were grown as single-stem, vegetative plants and given different chemical treatments. Increasing spray volume from 100 to 400 ml/m2 increased the effects of paclobutrazol treatments, but not for daminozide. When media surface was covered to prevent paclobutrazol spray solution from reaching the media, the effects of the spray was reduced compared to treatments without the media covered. Comparing the activity of paclobutrazol and uniconazole indicated that uniconazole was more active than paclobutrazol and that the difference increased with increasing concentration. | |
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