E.J. Holcomb, J.W. White, D.J. Beattie
Lilium 'Sans Souci' is usually grown as a cut flower, but would be a good new potted plant for American markets if height could be effectively controlled. We conducted two experiments to determine the effectiveness of ancymidol and XE-1019 in reducing height when applied as a foliar spray, soil drench, bulb dip, chemigation, or combinations of these. In experiment 1 XE-1019 applied as a spray at 1 to 25 ppm was as effective in reducing stem length as a drench at 0.1 to 0.5 mg ai/plant. Ancymidol applied as a foliar spray at 66 and 132 ppm was as effective as a drench at 0.25 and 0.5 mg ai/plant. In experiment 2 plants sprayed with ancymidol at 0.25 mg ai/plant were 6% shorter and at 0.5 mg ai/plant were 12% shorter than untreated plants. Similarly where plants were drenched with ancymidol at 0.25 mg ai/plant, height was reduced by 9%. The height reduction of plants where the bulbs had been dipped in 100 ppm ancymidol was 21% compared to untreated plants. Plants were 22% shorter than controls when ancymidol was applied through the irrigation water (chemigation). The effectiveness of ancymidol and XE-1019 in reducing stem length depended on the method of application. Ancymidol was most effectively applied as a bulb dip or chemigation and XE-1019 was equally as effective applied as a spray or drench. Combining the bulb dip with either a spray or drench was more effective than either treatment individually.
Holcomb, E.J., White, J.W. and Beattie, D.J. (1989). ADAPTATION OF 'SANS SOUCI' LILIES TO POTTED PLANT CULTURE. Acta Hortic. 252, 159-172
DOI: 10.17660/ActaHortic.1989.252.20

Acta Horticulturae