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  • Author or Editor: R.I. Wilkinson x
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Abstract

Plant height and lateral shoot growth of Camellia × Williamsii ‘Waterlily’ and ‘Debbie’ were controlled effectively by foliar sprays or media drenches of paclobutrazol. A single foliar application of 500 mg·liter–1 paclobutrazol reduced height of both cultivars by ≈30%, and plants were considered commercially acceptable. The response did not carry over into subsequent years. Some rates of paclobutrazol increased the total number of open flowers, but there was a varied effect on flower abscission. Paclobutrazol treatment could prove a useful technique for the commercial production of camellias for temporary use as indoor flowering pot plants before subsequent planting in the landscape. Chemical name used: β-[(4-chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol, ICI-PP333).

Open Access

Shoot extension of Rhododendron `Sir Robert Peel' was reduced, but flowering was more precocious after treatment of plants with paclobutrazol. All of the drench rates tested (0.05 to 0.4 g a.i./pot) proved excessive and resulted in prolonged shoot growth reduction but greatly increased the number of flowers. However, flowers produced at the higher drench rates were grossly malformed and unacceptable. Foliar spray treatments (250 to 2000 mg a.i./liter) were less inhibitory than drenches, and a single spray of 500 mg·liter-1 was considered an appropriate commercial application rate. Paclobutrazol application could thus prove to be a useful technique in producing compact flowering plants of Rhododendron hybrids for improved retail sales. Chemical name used: β-[(4∼chlorophenyl) methyl] (1,1-dimethylethl)-1H-l,2,4-triazole-l-ethano1 (paclobutrazol, ICI-PP333).

Free access

Abstract

Plant height of potted Bouvardia humboldtii Hort. was controlled effectively by foliar or drench applications of paclobutrazol. Three foliar applications of 250 mg·liter−1 paclobutrazol or a drench of 2 mg/100-mm-diameter pot reduced plant height by≈30% and increased the total number of flowers per plant by ≈35%. Overall, paclobutrazol significantly reduced total plant dry weight, and sprays were more inhibitory than drenches. Paclobutrazol altered the shoot : root ratio in favor of the shoot. Foliar sprays of daminozide (5000 mg·liter−1) or chlormequat (2000 mg·liter−1) were ineffective in controlling growth or flowering. It is concluded that paclobutrazol application may be a useful technique in the commercial production of Bouvardia as a flowering pot plant. Chemical name used: β-[(4-chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-l-ethanol [paclobutrazol (ICI-PP333)].

Open Access
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Miniature flowering potted Hydrangea macrophylla Thunb. cv. Merritt's Supreme plants (multistem, 15 to 20 cm tall) were grown in a modified hydroponic system. High-quality plants were produced by pulsing plants with paclobutrazol (0.2 mg·liter-1) for 4 weeks. Flower initiation was advanced in the terminal buds of treated plants by 12 days, and this earlier flower development was maintained through to flower maturity, without loss of inflorescence diameter. Chemical name used: β -[(4-chlorophenyl) methyl] -α-(1,1-dimethylethyl)-1 H -1,2,4-triazole-1-ethanol (paclobutrazol, ICI-PP333).

Free access