ISHS Acta Horticulturae 239: VI International Symposium on Growth Regulators in Fruit Production
UNICONAZOLE - A NEW TRIAZOLE GROWTH REGULANT FOR APPLE |
| Author: | L.D. Tukey |
| Abstract:
Uniconazole (S-3307), a triazole growth retardant inhibiting GA biosynthesis, was highly effective on growing apple shoots. Initially, it increased leaf color, suppressed shoot elongation and induced the setting of terminal buds. Lateral growth was as spurs and short shoots. With continued use flowering was often enhanced. Anatomical and morphological changes were noted, such as less lignification in branches. All cultivars tested responded. Three sequential sprays at 3 week intervals starting at, or 2–3 weeks after, petal-fall were very effective in growth control. The sequential rate was 125 ppm which was lowered to 65 ppm when necessary, to maintain growth control. A single combination spray of uniconazole with BA, each at 250 ppm, applied 3–4 weeks after petal fall, enhanced axillary bud development and potential cropping. Uniconazole is probably one of the most useful triazoles for the regulation of growth and bearing in apples and for studies on the mechanism of plant growth. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
