Articles
UNICONAZOLE – A NEW TRIAZOLE GROWTH REGULANT FOR APPLE
Article number
239_34
Pages
249 – 252
Language
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.
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.
Authors
L.D. Tukey
Keywords
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