ISHS Acta Horticulturae 329: VII International Symposium on Plant Growth Regulators in Fruit Production
CONTROL OF PEACH FLOWERING WITH GIBBERELLINS |
| Authors: | A. Gur, E. Harcabi, A. Breuer-Mizrahi |
| Abstract:
Control of peach flowering by summer sprays with gibberellins was studied with three cultivars. GA3 was more effective than GA4+7 at equal concentration in reducing the percent of flower buds out of the total bud number, however GA4+7 increased fruit size compared to GA3. GA3 application 6 weeks after full bloom was more effective than later summer dates. The optimal concentration was between 100 to 200 mg/l according to cultivar, when the surfactant Triton X100 was used. Adding citrate-phosphate buffer at pH 4 or using the surfactant Silwet L-77 reduced the optimal GA3 concentration by half. The reduction in the amount of labor required for hand thinning after application of GA was 41 to 52% compared to untreated controls. GA retarded the development of flower buds, resulting in low rates of outgrowth in spring. A reduced flower bud formation due to application of GA was accompanied by low arginine levels in the shoot bark in November and December. | |
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