ISHS Acta Horticulturae 293: IX International Symposium on Apricot Culture
EFFECTS OF POSTHARVEST GIBBERELLIC ACID APPLICATION ON RETURN BLOOM OF 'PATTERSON' APRICOT |
| Authors: | S.M. Southwick, J.T. Yeager |
| Abstract:
Effects of postharvest limb and whole tree gibberellic acid (GA) sprays on flower and fruit production were investigated over a 2 year period in 'Patterson' apricot (Prunus armeniaca). Limb GA spray treatments of 29 June 1987 were more effective than 10 and 31 August treatments in reducing the number of flowers, fruit set and number of fruit produced in the following season. GA concentrations of 10 and 100 mg . liter-1 were most effective without causing adverse effects. A single whole tree GA spray on 7 July or 8 August indicated that 50 and 100 mg . liter-1 concentrations delayed bloom. Fruit size at harvest was increased by a 100 mg . liter-1 GA spray applied on 7 July. GA concentration or spray date had no significant effect on yield per tree, fruit soluble solids or firmness. 'Patterson' apricot is a cultivar capable of producing high yields of large sized fruit and growers may not benefit economically from regular fruit thinning. | |
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