ISHS Acta Horticulturae 774: XXVII International Horticultural Congress - IHC2006: International Symposium on Endogenous and Exogenous Plant Bioregulators
USE OF NEW BLOSSOM THINNERS TO REDUCE FRUIT SET AND IMPROVE FRUIT QUALITY IN APPLES, PEACHES, NECTARINES, AND PLUMS |
| Authors: | E. Fallahi, B. Fallahi, Ik-Jo Chun |
| Keywords: | apple, peach, nectarine, plum, blossom thinners, fruit set, russeting |
| Abstract:
Effects of ammonium thiosulfate (ATS) on fruit set, fruit quality, and yield of ‘Fuji’ apple (Malus domestica Bork.) were studied in 2000. Double applications of ATS at a rate of 15 ml·L-1 or a single application of this chemical at a rate of 25 ml· L-1 resulted in satisfactory levels of thinning in ‘Fuji’ apple. Double applications of ATS at a rate of 25 ml·L-1 resulted in excessive thinning. Also, effects of Tergitol-TMN-6 on fruit set, quality, and yield in ‘August Lady’ and ‘Zee Lady’ peaches [(Prunus persica (L.) Batsch] in 2004 and 2006, in ‘July Red’ nectarine in 2005, and in ‘Empress’ plum [(Prunus domestica (L.)] in 2004 were studied. In addition to Tergitol-TMN-6, the effect of Crocker’s Fish Oil (CFO) in combination with lime sulfur on fruit set, quality, and yield in ‘July Red’ nectarine in 2005 was studied. Tergitol-TMN-6 at 5 ml·L-1 or higher rates and applied at about 75-80% bloom reduced fruit set without russeting peach fruit. Peach fruit size was often increased by Tergitol-TMN-6 treatment. Tergitol-TMN-6 at 7.5 or 10 ml·L-1 and applied either once at 75-80% bloom or twice at 35% bloom and again at 75-80% bloom, reduced fruit set without any fruit russeting in nectarine. Tergitol-TMN-6 at 7.5 to 12.5 ml· L-1 reduced fruit set and increased fruit size in ‘Empress’ plum. | |
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