ISHS Acta Horticulturae 653: IX International Symposium on Plant Bioregulators in Fruit Production
INFLUENCE OF NEW BLOSSOM THINNERS ON FRUIT SET AND FRUIT QUALITY OF APPLES |
| Authors: | E. Fallahi, I.-J. Chun, B. Fallahi-Mousavi |
| Keywords: | 1-naphthyl-N-methylcarbamate, naphthalene acetic acid, ammonium thiosulfate, hydrogen cyanamide, endothalic acid, perlargonic acid, sulfcarbamide, Malus domestica Borkh., postbloom |
| Abstract:
Effects of various rates and/or timings of Dormex, ammonium thiosulfate (ATS), Endothal, and Wilthin on blossom thinning (fruit set), fruit quality, and yield of 'Delicious', 'Rome', 'Fuji' and 'Jonathan' apples (Malus domestica Bork.) were studied. All of these chemicals reduced the fruit set, and the higher concentrations were more effective. Double application of these chemicals often resulted in more blossom thinning than a single application. Double application 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 application of ATS at a rate of 25 mL L-1 resulted in excess thinning and is not recommended for apples. A single application of Dormex at a rate of 3.12 mL L-1 significantly reduced the fruit set of 'Rome'. Double application of Endothal caused fruit marking. | |
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