ISHS Acta Horticulturae 410: II International Cherry Symposium
USING PLANT GROWTH REGULATORS TO INCREASE FRUIT SET IN SOUR CHERRY TREES |
| Author: | T. Bubán |
| Keywords: | self-fertility, self-incompatibility, 2-NOXA, gibberellic acid, frost damage of flowers |
| Abstract:
A product with the trade name 'Phyl-Set', containing 2-NOXA and gibberellic acid as active ingredients, has been developed jointly by the factory PHYLAXIA (at Budapest) and the Station of Enterprise for Research and Extension in Fruit Growing and Ornamentals at Újfehértó. It is formulated as pills, which are easy to prepare into a spray solution. For best effects trees should be treated first at 50% petal fall and again after 12 to 14 days, at the so-called cot-split stage. As much as 10 pills per 100 litres of water are needed at both treatments. Treatments applied in orchards of the self-sterile cultivar 'Pándy' resulted in higher yields. The 7-year average for treated trees was 7.2 t/ha compared with 4.8 t/ha from the untreated controls in the same orchard. The average size of fruits on treated trees was less: approximately 20–21 mm compared with 23–24 mm on untreated controls. Phyl-Set also proved to be useful on trees of self-fertile cultivars, particularly following frost damage during flowering, when the stigma and the style but not the ovary of the pistil have been killed by frost. Treatments in such frost years provided nearly double the yields of untreated trees of the self-fertile cultivars 'Újfehértói fürtös' and 'Meteor korai'. | |
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