ISHS Acta Horticulturae 69: II International Symposium on Pear Growing
AN EXPERIMENT TO INDUCE EARLY PEAR CROPPING BY THE USE OF GROWTH REGULATORS AND SHOOT TIPPING |
| Author: | H. Jonkers |
| Abstract:
Young trees of the cultivars 'Beurré Hardy' and 'Doyenné du Comice' on Quince A were planted in 1969. From 1972 to 1976 GA4+7 at 16 ppm was sprayed yearly and at about 60% of flowering, CCC at 2000 ppm was applied yearly when 8–10 leaves per shoot were present. As a third factor shoot tipping was used. These 3 factors were applied alone or in all possible combinations with a control. The harvests in 1972 and 1973 were small, in 1974 a good crop was obtained and 1975 was a complete off-year. For the harvest in 1974 the combination of GA4+7 + CCC was most effective. Shoot tipping had no advantage. CCC reduced tree size and annual stem increment and enhanced fruit bud formation mainly in 'Beurré Hardy'. | |
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