ISHS Acta Horticulturae 199: II International Workshop on Temperate Zone Fruits in the Tropics and Subtropics
THE EFFECTS OF CHEMICAL TREATMENTS TO SUPPLEMENT CHILLING ON BUD BURST OF PECAN (CARYA ILLINOENSIS KOCH) AT LA COMARCA LAGUNERA, MEXICO |
| Author: | A. Lagarda |
| Abstract:
Pecan cultivars differed in adaptation to chilling winters at La Comarca Lagunera, bud burst varying from 37 to 64%. Chilling hours accumulated in this area average 400–590 hours below 7°C. Pecans require about 600 chilling hours; thus low bud burst reflects incomplete chilling. The cultivar 'Western Schley' was treated with several rates of dinitro-ortho-sec-butyl-phenol (DNOSBNP) + dormant oil, thiourea or potassium nitrate (KNO3). The highest doses used (0.2 DNOSBP + 2.5% dormant oil; 3% thiourea and 3% KNO3), did not increase bud break. No phytotoxicity was observed when the products were sprayed before the beginning of bud burst, even with doses of 0.4% DNOSBP in one spray, or when repeating the applications to the same trees up to 3 times, thus resulting in total concentrations of 6% DNOSBP + 9% dormant oil. Fruit ripening was not modified by the treatments. | |
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