Articles
THE EFFECTS OF CHEMICAL TREATMENTS TO SUPPLEMENT CHILLING ON BUD BURST OF PECAN (CARYA ILLINOENSIS KOCH) AT LA COMARCA LAGUNERA, MEXICO
Article number
199_33
Pages
145 – 150
Language
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.
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.
Authors
A. Lagarda
Keywords
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