INFLUENCE OF WILLOW AND POPLAR EXTRACTS ON ROOTING CUTTINGS1,2
Claude Richer Leclerc and Calvin Chong
Crude water extracts were prepared from shoots (1 g freeze-dried powder/25 ml H2O) of weeping willow (Salix alba var. tristis) or of lombardy poplar (Populus nigra ‘Italica’) collected at intervals during the year. Extracts from both species or combinations of extracts + 5,000 or 20,000 mg/liter IBA inhibited rooting of Cotoneaster acutifolius cuttings. In comparison with water-treated (control) cuttings, cuttings of both Philadelphus coronarius ‘Aureus’ and Ribes alpinum (but not Cornus alba lsquo;Argenteomarginata’) showed consistently better rooting after treatment with seasonal willow extracts.
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