Selection of the best method for vegetative propagation of mature Alnus glutinosa (L.) Gaertn. trees resistant to Phytophthora alni
Novotna, K., Vyzkumny Ustav Silva Taroucy pro Krajinu a Okrasne Zahradnictvi, Pruhonice (Czech Republic) | Stochlova, P., Vyzkumny Ustav Silva Taroucy pro Krajinu a Okrasne Zahradnictvi, Pruhonice (Czech Republic)
Our objective was to examine the feasibility of propagating mature Alnus glutinosa trees by vegetative means that could be used to propagate trees resistant to Phytophthora alni. Both softwood and hardwood cuttings were taken. In the case of hardwood cuttings, two different treatments, based on differences in temperature, two growth stimulators (NAA, IBA) and rooting conditions were tested. Rooting success rate was low: only 1.3 to 5 % of treated cuttings rooting in comparison with 0 to 1.3 % of the untreated control cuttings. In the case of softwood cuttings, two treatments were used. They differed in their use of growth stimulators (NAA, IBA) and the dates when material was collected. In contrast to the hardwood cuttings, the softwood cuttings rooted better in both treatments. The cuttings collected at the later date rooted better; 30 to 42.5 % of the treated cuttings rooted when compared to 15 % in the control treatment. Softwood cuttings collected in the middle of July and then treated with 1% IBA rooted the best of all, with 42.5 % of cuttings rooting successfully.
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