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NOVOTNA, K., STOCHLOVA, P.: Selection of the best method for vegetative propagation of mature Alnus glutinosa (L.) Gaertn. trees resistant to Phytophthora alni. Acta univ. agric. et silvic. Mendel. Brun., 2012, LX, No. 1, pp. 105–110 Although alder is readily propagated by seeds our objective was to examine the feasibility of propagating mature Alnus glutinosa (L.) trees by vegetative means that could be used to propagate trees resistant to Phytophthora alni. Both so wood and hardwood cuttings were taken. In the case of hardwood cuttings, two diff erent treatments, based on diff erences in temperature, two growth stimulators (NAA, IBA) and rooting conditions, were tested. Rooting success rate was low, with 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 so wood cuttings, two treatments were used which diff ered in their use of growth stimulators (NAA, IBA) and the dates when material was collected. In contrast to the hardwood cuttings, the so wood 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. So wood 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. black alder, hardwood cuttings, so wood cuttings, vegetative propagation Black alder, Alnus glutinosa (L.) Gaertn., also called European alder or European black alder, is one of about 30 species of alder found mainly in moist, sunny habitats in the Northern Hemisphere. Its native range is in Europe, Asia, and North Africa (Steiner, 1983). Alders are easily propagated by seeds if large numbers of young plants are required, and this method of propagation has been strongly recommended by some (Faria et al., 2008). However, because of the inherent variation resulting from sexual reproduction, using seeds as a means of propagation is not appropriate when many identical individuals are urgently required. In seeking to rapidly propagate plants possessing a rare but highly desirable character, in this case disease resistance, it is more appropriate to use vegetative means. Alders can be vegetatively propagated through layering (Wilson and Jewett, 1986), air layering (Sattoo, 1963), gra ing (Robinson et al., 1979), budding (Buraczyk and Kaźmierczak, 2003) and the rooting of either so wood or hardwood cuttings (Obdržalek and Pinc, 1997; Ayan et al., 2006; Kralik and Sebanek, 1983). The lowest success rates were reported for budding and gra ing (Robinson et al., 1979; Buraczyk and Kaźmierczak, 2003) while up to 100% success has been observed using air layering (Sattoo, 1963). The rooting success of so wood and hardwood cuttings has been reported as ranging from 0 to 68% (Schrader and Graves, 2000; Ayan et al., 2006; Faria et al., 2008) and from 0 to 85% (Holloway and Zasada, 1979; Kralik and Sebanek, 1983; Java and Everett, 1992; Faria et al., 2008). These widely diff ering success rates may be the result of diff erences in the particular alder species used, the 106 K. Novotna, P. Stochlova methods employed and the dates on which material was collected. In our situation, the use of so wood and hardwood cuttings seemed to be the most suitable method to employ for propagating mature alder trees. The treatments employed, such as growth regulator concentration and method of application, were chosen on the basis of published results of cuttings taken from young trees, since there is little specifi c information about the vegetative propagation of adult alder trees. The highest success rates for hardwood cuttings have been reported by Kralik and Sebanek (1983) and Java and Everett (1992), and therefore their methods for propagating hardwood cuttings were employed, and the standard approach to propagating ornamental alder using so wood cuttings (Obdržalek and Pinc, 1997; Obdržalek, personal communication) was also used. The goal of this study was to identify the best method for propagating mature trees of A. glutinosa, in order to produce trees resistant to the black alder pathogen, Phytophthora alni. MATERIAL AND METHODS