Propagation of Ornamental Plants
7(3): 160-166, 2007
INCREASE OF ROOTING SUCCESS AND FURTHER SHOOT GROWTH BY LONG CUTTINGS OF WOODY PLANTS
Wolfgang Spethmann
Leibniz University of Hannover, Division of Tree Nursery Science, Institute of Floriculture and Woody Plant Science, 2 Herrenhaeuser Str., 30419 Hannover, Germany, Fax: + 49 511 762 3608, E-mail: spethmann@baum.uni-hannover.de
Abstract
Mostly improvement of cutting propagation methods is focused on better rooting, but survival and further growth often has not been included in the investigations. A neglected factor influencing the cutting success is the cutting length. Conventionally cutting lengths of 5-30 cm were used. For 10 years we investigate the influence of long cuttings (50-150 cm, in roses up to more than 250 cm) on rooting, survival and further growth. The paper gives a summary of results with rootstocks of roses and fruit trees, and with tree species and cultivars and also with fruit trees on their own roots. All cuttings were rooted in a high pressure fog system, IBA 0.5%, peat/sand (3:1), pH 4.5, set in late June and July. Using rooted long cuttings instead of seedling stems propagation time of standard roses could be reduced. Long cuttings of street tree species, often difficult to root like Quercus, could be rooted successfully and the further growth has been observed for 7 years. They show a very fast growth. Rootstocks of apple (e.g. M9), cherry or pear are said to be difficult as cuttings, but they root very well with best root system quality and high survival percentage. Some fruit cultivars could be rooted, but some are difficult to root. Surprisingly Pyrus ‘Williams Bon Chretien’ cuttings start flowering as 7 month old cuttings and continued to flower in the following years. Connected with flowering the plants show a retarded growth similar to grafts of the same cultivar on quince.
Key words: further growth, long cuttings, survival
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