The Lodgepole Pine Genetic Improvement Program of the Ministry of Forests relies heavily on a large grafting program to establish clonal materials for future, controlled breeding experiments. Approximately 5,000 rootstock is required annually to accommodate these grafting needs. Our trials indicated the best type of pine rootstock was one derived from a container grown plug +1 seedling when the side-veneer grafting method is used.
One year-old styro-4 plugs and 2+0 nursery-grown stock were transplanted to 2.5 litre pots in the Spring, 8-12 months prior to grafting. Plants were assessed for total height, height to first branch node, and diameter at grafting height after one complete growing season in the pots. The results were statistically analysed using a T-test for 2 means.
Rootstock types contrasted sharply in growth and form. After the first growing season plug seedlings averaged around 20 cm in height and had not developed lateral branches. Consequently, as plugs +1 these seedlings exhibited long, clean stems, free of encumbering branches. Bare-root stock, however, produced 1 and occasionally 2 whorls of branches each of the first 2 years of growth. As 2+1 seedlings, they were short and stocky with a considerably shorter length of stem available for grafting relative to the plug +1. Height to the first major branch node was 31.8 and 14.3 centimetres for plug +1 and 2+1 seedlings, respectively. Diameters differed by less than a millimetre between rootstock types; the differences were not of practical significance.
Plug +1 seedlings are easily grown and require minimal expenditures for mechanization and labour in the nursery. They are readily prepared for grafting by simply stripping the stem of needles and because of their lack of branches, require reduced maintenance after graft establishment.
Further information may be obtained by writing to N.C. Wheeler, or S. Andersen, Ministry of Forests, Red Rock Research Center, R.R. #7, 15 Mile Road, Prince George, B.C. V2N 2J5.
[Abstract contains full text of memo.]
BC Forest Service - Research Division. 1977. Container grown lodgepole pine make excellent rootstock. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Research Memo (FLNRORD). RM22
Topic: FLNRORD Research Program
Keywords: FLNRORD, Research Memo, British Columbia
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