Stem Breakage Effect on Cone and Pollen Production in Pinus Monticola (Dougl.)

摘要

Two studies in a western white pine blister rust resistance breeding arboretum/seed orchard examined the effect of stem breakage on cone and pollen production. Research was based on 4 years of data from 1,529 trees 15 to 29 years of age. Cone and pollen production were increased by breakage of the main stem in the upper crown. Top pruning may be a viable technique for stimulating flowering inseed orchards of western white pine.