Topworking Coastal Douglas-fir

Topworking, the grafting of young scion material into tops of older, reproductively mature trees, was attempted with coastal Douglas-fir. Compared with grafting onto juvenile rootstock, grafts in the older trees had a larger percentage of scions with female flowers (27 percent vs. 5 percent, p<0.01) and more female flowers per scion (0.82 vs. 0.13, p=0.16); however, the increases were very small from a practical point of view.

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Author(s): R. C. Johnson, Donald L. Copes

Publication: Tree Planters' Notes - Volume 52, Number 1 (2007)

Section: 3

Volume: 52

Number: 1