Skip to Main Content
Effects of leader topping and branch pruning on efficiency of Douglas-fir cone harvesting with a tree shaker.Author(s): D.L. Copes
Source: Res. Note PNW-RN-431. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
Download Publication (460 KB)
DescriptionIn 1983, a study was conducted to evaluate the effects of leader topping and branch pruning on the efficiency to tree shaking to remove Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) cones. Removal efficiency for three topping and pruning treatments averaged 69 percent, whereas for the uncut control treatment it was 62 percent. The treatment combination that resulted in the greatest cone removal (70.8 percent) was cutting the last 2 years of growth from the leader but not pruning lateral branches. The pruning-topping effects were not additive, possibly because branch pruning several weeks prior to cone harvest resulted in premature removal of a portion of the most easily shaken cones.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationCopes, D.L. 1985. Effects of leader topping and branch pruning on efficiency of Douglas-fir cone harvesting with a tree shaker. Res. Note PNW-RN-431. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p
KeywordsCone collection, pruning, top pruning, pruning tools, Douglas-fir, tree shaker
- Tree shaking machine aids cone collection in a Douglas-fir seed orchard.
- Calibration and modification for the Pacific Northwest of the New Zealand Douglas-fir silvicultural growth model.
- Pruning high-value Douglas-fir can reduce dwarf mistletoe severity and increase longevity in Central Oregon
XML: View XML