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Research Note
Title: Sampling tree tops by helicopter...special pole pruner cuts branchlets
Author: Wear, John F.; Winterfeld, Robert G.
Date: 1966
Source: Res. Note PSW-RN-131. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6 p
Station ID: RN-PSW-131
Description: A new technique for sampling tops of tall Douglas-fir trees by using a special pole pruner from a helicopter has been developed and field-tested. Thee pole pruner cuts and holds a branchlet. Foliage samples collected will be compared by spectral analysis to show the type of aerial imagery that best differentiates healthy trees from those attacked by root rot.
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Citation
Wear, John F.; Winterfeld, Robert G. 1966. Sampling tree tops by helicopter...special pole pruner cuts branchlets. Res. Note PSW-RN-131. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6 p.