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    Author(s): John F. Wear; Robert G. Winterfeld
    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
    Publication Series: Research Note (RN)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (1.33 MB)

    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

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