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    Author(s): A.T. Larsen
    Date: 1957
    Source: PNW Old Series Research Notes No. 149, p. 1-4
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (270 KB)


    Aerial surveys are widely used to detect, appraise, and map damage caused to forest trees by insects. The success of these surveys largely depends upon the ability of observers to distinguish differences in foliage color and tree condition. The observers' ability is influenced by several factors.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Larsen, A.T. 1957. Visual aids for aerial observers on forest insect surveys. PNW Old Series Research Notes No. 149, p. 1-4

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