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Abstract
Thorough evaluation of insect impact on forest stands is difficult and expensive on the ground. In a study of tree damage following Douglas-fir tussock moth defoliation in Modoc County, California, large-scale (1:1,584)70-mm. color aerial photography was an effective sampling tool and took lesstime and expense than ground methods. Comparison of the photo interpretations with a sample ground cruisegave high correlations (0.78 to 0.095) for tree mortality top kill, and an estimate of mortality made from photoswas within 5 cut of the ground cruise estimate.
Citation
Wert, Steven L.; Wickman, Boyd E. 1970. Impact of douglas-fir tussock moth... color aerial phtography evaluates mortality. Res. Paper PSW-RP-060. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; 10 p
