. A case study of a Douglas-fir tussock moth outbreak and stand conditions 10 years later. Douglas-fir tussock moth; Tree declines California; Trees Diseases and pests California. Figure 1.—Location and area of white fir type killed by defoliation from the Douglas-fir tussock moth at Stowe Reservoir. The map was produced from the 1:8,000-scale color photography. The original stand was heavily logged about the turn of the century and the stumps show that a pine stand of large trees (36- to 40-in ) covered all but the upper elevations. It was logged a second time for fir overstory in all b
. A case study of a Douglas-fir tussock moth outbreak and stand conditions 10 years later. Douglas-fir tussock moth; Tree declines California; Trees Diseases and pests California. Figure 1.—Location and area of white fir type killed by defoliation from the Douglas-fir tussock moth at Stowe Reservoir. The map was produced from the 1:8,000-scale color photography. The original stand was heavily logged about the turn of the century and the stumps show that a pine stand of large trees (36- to 40-in ) covered all but the upper elevations. It was logged a second time for fir overstory in all but the campground area in 1954. No fires have burned in the stand for at least 50 years and probably none since the turn of the century. White fir is now the predominant tree species, growing as scattered patches of saplings, poles, and young sawtimber through- out the basin. Methods Numerous examinations have been made of the outbreak since 1967 to obtain various bits of information, for example damage to the campground (Wickman and Renton 1975), but only the major study efforts will be recorded here. In 1967, as part of an aerial photography study, a crew systematically sampled the area by examining conditions on 1 /50th-acre () circular plots, established at 2- chain intervals along cruise lines 5 chains apart (Wert and Wickman 1970). Small-scale (1:8,000 ft) aerial photographs were used to determine cruise lines. Large — scale (1:1,500 ft) aerial photo coverage and data from the plots provided an estimate of pre- outbreak stand conditions and total white fir damage in the area. A sample of the area or acres ( ha) of plots were established to obtain a coefficient of variation 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wickman, Boyd E. cn; Pacific Northwest Forest and
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
