The effects of sanitation-salvage cutting on insect-caused mortality at Blacks Mountain Experimental Forest, 1938-1959 effectsofsanitat66wick Year: 1962 Insects accounted for most of the dead timber--much more than all other causes combined—in both cut and uncut areas. Of the reserve stand losses following sanitation-salvage, 75 percent were due to insects; in stands where no cutting was done, 91 percent of the losses were insect- caused. Wind was the next most destructive agent. It did considerably less damage than insects, although causing a much higher proportion of the total mortality on
The effects of sanitation-salvage cutting on insect-caused mortality at Blacks Mountain Experimental Forest, 1938-1959 effectsofsanitat66wick Year: 1962 Insects accounted for most of the dead timber--much more than all other causes combined—in both cut and uncut areas. Of the reserve stand losses following sanitation-salvage, 75 percent were due to insects; in stands where no cutting was done, 91 percent of the losses were insect- caused. Wind was the next most destructive agent. It did considerably less damage than insects, although causing a much higher proportion of the total mortality on the cut compartments than on the uncut. Average annual insect-caused mortality for individual compartments varied considerably, particularly among those with short records (table 11, appendix). For the sanitation-salvage compartments, it ranged from 0 to board feet per acre, and the mean was 19•5 board feet. For compart- ments where no cutting was done, this mortality ranged from to 2^9*2 board feet per acre and the mean was 99-5 board feet. Over the 22 years, insects did more than four times as much damage in the stands containing high-risk trees as in those that did not (fig. 8). One source of variation in the records is the year of cutting, because insect-caused mortality in the treated compartments did not equal Figure pon- derosa pine trees killed by western pine beetle at Blacks Mountain. This type of loss was not un- common on the uncut compartments.
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