. Bark beetle risk in mature ponderosa pine forests in western Montana. Bark beetles Montana; Ponderosa pine Diseases and pests Montana. On the basis of the 553 acres of the 35 plots, Risk 3 and Risk 4 trees together averaged trees and 3,342 board feet per acre. The mean per-acre volume of these high risk trees varied in each of the 35 plot stands, but it was less than 2,000 board feet in only eight of these stands (table 5). Risk 3 and Risk 4 trees together represented percent of the 11,946 mature ponderosa pine trees measured during the study; their total volume constituted per
. Bark beetle risk in mature ponderosa pine forests in western Montana. Bark beetles Montana; Ponderosa pine Diseases and pests Montana. On the basis of the 553 acres of the 35 plots, Risk 3 and Risk 4 trees together averaged trees and 3,342 board feet per acre. The mean per-acre volume of these high risk trees varied in each of the 35 plot stands, but it was less than 2,000 board feet in only eight of these stands (table 5). Risk 3 and Risk 4 trees together represented percent of the 11,946 mature ponderosa pine trees measured during the study; their total volume constituted percent of all measured pine trees. These percentages, too, varied among the 35 plot stands (fig. 5). 40| (0 30 liJ UJ. PLOTS Figure 3.—Variation in the percentage of pooled Risk 3 and Risk 4 trees in overstory stands of mature ponderosa pine on 35 plots in western Montana. The horizontal position of the plots is not necessarily the same in the upper and lower histograms. 17. 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 Johnson, Philip C. (Philip Cornwell), 1907-; Intermountain Forest and Range Experiment Station (Ogden, Utah) 1n. Ogden, Utah : Intermountain Forest & Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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