. Economic guides for ponderosa pine dwarfmistletoe control in young stands of the Pacific Northwest. Ponderosa pine Diseases and pests Control Northwest, Pacific; Arceuthobium Control Northwest, Pacific. 40 20 2 â - 0 1.390 2,000 3.000 NUMBER OF INFECTED STEMS PER ACRE Figure 6.--Prun i ng-fe 11 i ng control without precom- mercial thinning; felling operation, time and cost per acre. COST OF FELLING-ONLY CONTROL WITH PRECOMMERCIAL THINNING No time studies have been made in the Northwest of this approach to dwarf mistletoe eradication. However, pruning-felling data for thinning in infected sta
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. Economic guides for ponderosa pine dwarfmistletoe control in young stands of the Pacific Northwest. Ponderosa pine Diseases and pests Control Northwest, Pacific; Arceuthobium Control Northwest, Pacific. 40 20 2 â - 0 1.390 2, 000 3.000 NUMBER OF INFECTED STEMS PER ACRE Figure 6.--Prun i ng-fe 11 i ng control without precom- mercial thinning; felling operation, time and cost per acre. COST OF FELLING-ONLY CONTROL WITH PRECOMMERCIAL THINNING No time studies have been made in the Northwest of this approach to dwarf mistletoe eradication. However, pruning-felling data for thinning in infected stands seem applicable when adjusted upward for the larger number of stems removed in the felling-only method in instances where additional trees must be felled. Figure 7 presents estimated per-acre costs for the felling- only technique, when powered brush- cutters and bow saws are used.. lO k_ 1 t I _J 0 2.000 4, 003 6.030 8.000 TOTAL STEMS PER ACRE Figure 7.--Fe II i ng-on I y control with precom- mercial thinning; cost per acre.. 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 work.. Flora, Donald F. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture