. Response of dwarf mistletoe-infested ponderosa pine to thinning. Arceuthobium Propagation; Ponderosa pine Diseases and pests; Ponderosa pine Thinning. 1000JL; ( a> a o CO l_ a> a w © 9. Maximum and minimum stocking levels Recommended stocking level Initial thinning oogoo Intermediate cuts Stand growth Maximum stocking level H Minimum stocking level 30 (Inches) 25 i (Centimeters) z Diameter breast height 40 80 120 200 Age (years) Figure 8 —Stocking level curves for healthy ponderosa pine where site index is IV or better (Barrett 1979, Meyer 1961). Opt
. Response of dwarf mistletoe-infested ponderosa pine to thinning. Arceuthobium Propagation; Ponderosa pine Diseases and pests; Ponderosa pine Thinning. 1000JL; ( a> a o CO l_ a> a w © 9. Maximum and minimum stocking levels Recommended stocking level Initial thinning oogoo Intermediate cuts Stand growth Maximum stocking level H Minimum stocking level 30 (Inches) 25 i (Centimeters) z Diameter breast height 40 80 120 200 Age (years) Figure 8 —Stocking level curves for healthy ponderosa pine where site index is IV or better (Barrett 1979, Meyer 1961). Optimum stand growth occurs between the recommended and maximum stocking level curves. In practice pine thickets are frequently noncommercially thinned to 180 trees per acre and an average stem diameter of approximately 2 inches or point A. Commercial tree harvests are made at points B. D, and F, and a final harvest of all trees somewhere along line H. Where dwarf mistletoe occurs, a second noncommercial thin- ning may be needed at point A1 to remove undesirable trees to point C1 before allowing the stand to grow to the maximum stocking level curve. Since success in treating sapling stands infested by dwarf mistletoe depends largely on the ability of crop trees to grow well in height, only stands on land qualifying as commercial, with the potential of growing 10 or more inches a year, should be managed for timber production. Determining capacity for height growth on average or poorer sites is difficult. Frequently, overstory trees have been harvested and the remaining advanced re- generation is suppressed in height, thus depriving the forester of a means for determining site index. Sometimes this dilemma can be avoided by measuring height growth for the last 5 years on advanced reproduction that is relatively free of competition. If growth of more open trees approaches 8 to 10 inches annually there is a good chance that, after thinning, crop trees selected from a dense stand al
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