Equipment Trials for Uprooting Root-Rot-Infected Stumps

Abstract

Abstract Root residues were measured following stump-root extraction 1 year after harvesting a 55-year-old Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) stand with 20% infestation of Phellinus weirii (Murr. Gilbertson) root rot. A D8 Cat, a 180-hp (large) backhoe, and a 115-hp (small) backhoe were each used to uproot stumps on 1.2-1.3 ha blocks. All treatments resulted in less than 10% of root volume remaining in the soil compared with pretreatment volumes calculated from dbh-root volume relationships on a similar site. Average numbers and lengths of root residues/m³ soil were significantly greater for the small backhoe than for the other treatments, and volume was greatest for the D8 Cat treatment. The large backhoe treatment resulted in smaller residual volumes than the other treatments. West. J. Appl. For. 3(3):80-82, July 1988.