Association of Black Stain Root Disease with Roads, Skid Trails, and Precommercial Thinning in Southwest Oregon

摘要

The incidence and severity of black stain root disease (BSRD) were evaluated in a two-stage sample of 500 precommercial-aged Douglas-fir plantations on 5 Resource Areas of the Medford District, Bureau of Land Management. Black stain was widely distributed throughout the western half of the district. Nearly 19/100 of the susceptible-aged (10-to 30-yr-old) plantations were infected with black stain, but mortality Losses were low.