Isolation of Trichoderma spp. at Low Temperatures from Tennessee and Alaska Soils. L. F. Johnson, Professor, Department of Entomology and Plant Pathology, University of Tennessee, Knoxville 37901. E. C. Bernard, and Peiyuan Qian. Professor, Department of Entomology and Plant Pathology, University of Tennessee, Knoxville 37901, and Instructor in Microbiology, Department of Plant Protection, Shanghai Agricultural College, Shanghai, People’s Republic of China. Plant Dis. 71:137-140. Accepted for publication 15 July 1986. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0137.

Trichoderma spp. were isolated from soils from Tennessee and Alaska on a selective medium at 25, 12, or 10 C. Cold-tolerant species (those isolated at 10 or 12 C) were T. pseudokoningii and T. harzianum from Tennessee and T. viride from Alaska. Densities of cold-tolerant propagules were about seven times greater in Alaska soils than in Tennessee soils. Cold-tolerant strains of T. viride are widespread in Alaska; they were isolated from soils from southern, central, and northern Alaska.