| Popis: |
A Rhizoctonia similar in morphology to R. oryzae and R. zeae was frequently isolated from agricultural soils in south central Alaska during 1981-1990. On potato-dextrose agar, cultures developed white to pale orange mycelium. Sclerotia formed in the agar rather than on the agar surface, were irregular in shape (similar to those of R. oryzae), and dark orange to brown when mature (similar to those of R. zeae). Hyphal diameter averaged 6.1 μm and the number of nuclei per cell averaged 5.4. Radial growth increased from 1.1 mm per 24 hr at 11 C to a maximum of 12.8 mm per 24 hr at 10 C. Most isolates infected barley seedlings |
