Anastomosis groups, pathogenicity, and specificity ofRhizoctonia solaniisolates from seedling and adult rapeseed/canola plants and soils in Saskatchewan

Biology and control of Rhizoctonia solani on rapeseed : A Review

“…Isolâtes of AG2-1 from seedlings and adult rapeseed plants were generally more virulent than those of AG2-2 and AG4, but virulence differed markedly among isolâtes of the same AG (Gugel et al 1987;Kaminski and Verma 1985;Yitbarek 1987;Yitbarek et al 1987). Isolâtes from seedlings and adult plants were more virulent than those of the same AG from soil.…”

“…In thèse surveys, isolâtes from field-infected seedlings belonged to AG2-1 and AG4, with fré-quences of 94 and 6%, respectively. Among isolâtes from adult plants, 69% were AG2-1, 29% were AG4 and 2% were AG2-2 (Yitbarek 1987;Yitbarek et al 1987). Ail R. solani isolâtes from rapeseed in Indiana (U.S.A.) belonged to AG2-1 (Huber et al 1992).…”

“…The population of R. solani that infects oilseed râpe and canola is mainly composed of anastomosis groups (AGs) AG2-1 and AG4 which cause pre-and post-emergence damping-off, seedling root rot and basai stem or foot rot (brown girdling root rot) ofadult plants (Gugel étal. 1987;Kaminski and Verma 1985;Yitbarek et al 1987).…”

Host Range Studies of Rice Sheath Blight Fungus Rhizoctonia solani (Kuhn)

“…The pathogen is capable of causing seedling damping-off, root rot, collar rot, stem canker, crown rot, bud and fruit rots, and foliage blight on a variety of susceptible agriculturally important crops (Baker 1970;Anderson 1982) like soybean (Glycine max L. Merr., Liu and Sinclair, 1991), cotton (Gossypium hirsutum L.; Brown and McCarter, 1976), canola (Brassica campestris L.; Yitbarek et al, 1987), wheat (Triticum aestivum L.; Wiseman et al, 1995), beet (Beta vulgaris L.; Carling et al, 1987), potato (Solanum tuberosum L. subsp. tuberosum; Escande and Echandi 1991) and rosemary (Rosemarinus officinalis L.; Conway et al, 1997).…”

Effects of herbicides on growth and survival, and influence of latitude on anastomosis group diversity in Rhizoctonia solani

“…Yitbarek et aL (1987) found that most of the isolates recovered from seedlings of rape seed were AG-2-1 when the temperatures were cool during early spring, while most of the isolates recovered from mature plants were AG-4 when the temperatures rose later in the growing season. Field experiments by Teo et al (1988) in Saskatchewan showed that soil temperatures up to 15 °C favored the occurrence of AG-2-1 while a soil temperature of 20 °C favored AG-4.…”