Characteristics of wheat eyespot pathogen in Japan
2020
Takeuchi, T. (Hokkaido Research Organization Agricultural Research Department, Hokkaido (Japan))
Isolates of the eyespot pathogen collected from the wheat fields in Hokkaido, Japan, were divided into two groups based on colony morphology on PDA: fast-growing, even-edged (FE) and slow-growing, feathery or uneven-edged (SF). We investigated conidial morphology and the pathogenicity to rye of these isolates. The morphological characteristics of conidia of FE and SF groups were almost identical to Pseudocercosporella herpotrichoides var. herpotrichoides and P. herpotrichoides var. acuformis described by Nirenberg (1981), restively. Pathogenicity to wheat and rye seedlings was determined for FE and SF isolates. FE and SF isolates were about equally pathogenic to wheat; SF isolates were more pathogenic to rye than FE isolates. Thus, in morphology and pathogenicity FE isolates conformed to the published descriptions of W-types, while SF isolates conformed to the descriptions of R-types. However, these two groups of the pathogens could not be clearly distinguished by conidial morphology and the pathogenicity to rye.
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