Occurrence and Pathogenicity of Drechslera teres Isolates Causing Spot-type Symptoms on Barley in Western Australia. T. N. Khan, Plant Pathologist, Department of Agriculture, South Perth, 6151, Western Australia. A. Tekauz, Plant Pathologist, Agriculture Canada, Research Station, 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9, Canada. Plant Dis. 66:423-425. Accepted for publication 13 July 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982. DOI: 10.1094/PD-66-423.

Drechslera teres, the cause of spot-type symptoms on barley (Hordeum vulgare), is reported from Australia for the first time. Spot-type isolates were similar to net-type isolates of D. teres in conidial morphology and colony characteristics. Western Australian spot-type isolates differed from Canadian spot-type isolates in pathogenicity on two barley cultivars. A high degree of resistance to spot-type isolates was rare, and only CI 6225 and CI 9214 were resistant to both spot-type and net-type isolates. The common occurrence of spot-type isolates in the northern wheat belt of Western Australia may be the result of widespread use of the susceptible cultivar Clipper, which is field resistant to net-type isolates of D. teres.

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