Changes in Pathogenicity ofDrechslera teresRelating to Changes in Barley Cultivars Grown in Western Australia

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Abstract
Fifty-two isolates of D. teres collected since 1976 were tested in the glasshouse on differential barley (H. vulgare) cultivars at 20/15.degree. C (day/night) under natural daylight conditions. A new group of isolates was identified that were incapable of attacking ''Beecher'', a previously widely grown cultivar susceptible to D. teres. Such isolates emerged to become the dominant population of the pathogen in less than a decade, presumably in response to changes in the host cultivars grown in Western Australia. ''Beecher'' was replaced mainly by ''Dampier'', but now ''Clipper'', which is resistant to D. teres, is the major cultivar being grown in Western Australia.

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