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Several species of Peronosclerospora (Peronosporaceae, Oomycates) which cause downy mildew on grasses (Poaceae) have been recorded in Australia, with two, Peronosclerospora noblei and P.sargae, being found only on wild grasses indigenous to Australia.The only downy mildew species which has caused significant damage on a cultivated grass crop in Australia was P.sacchari on sugarcane (Saccharum officinarum), but that pathogen is now considered to be eradicated.