First report of the powdery mildew Erysiphe diffusa on soybean in Australia

A powdery mildew with a Pseudoidium anamorph was found on Glycine max in south-east Queensland, Australia. Morphological examination and molecular identification determined this species as Erysiphe diffusa, which is reported for the first time from Australia. © 2012 Australasian Plant Pathology Society Inc.