Powdery mildew has been found on carrot crops in three states of Australia. The first finding of the disease was in the Murrumbidgee Irrigation Area of New South Wales in 2007. It has been subsequently been found in Tasmania and South Australia in 2008. This fact sheet provides information on the cause, symptoms, and ongoing research project on powdery mildew disease in Australia. It also includes information on fungicide options, yield loss, control, and emergency use permits.