Figure 25. Corn growing regions of Australia (from: Allen, R. N., and D. R. Jones. 1983. Plant Disease Survey 1981-82, pp 17-20, New South Wales Department of Agriculture). An occurrence of boil smut in 1911 was eradicated from the Bathhurst area (A). Boil smut reoccurred in northeastern New South Wales and southern Queensland in 1982 (B). Since the early 1980s, Ustilago maydis crossed the Great Dividing Range where it spread to regions west of Sydney including areas near Bathurst, Dubbo, and the Murrimbigee Irrigation district (C). BACK