1 Department of Primary Industries and Regional Development, PO Box 432, Merredin, WA, 6415, www.dpird.wa.gov.au, email@example.com
2 Department of Primary Industries and Regional Development, 75 York Rd, Northam, WA, 6415
Soil levels of crown rot DNA gradually increased over four years of continuous wheat in WA’s low rainfall Eastern Wheatbelt. Fallow and canola breaks reduced DNA levels but these rapidly recovered even after a single wheat crop. Levels of disease expression were lower after break crops in some seasons but higher in others, even if inoculum levels were low, due to interaction between growth vigour and rainfall pattern. Nevertheless crop sequence did not affect grain yield over this period so continuous wheat remained sustainable for four years.