The severity of disease in wheat crops depends on the presence of inoculum carried over from last season, favourability of seasonal conditions, pathotype virulence and varietal susceptibility. In planning which variety to grow or how to manage the variety that has been chosen, it is important to review the current disease resistance ratings. Being aware of disease risks to a crop allows for appropriate planning and proactive management to reduce risk of yield losses.
An annual review of your crops disease resistance ratings is vital as disease risk profiles change with the introduction of new pathotypes. An example of this is the latest incursion of leaf rust, in the attached disease ratings, both the older Lr76 and newer Lr104 pthotypes are listed. It's important for growers to notice that their chosen varieties leaf rust resistance may now have changed and be prepared to mange this accordingly.
The attached documents provide the updated ratings as at October 2018.
We acknowledge the co-investment of the Grains Research and Development Corporation and Department of Primary Industries and Regional Development.