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New wheat stripe rust pathotype detected in eastern Australia

A new stripe rust pathotype detected at two separate locations in Victoria during 2017 may have important implications for some wheat varieties grown in eastern Australia. Studies during 2018 will better establish the likely impact of this new pathotype on affected wheat varieties.

For most wheat varieties, stripe rust ratings will not change in light of this new detection. However, the following varieties are likely to be more susceptible should this new pathotype become established: Coolah, LRPB Flanker, Axe, B53, Buchanan, Cobalt, EGA Gregory, Grenade CL Plus, Mitch, Steel, Trojan, Viking and Zen. These varieties should be closely monitored during 2018. This new pathotype is the first recorded virulence on Yr33 in Australia. It is also suspected to have virulence on at least one adult plant resistance gene.

Photo of a wheat variety with effective stripe rust resistance which has no symptoms and on the right, a susceptible variety is covered in stripe rust. Source: Luise Sigel, Agriculture Victoria

Resistance genes are important in the management of stripe rust. Left – a variety with effective stripe rust resistance has no symptoms, Right – a susceptible variety covered in stripe rust. Source: Luise Sigel, Agriculture Victoria

If stripe rust is found in a crop, samples should be submitted to the Australian Cereal Rust Program by placing infected leaves in an envelope, without using plastic bags, and sending reply paid to: University of Sydney, Australian Rust Survey, Reply Paid 88076, Narellan NSW 2567. Further details on how to submit samples can be found on The Rust Bust website.

The Australian Cereal Rust Program monitors changes in cereal rust pathotypes. The detection and characterisation of this new pathotype highlights the value of the Cereal Rust Control Program’s monitoring. It is through sample submission that we can understand what the dominant pathotypes are and when there is a new pathotype present – as occurred in this particular case.

See the latest Cereal Rust Report for full details of this new detection. For more information on how The Australian Cereal Rust Program and other research projects use your samples to help protect the Australian grains industry read our article How your farm samples help improve varietal resistance.

Read more about how to manage stripe rust in our article Apply fungicides to rusts emerging in Victorian cereal crops.

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