Barley leaf rust in the south
Andrea Hills (DAFWA) reports Baudin barley at Z33/34 stage with leaf rust on the fourth leaf. As Baudin is rated very susceptible to leaf rust it will be sprayed with prothioconazole 210g/L + tebuconazole 210g/L at flag -1 emergence. Other barley varieties she inspected had rust at lower levels and will be monitored to see if the disease develops with warmer weather as the disease develops rapidly in moist conditions when temperatures are between 15-22°C. Kith Jayasena (DAFWA) has also found leaf rust in the Flinders barley at Tambellup in which he reported finding spot-type and net-type net blotch. He also reports barley leaf rust on Bass barley (Z33) at Pallinup which was initially treated with Hombre seed dressing. Kith comments that growers should spray any infections early because if the disease gets away it is difficult to manage.
More detailed information about barley leaf rust can be found at DAFWA’s:
- More barley leaf rust reported article in PestFax Issue 12.
- Diagnosing barley leaf rust page
- Barley leaf rust YouTube video.
The Sydney University, Australian Cereal Rust Survey has pathotype analysis underway on samples received from early rusts in volunteers and crops, with results available for the earliest sample received, which was off volunteer Bass barley from Pallinup in March. This information can be found at Cereal rust situation, July 2016 with earlier issues found at Cereal rust reports.
For more information contact Kithsiri Jayasena, Plant Pathologist, Albany on +61 (0)8 9892 8477