More barley leaf rust reported
- West Kendenup
- Nayerlup (near Borden)
Helen Wyatt has found leaf rust in booting Fathom barley that had been sown in a barley/clover twin sown pasture in Wickepin. The infection was widespread across the crop.
DAFWA plant pathologist Kithsiri Jaysena has reported leaf rust in a tillering Baudin barley crop in West Kendenup. The seed had not been treated.
Kith also reports leaf rust in a tillering Flinders barley crop in Nayerlup. The seed had been treated with Raxil seed dressing.
Barley leaf rust appears as small, circular to oval pustules with light brown powdery spores on upper surface of leaves and on leaf sheaths in cases of heavy infection. Severe infections can result in shriveled grains and yield loss.
Leaf rust can occur throughout the season and develops rapidly in moist conditions when temperatures are between 15-22°C.
Around mid-March leaf rust was detected in regrowth barley (mainly Bass and Oxford) so early sown crops emerging into slightly warmer autumn conditions were at risk from early disease incursion arising from inoculum hosted on green volunteers. Nine spore traps were set up in late April across the lower Great Southern and all nine spore traps are constantly capturing leaf rust spores. DAFWA plant pathologist Kith Jayasena says this tends to suggest that this season is going to be a high disease pressure year. Therefore susceptible barley varieties should be monitored closely and growers need to take immediate control measures.
For information on fungicide treatments visit the department’s Registered foliar fungicides for cereals in Western Australia.
It is important that samples of all rusts are sent for pathotype testing. Infected leaf samples should be mailed in paper envelopes (do not use plastic wrapping or plastic lined packages) along with your details and collection information (location, variety etcetera) directly to the Australian Cereal Rust Survey, Plant Breeding Institute, Private Bag 4011, Narellan NSW 2567. Free reply paid envelopes can be ordered from the University of Sydney.
For further details see the University of Sydney's Cereal Rust website and How to prepare and send samples for dispatch to the Australian Cereal Rust Survey.
For more information contact Kithsiri Jayasena, Plant Pathologist, Albany on +61 (0)8 9892 8477.