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Australian Cereal Rust Report: Volume 12, Issue 2: Cereal rust situation update, July 2014


Sydney, Australia
July 28, 2014

Source

Samples received by the Australian Cereal Rust Survey at the Plant Breeding Institute in the last two weeks indicate that inoculum levels of wheat stripe rust and oat crown rust are increasing in eastern Australia. Barley leaf rust has been reported across the southern section of the Western Australian grain belt and the first sample of barley leaf rust in the eastern states has been received from NSW. Where known, details of current pathotypes and localities are provided below.

First samples of wheat stripe rust

The first samples of wheat stripe rust were received on the 17th July from Boree Creek in NSW. Infection was sampled from crops of both Wedgetail and Suntop. Since then, samples have since been received from Tarcutta off infected Marombi and from Wagga Wagga.

Wheat leaf rust reported in South Australia and northern NSW

Samples of wheat leaf rust received in May were determined to be pathotype 76-3,5,7,9,10,12,13 +Lr37 from Quirindi in northern NSW and 76-3,5,7,9,10,12 +Lr37 from Wharminda in South Australia. On the 19th June, a sample was received from a Naparoo crop near Scone in NSW.

Barley leaf rust reported from western and eastern Australia

The sample of barley leaf rust received from South Stirling in Western Australia in April was determined to be pathotype 5457P- and the sample from Woogenellup in May was determined to be a mixed infection of pathotypes 5457P- and 5453P+. Samples have since been received on the 22nd July from Kojaneerup South in Western Australia. The samples were from crops of Baudin, La Trobe and Bass.
The first sample of barley leaf rust from eastern Australia was received on the 15th July off Hindmarsh regrowth near Old Junee in NSW.

Stem rust on barley reported

The sample of stem rust received from a crop of Shepherd barley on the 30th April 2014 was determined to be an isolate of the hybrid (wheat stem rust × rye stem rust) scabrum rust with added virulence for resistance gene Sr21.

Oat stem and crown rust

The sample of oat stem rust received from Canowindra in NSW on the 25th May was pathotype 30-1,2. On the 23rd June a sample of oat stem rust was received from Jamestown in South Australia. The samples were taken from crops of Yallara and Wallaroo.

The oat crown rust sampled on wild oats near Eugowra in NSW in May was determined to be pathotype 0001-0. Since then samples have been received from Godfreys Creek in NSW on the 15th July and Yass on the 23rd July. The sample from Yass was collected from Eurabbie and Bimbil.



More news from: University of Sydney


Website: http://sydney.edu.au/agriculture/plant_breeding_institute/index.shtml

Published: July 28, 2014

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