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Latest News

Agriculture Innovation Update

Wednesday June 12  Tintinara Memorial Hall, 1.15pm – 7.30pm

Go for the afternoon or just the session that interests you

 

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Crop Nutrition in the High Rainfall Zone (HRZ)

Tuesday June 18

8.30 - 11am

Starting at Struan House, followed by a site visit to Bool Lagoon

 

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Pulse Check: Coonalpyn/Coomandook Post seeding meeting

Tuesday June 18, 9am

1154 Werrimrook Road, Coomandook

 

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Wanted: yellow spot samples to Stop the Spot!

Latest News >>

 For the third year running, growers and advisors are being encouraged to take part in Stop the Spot and send in samples of leaves with yellow spot to researchers of the Centre for Crop and Disease Management.

 

In return, the CCDM yellow spot team will tell the sender in a month or two if their sample is indeed yellow spot.  

 

CCDM yellow spot researcher Dr Pao Theen See, said her team received 145 samples from the 2015 campaign, and from closer examination in the laboratory, only 56 per cent were confirmed to be infected with yellow spot.

 

“Yellow spot can be tricky to identify, in the past it has been mistaken as the cause for leaf yellowing, and is often confused with other leaf spot diseases,” Dr See said.

 

“Nevertheless, yellow spot infections were found to be widespread across Australia with the disease found in the western, southern and northern grain growing regions.”

 

Dr See said the Curtin University and Grains Research and Development Corporation (GRDC) supported-CCDM campaign aims to develop tools and markers for wheat breeders to help them release more resistant varieties for growers.

 

She said one of the more interesting results from last year’s Stop the Spot campaign was that almost half the yellow spot disease samples received were from wheat varieties which were rated as having resistance.

 

 

Why resistant varieties were received

Dr See said 46 per cent of the confirmed yellow spot samples were from varieties rated moderately resistant or moderately resistant/moderately susceptible.

 

“Yellow spot was found in varieties such as Mace, Magenta and Wyalkatchem, which indicates that even putatively-resistant varieties can be susceptible to the disease,” she said.

 

“This also highlights how vital it is that yellow spot is continually monitored so we can respond to any changes in the pathogen population.

 

“These varieties are not damaged by ‘Tox A’ - the most potent of known effectors (disease-causing toxins) within the yellow spot pathogen – as the wheat gene that interacts with ToxA was bred out of them.

 

“The reason they still get infected is because there are other damaging effectors in Australia including ToxC and others that are so far unknown.”

 

Dr See said it was still recommended that growers chose varieties ‘insensitive’ to ToxA, as ToxA was the most potent of the identified effectors.

 

“Growers who choose resistant varieties may get some yellow spot infection but not as much if they grow susceptible varieties,” she said.

 

Key Findings from the results

 

The main findings from genetic and molecular analysis of samples across Australia:

 

  • Yellow spot is nationally widespread
  • MR and MRMS varieties were found to be vulnerable to yellow spot infection
  • Australian yellow spot has one predominant race we know of (ToxA and ToxC)
  • ToxB was not detected, but it is currently present overseas and is a major biosecurity risk
  • No mutation was detected in the ToxA gene
  •  

For a more detailed report, click here .

 

 

How good are you at detecting yellow spot?

Only 56 per cent of people who sent in samples last year correctly diagnosed the disease as yellow spot – can you do better?

If you think you have yellow spot, the CCDM would love a sample. In return, the yellow spot team can confirm if you were correct, following molecular and genetic analysis of the sample, which can take a number of weeks.

 

Get involved and visit www.stopthespot.com.au for sampling instructions.

 

 

For disease management information:

Information about yellow spot management in wheat is available at www.grdc.com.au/grownotes or www.grdc.com.au/HT-YellowspotInWheat

 

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