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Same ol’ yellow spot hasn’t changed a bit

We talk about mutations a lot at the CCDM, as diseases are always mutating. But there’s one disease that’s been around for a while and hasn’t changed that much, and that’s yellow spot. The 2015 results from Stop the Spot are now in, which allowed our researchers to analyse 145 diseased-leaf samples sent from a…Continue Reading

Can’t keep up control with just Tebuconazole

The first signs of a wheat powdery mildew mutation have now been observed in our laboratories, coming from samples collected across NSW and Tasmania. Madeline Tucker of CCDM’s Fungicide Resistance Group seems to think that this mutation could limit the efficacy of the popular active ingredient tebuconazole for use on wheat powdery mildew. The discovery…Continue Reading

The tale of a mutant fungus missing three genes

Once upon a time, a wheat leaf with septoria nodorum blotch (SNB) was sent to CCDM laboratories. CCDM researchers got to work on this sample, separating the fungus from the leaf, and ultimately ‘deleting’ three genes responsible for causing disease symptoms. The result was a genetically modified mutant strain of SNB without three genes. CCDM’s…Continue Reading

The fungi-side story of sclerotinia

Sclerotinia is a tough nut to crack – we still don’t know how it infects its host plants – and fungicide application is still the number one way to control the disease. But with only four active ingredients available to growers, and no resistant cultivars yet released, our newly established sclerotinia team thought now was…Continue Reading

Avoiding a Slippery Slope in Wheat Powdery Mildew

It wasn’t long ago when barley powdery mildew spread a white blanket across WA’s broadacre region. Now, wheat powdery mildew has begun to cause havoc, as favourable conditions and extensive plantings of susceptible varieties have seen the disease thrive in the WA’s central and northern wheatbelt. While it’s easy to compare the two diseases –…Continue Reading

Yellowing in Mace – should we be concerned?

It was a close call for a moment, but we can confirm Mace continues to hold a reasonably robust disease resistance profile. But there have been a growing number of reports suggesting otherwise, with growers across Western Australia observing yellow blotching on their Mace leaves. Since its release in 2008, Mace has dominated wheat paddocks…Continue Reading

Mixing fungicides matches good management

It may be an age-old tactic – but now it has been proven in practice: Mixing fungicides is a successful tactic to delay fungicide resistance. Not long ago, we saw powdery mildew reach epidemic levels across Western Australia. Part of the cause was from relying on fungicides with one mode of action, the demethylation-inhibiting (DMI)…Continue Reading