New mode of action fungicide for control of Septoria

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A new mode of action fungicide has demonstrated it effectiveness in trials conducted under challenging conditions during the 2021 winter crop season.

Telbek® with Adavelt® Active, came out of the Corteva Agriscience pipeline for the control of Septoria and other diseases in wheat.

Its release is very timely, as other chemistries used in cereals are coming under increased pressure with a build-up of resistance as a result of prolonged use.

Corteva Integrated Field Science Lead, Tom Loveless, said Telbek® with Adavelt® Active, had a novel mode of action for the group of diseases being targeted.

Corteva Integrated Field Science Lead, Tom Loveless looking at the impressive results from Telbek® with Adavelt® Active fungicide last season.

“It's a Group 21 and the only chemistry within that group that has activity on ascomycetes and some of the basidiomycete rusts,” he said. “It's the only mode of action in that group that's going to be in this sort of market."

Mr Loveless said the main target of Telbek® fungicide was Septoria tritici although it also had activity on a good spectrum of rusts and some Powdery mildew.

The 2021 season was extremely wet in many areas and a good opportunity to showcase Telbek® alongside industry standard fungicides and as part of a fungicide program.

At a trial at Dookie, in northern Victoria, there were numerous treatments of Telbek® compared to products like epoxiconazole with different combinations and spray timings.

Corteva Agriscience team members inspecting Telbek® Adavelt Active trial at Dookie, VIC last season.

“We were really looking at Telbek® going on to protect the top couple of leaves,” Mr Loveless said. “In an area like Dookie, where Septoria can be quite high in intensity, we're really looking at protecting the yield and quality. That means protecting those, those top two leaves.”

Mr Loveless said some of the combinations included Telbek® applied after an Opus application, or in conjunction with other chemistry such as Amistar or Radial.

“What we saw a few weeks after the final application was really good control of Septoria in the top of the plant.”

Septoria, in the untreated control section, was very active at below flag minus three so the ability of Telbek® to hold back the infection and protect the top leaves was impressive.

Tom Loveless & a researcher looking at the impressive results from Telbek® with Adavelt® Active fungicide last season.

The registration of Telbek® for the Australian market is very timely, with many of the major fungicides coming under resistance pressures.

“Resistance is a real potential risk and a current risk in some cases,” Mr Loveless said. “Around the world Septoria has got some real issues with resistance to existing chemistry, particularly in Europe.”

“Even though conditions in Australia are different, we certainly have hotspots of Septoria pressure that are going to be susceptible to a loss of sensitivity to some of the existing compounds”

He said strobilurin and DMI fungicides were being challenged.

“Having another mode of action gives us an option to break reliance on some of those common chemistries and also protect some of the ones that are still currently working.”

“Telbek® has a great fit in programmes as a different mode of action. It is very flexible and can be mixed with many other options.”

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