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LAMMA 2021

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Everything you need to know about BASF’s new azole fungicide

Gaining UK authorisation in December, the much-anticipated Revystar XE is available for use cereal in crops this season.

Revysol trials at Oak Park, Ireland.
Revysol trials at Oak Park, Ireland.

Revystar is a formulation of the first isopropanol-azole fungicide active to receive approval for use, Revysol (mefentrifluconazole) and the SDHI Xemium (fluxapyroxad).

 

The new fungicide offers protective and curative activity on all cereals against septoria, rust, mildew, ramularia, rhynchosporium and net blotch, even where resistance has been previously seen, according to

Steve Dennis, head of business development at BASF.

 

This is down to the isopropanol-azole’s ‘flexible’ molecule, which is not found in other cereal fungicides, says Mr Dennis. This ‘linker’ allows the molecule to move ‘very fast’ and fit into mutated binding sites that have changed shape as a result of resistance.

 

Mr Dennis explains: “If your binding site is changing shape, the best thing you can do is get a molecule that can also change shape to fit the target site.

 

“We know that azoles have a slight diversity, with some able to control some populations better than others. Revysol is able to control all of these strains to the same level. It is not concerned about the mutation or strains you have.”


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Ramularia

 

With the loss of ramularia’s most key fungicide, CTL, Revysol can offer some protection against the disease, says Paul Haynes, BASF field sales manager.

 

He said: “In terms of performance, what we’re seeing is as prothioconazole loses its performance due to sensitivity, Revysol is maintaining that.

 

“We know ramularia is largely stress triggered, and Revysol is not going to replace CTL, but it was performing on a par with prothioconazole. However, in the last 12-18 months we have seen prothio slip a bit against ramularia.

 

“Whilst we’re seeing very good activity from Revystar in barley crops, it is about managing the health of that crop throughout. Ramularia is in there from the very early stages of the plant, so it’s all about managing and mitigating stress as much as you possibly can.”

An independent view

 

An average yield response of 0.39tonnes/hectare was seen in ADAS trials where the new fungicide was applied at both T1 and T2.

 

Fifty-one field scale trials looked at the performance of Revystar XE in winter wheat crops at both T1 and T2, and just T2. The trials compared performance of the new fungicide to the farm standard, both with and without the use of CTL.

 

Dr Pete Berry, ADAS crop scientist, says satellite NDVI imagery from the trials indicated greater green area index and deeper greening on plots treated with Revystar.

 

“Most of these effects were visible late on as the crop was senescing, indicating it was prolonging the green area of the crop, and prolonging grain fill.”

 

Reviewing disease levels and green leaf area throughout crop development (see table), Dr Berry adds: “Across all 51 trials we were seeing statistically significant effects on the level of septoria on the flag leaf, with significantly less septoria on the Revystar treatments. There was a greater amount of green leaf area in leaf 2 and leaf 3.

 

“The trials which had the fairest comparison, where CTL wasn’t included in the farm standard, we see a slightly more significant and larger effect of Revystar. There was a significant reduction in septoria levels on leaf 2 and the effects of the green leaf area are slightly larger.”

 

Across all 47 sites, yield maps showed an average yield benefit from Revystar of 0.2t/ha. Where CTL was not included in the farm standard, the yield response was 0.27t/ha, and the 21 trials in which Revystar was applied at both T1 and T2 showed a 0.39t/ha yield response.

 

Disease levels and green leaf area (GLA) across all 51 trials:

Leaf 1 GLA

Leaf 1 septoria

Leaf 2 GLA

Leaf 2 septoria

Leaf 3 GLA

Revystar XE

95.1

0.07

91.9

0.94

77.3

Farm standard

94.5

0.16

90.5

1.41

73.9

Septoria= % of leaf infected.

Source: ADAS

In the field

In Lincolnshire, Alex Borthwick, trialled the new fungicide on a crop of KWS Siskin. He saw a 0.22t/ha yield response by applying the product at T2.

 

He says: “June was the wettest month of the entire year for us. The septoria just jumped up onto the flag leaf after that, even though there hadn’t been much evident in the lower leaves.

 

“Revystar certainly did a job on the septoria in the trial and also increased the yield, with the Revystar treated plot yielding 0.22t/ha above the farm standard.”

 

Although Mr Borthwick trialled the product at T2, he says going forward it would be a better fit for T1.

 

“There it can act as an eradicant, potentially with some kickback, this is after CTL has gone which will keep the plant healthier and lower the disease pressure going into the T2 timing.”

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