Early growth boost claimed from SDHI wheat seed treatment

The first SDHI fungicide seed treatment for winter wheat will be widely available this autumn to control a range of seed-borne diseases and give a boost to early growth.

Vibrance Duo, from Syngenta, contains the new second-generation SDHI sedaxane, developed for seed treatment use, as well as fludioxonil, which is found in the group’s Beret Gold.

Sedaxane’s low dose and limited mobility means it does not have any activity against foliar disease, such as septoria, so its use will not reduce the number of foliar SDHIs that can be made.

Therefore, it will fit in with the latest industry guidelines, which permit the use of just two foliar-acting SDHIs to a single crop.

See also: Competition to give some respite on fungicide price rises

Two actives

Syngenta claims having two complementary actives in one product helps control diseases that threaten crop establishment and also give a boost to early rooting.

“Improved rooting is associated with better water and nutrient uptake,” says Mark Bullen, Syngenta’s seed and seedcare campaign manager.

Mark Bullen

“Our trials have shown that Vibrance Duo has a contribution to make to root health, bringing another dimension to a seed treatment’s role in improving crop establishment,” he adds.

Approved for use on winter wheat, winter rye, winter triticale and spring oats, Vibrance Duo contains 25g/litre of sedaxane and 25g/litre of fludioxinil and is used at 2litre/t on winter cereals and 1litre/t on spring oats.

Sedaxane family

Root growth following various treatments

Syngenta says their seed treatment, Vibrance Duo, has a contribution to make to good wheat root health

Its launch marks the start of a planned family of seed treatments based on sedaxane, for cereals and other crops, set for launch in the next few years.

Michael Tait

Michael Tait

“Sedaxane works in the same way as other SDHIs. It is active in the mitochondria, inhibiting cellular respiration and depriving the fungus of energy,” explains Michael Tait, the group’s seed care technical expert.

Highly effective against the key seed-borne diseases, the product is also active against soil-borne diseases, such as rhizoctonia and certain fusarium species.

“There are no label claims for soil-borne disease yet, but we are working towards getting them,” adds Mr Tait.  

The company claims the new treatment improves yield by 0.15t/ha compared with other dressing and lifts the yields compared with untreated seed by 0.5t/ha.

Trials Performance

Jonathan Ronksley

Jonathan Ronksley

“At standard drilling dates in early October, there were increases in rooting and foliage weight with Vibrance Duo, compared to a standard treatment,” reports Jonathan Ronksley, the company’s field technical specialist.

“At later, early December drilling dates, when the products were put under more pressure, in addition to the rooting and top growth increases, there was also a speed of establishment effect,” adds Dr Ronksley.

The on-farm price of Vibrance Duo is £100/t, which is equivalent to about £20/ha, depending on the seed rate used. In comparison, existing treatments retail for £50/t.

  • All the speakers were attending a launch event for the new seed treatment earlier this month

Disease spectrum of Vibrance Duo


  • Seed-borne snow mould (Microdochium nivale, now renamed as Monographella nivalis)
  • Septoria nodorum
  • Seed-borne Fusarium culmorum
  • Common bunt (Tilleta caries)
  • Loose smut (Ustilago tritici)

Moderate control

  • Seed-borne ear blight (Fusarium graminearum)

 At a glance: Vibrance Duo

  • Based on new SDHI sedaxane, plus fludioxonil
  • Approved on winter wheat, winter triticale, winter rye and spring oats
  • Applied at 2litre/t on winter cereals, 1litre/t on spring oats
  • Can be used along with two foliar-acting SDHIs
  • Establishment disease control and improved root health

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