Published on 23/11/2023
Words: Syngenta
The results from the first two years of these surveys serve as an early warning to both agronomists and farmers.
These results have shown there has been a slight but expected loss of sensitivity to all the SDHI’s commonly used in wheat.
It is important to note that, to date, no loss of field efficacy has been observed with any of the SDHI’s used to control SLB, including Elatus® Plus (MOA Group 7).
The longevity of commonly used SDHI active ingredients can be prolonged.
However, to do this, some changes to how fungicides are used on-farm need to be made. Syngenta is fully supporting additional guidelines for the use of SDHI fungicides for the control of SLB (issued by FAR in the Arable Update, Cereals: Issue 217), and also stresses the impotance of:
• Restricting the number of SDHI's to one or an absolute maximum of two per season (including any seed treatment).
• Always tank mixing with at least one robust fungicide from a different mode of action group.
• Alternating SDHI active ingredients both within and between seasons rather than repeat applications of the same active ingredient.
• Using alternative mixing partners, ensuring they always have efficacy against the pathogen.
Elatus Plus has a long standing, excellent track record for performance against STB as well as glume blotch, leaf rust and stripe rust.
Vigilance in the area of resistance management will mean growers will have continued access to the high value that Elatus Plus brings to disease control in the wheat market.
Elatus Plus was launched in 2017 to NZ wheat growers. It contains a solo SDHI branded Solatenol® and is approved for use in wheat for the control of leaf rust, stripe rust, speckled leaf blotch (Septoria tritici) and glume blotch (Septoria nodorum).
The ‘Plus’ in the name highlights the need to apply the solo SDHI product ‘Plus’ a DMI mixing partner for resistance management and curative activity.
However, the ‘Plus’ could also refer to more yield because that’s what growers can expect when they use Elatus Plus in wheat.
Syngenta recommends use of Amistar® air induction nozzles for applying Elatus Plus, using water rates of 100-150 litres per ha.
The Amistar nozzle is designed to counter the forward speed on the sprayer, resulting in improved plant coverage and better penetration into the crop.
This results in more chemical reaching lower leaves three and four, where Septoria tritici can spread to infect the all-important flag leaf.
Amistar nozzles can be purchased from Syngenta resellers but they are also available free to growers who purchase qualifying amounts of Elatus Plus or other Syngenta products.
Elatus Plus comes in 10 litre containers with a use rate of 0.75 litres per ha.
It is approved for use in wheat with a withholding period of 42 days for grain, and 28 days for silage.
For more details, including videos, visit www.syngenta.co.nz.