The most topical conversation among our tillage farmers stems from the recent discovery at Teagasc. Researchers have identified new strains of Septoria Tritici on wheat, with reduced sensitivity to the SDHI group of fungicides. The most insensitive of these strains have been found at a low frequency at Teagasc Oak Park, Carlow following routine sampling at the end of the 2015 season.
Septoria Tritici in Wheat
According to Teagasc, in laboratory tests these strains survived up to 100 times the concentration of SDHI fungicides compared to the most insensitive strains found in previous years. An additional, as yet unidentified strain showing reduced sensitivity (although not as extreme as those found at Oak Park), was also identified in a crop in the north east of the country. These strains have not previously been found in field populations and therefore their ability to survive the winter remains unknown. This will be closely monitored early in the spring to see if there are any further developments.
Control and Treatment of Septoria Tritici in Wheat
We believe that good Septoria Tritici Blotch control will still be possible with SDHI Fungicides in the coming season but it does mean that any increase in their frequency will threaten the future efficacy of this very valuable group of Fungicides. The mantra of the last few seasons to apply high rates of SDHI, coupled with Triazoles and multi site Fungicides (chlorothalonil) will be paramount next season. This will be one of our best methods to try and keep these resistant strains at bay.
Apart from this breaking news, activity on tillage farms at the moment is reasonably quiet with most field work completed. Crops have developed well and are looking really good at present which has been due to the second mildest November since records began. The next stage of activity should be on target for early February when decisions will be made on first splits of fertiliser on Cereals and Oilseed Rape. We will also be monitoring OSR for light leaf spot levels in the month of February.
At Connolly’s RED MILLS the tillage team advise tillage farmers to use good anti-resistance practices. For further crop management advice contact any member of the Connolly’s RED MILLS agronomy team here.
- SDHI Fungicides
- Septoria Tritici
- Winter oilseed rape