11/8/20 - For barley growers, and the industry, the most surprising thing about the uncompromisingly thorough defeat of SDHIs by Ramularia was how suddenly it happened. The implications of that for ongoing crop security and the protection of existing and emerging chemistry won’t have been lost on anybody.
Crop protection company ADAMA NZ, a long-time advocate of adding multi-sites to control Ramularia in barley and Septoria in wheat, described the collapse as “dramatic”. It was barley that was impacted this time, but ADAMA NZ also say continuing vigilance in wheat is vital. In the UK, often a bellwether for this country, triazoles are currently only giving around 35-40% Septoria control in wheat, down from 80-90%.
While multi-site protectant fungicide Phoenix, has provided a very effective addition to the Ramularia control toolbox, the failure of SDHI fungicides was a sobering reminder of how rapidly a crop that looks very promising can be stripped of its value.