No sign of any change, with Rhynco still sensitive to azoles, SDHIs and strobilurins. Prothioconazole remains particularly efficacious.
Pay attention to AHDB recommended list resistance ratings, all 6 row feed varieties on the 2018 list score 7. Programmes based around prothioconazole with SDHIs and/ or strobs included will provide the best control.
The UK population remains fully sensitive to azoles, however there is reduced efficacy to SDHIs due to the H277Y mutation. The frequency of the F129L strobilurin mutation varies across the country.
Due to its quick lifecycle, timing is critical for net blotch control. Pay particular attention to the gap between T1 and T2 – a gap longer than 4 weeks is highly risky.
Isolates with severely reduced sensitivity to ALL azoles and/ or ALL SDHIs are present in the UK population. Ramularia remains sensitive to multisites.
Crop stress is a significant factor in severe Ramularia epidemics, keeping the crop clean of all disease and stress free will help limit the impact. Unless the Ramularia risk is very low always add a multisite at T2
Do you have seeds of doubt when it comes to identifying seed- and soil-borne diseases?
Replacing neonicotinoid seed treatments is going to be a significant challenge over the coming years, and unfortunately there is no silver bullet to succeed them. Focusing on wheat and barley, here are some options to consider.