Maximising the effective life of fungicides to control oilseed rape diseases, through improved resistance management

Project number 21120015

Lead partner Rothamsted Research

Scientific partners ADAS

Industry partners BASF, ADAMA, DuPont, Syngenta, Bayer CropScience

Start date January 2017

End date June 2021

AHDB Cereals & Oilseeds funding £160,966

The challenge

There is a strong rationale that the current widespread use of solo active substances (modes of action) in oilseed rape fungicide programmes represents a poor anti-resistance strategy. Pyrenopeziza brassicae (light leaf spot) strains with decreased sensitivity to azoles have been identified in the UK. Fungicide resistance to succinate dehydrogenase inhibitors (SDHIs) has been reported for Sclerotinia sclerotiorum (sclerotinia stem rot) in Europe and azole insensitivity has been detected in Leptosphaeria maculans (phoma stem canker) in Australia. Such strains are likely to occur here.

The project

There is a need for evidence-based guidance to demonstrate appropriate anti-resistance strategies for the industry to demonstrate which fungicide resistance management tactics would be most effective at slowing fungicide resistance selection. Fungicide anti-resistance strategies deployed must also be cost effective for growers. Hence, this project has four objectives: 

1. Determine the risk of fungicide resistance affecting fungicides used against the major oilseed rape diseases

2. Test which anti-resistance management strategies are most effective at slowing fungicide resistance selection in P. brassicae comparing application of solo products against mixture and alternation strategies

3. Conduct an economic analysis of fungicide anti-resistance management strategies for the industry

Objectives 1 and 2 are funded by AHDB Cereals and Oilseeds

Objective 3 is funded by crop protection industry contributions

The benefit

The target users and beneficiaries will be growers and advisors. By conducting an analysis of the risk of resistance development for the different chemical groups used to control the major foliar diseases on oilseed rape in the UK, there will be evidence to demonstrate the relative risk for selecting for fungicide insensitivity with current practice. This can be used to support changes in practice identified in this project. 


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