The Fungicide Resistance Action Group (FRAG-UK)
This web page hosts the latest guidance from the Fungicide Resistance Action Group (FRAG). The 'Download' button provides background. Scroll down for guidance.
The AHDB-supported Resistance Action Groups (RAGs) are informal, UK-based groups consisting of experts from the Crop Protection Association (CPA) member companies, other representatives from the agrochemical industry, a range of independent organisations, including public-sector research institutes, and the Chemicals Regulation Directorate (CRD).
The groups are completely independent of AHDB and work to produce guidance on pesticide resistance issues. As part of its support to the resistance action groups, AHDB publishes their guidance.
Note: FRAG information published before 2016 can be accessed via the National Archives
How fungicide resistance happens
Usually, fungicides control susceptible fungal strains effectively. However, any resistant strains present – through mutation or natural variation – are more likely to survive and reproduce. This process of ‘selection’ makes each subsequent generation more difficult to control. In the absence of any fitness costs, resistant strains may come to dominate the population, causing disease control to fail. This video by the Fungicide Resistance Action Committee (FRAC) explains why fungicide resistance happens and how to manage it.