The Weed Resistance Action Group (WRAG) produces guidance on pesticide resistance issues. Hosted by AHDB, this information can be used to help protect crops and the long-term efficacy of herbicides.

The AHDB-supported Resistance Action Groups (RAGs) are informal, UK-based groups consisting of experts from the CropLife UK member companies, other representatives from the agrochemical industry, a range of independent organisations, including public-sector research institutes, and the Chemicals Regulation Directorate (CRD, part of HSE).

Find lots of information and resources on the AHDB website here - https://ahdb.org.uk/knowledge-library/the-weed-resistance-action-group-wrag and/or join the WRAG LinkedIn group at https://www.linkedin.com/groups/12757011/ 

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A weed can have many definitions, one being, any plant growing in a place it is not wanted. This topic focuses mainly on weeds affecting agriculture. Generally weeds are classified into two groups: grass-weeds (e.g Black-grass, Italian ryegrass, Bromes) and broad-leaved weeds (e.g Mayweed, Chickweed, Poppy, Cleavers). 

Crop protection refers to practices and measures employed in agriculture to safeguard crops from both biotic (pests, diseases and weeds) and abiotic (environmental factors) stresses. They key goal of crop production is to maintain crop productivity, health and quality whilst minimising yield losses.

Herbicide resistance is the inherited ability of a weed to survive a rate of herbicide which would be lethal to a member of the normal population. It can develop over time based on repeated selection pressure imposed on the weed. This selection pressure changes the population from susceptible to resistant. Herbicide resistance is becoming an increasing problem in UK agriculture, in both grass weeds and broad-leaf weeds. See also the general topic on herbicides.

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AHDB Guide from 2021 incorporating WRAG guidelines. Weed control is vital for high yields of good-quality crops and to prevent the spread of pests and diseases, e.g. ergot. Yet with fewer active ingredients, a need to protect water and manage herbicide resistance, the weed challenge must be managed across the rotation.