Results of screening assays conducted between 2000 and 2004 by 13 organisations/companies were collated in order to update the information on the status of resistant weeds of arable crops in Great Britain, last compiled in 1999. Resistant Alopecurus myosuroides (black-grass), has now been found on 2085 farms in 31 counties, resistant Lolium multiflorum (Italian rye-grass) on 324 farms in 28 counties and resistant Avena spp. (wild-oats) on 218 farms in 26 counties of England. Resistant populations were found over a wide geographical area but no resistant grass-weeds have so far been confirmed in Wales or Scotland. Two ALS-resistant broadleaved weeds were identified for the first time in the UK. Resistant Stellaria media (common chickweed), first detected in 2000, was found on 15 farms in six counties of Scotland and five counties of England. Resistant Papaver rhoeas (common poppy), first detected in 2001, was found on 11 farms in seven counties of England.
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