Current status of herbicide-resistant weeds in the United Kingdom

摘要

This paper updates information on the status of resistant weeds of arable crops in the UK, last compiled in 2005. It is estimated that resistant Alopecurus myosuroides (black-grass) occurs on at least 80% of the 20,000 farms that spray regularly for control of this weed. Resistance to mesosulfuron+iodosulfuron, first used in the UK in autumn 2003, has been detected on > 400 farms in 26 counties of England. Lolium multiflorum (Italian rye-grass) resistant to at least one herbicide mode of action has been found on > 450 farms in 33 counties and resistant Avena spp. (wild-oats) on > 250 farms in 28 counties of England. ALS-resistant Stellaria media (common chickweed) was found on > 40 farms in 13 counties in England, Scotland and Northern Ireland. Thisrepresents the first documented case of a herbicide-resistant weed in Northern Ireland. ALS-resistant Papaver rhoeas (common poppy) was found on > 25 farms in nine counties of England. ALS-resistance in Tripleurospermum inodorum (scentless mayweed) wasdocumented for the first time in England, with resistant populations being found on three farms in Yorkshire. Partial resistance to the triazinone herbicides, metribuzin and metamitron, was also documented for the first time in England in Senecio vulgaris (groundsel), which also showed complete resistance to triazine herbicides.