Genetically modified herbicide-tolerant (GMHT) crops are being grown in many parts of the world. The EU will soon make a decision on their commercialization in Europe. It is not easy for legislators to reach conclusions as to the risks and benefits. This paper looks at the information emerging from countries where these GMHT crops are already commercialized, and identifies the benefits and problems. It then looks at issues especially relevant to the UK and not fully covered by the field experiences elsewhere, and where specific European research projects have endeavoured to find answers. It seeks to identify the benefits and the real problems for the UK that need to be resolved prior to commercialization.
BeckieH. J. (2001), ‘Impact of herbicide-resistant crops as weeds in Canada’, Brighton Crop Protection Conference – Weeds, Vol 1, pp 135–142.
2.
BeversdorfW. D.Weiss-LermanJ., and EriksonL. R. (1980), ‘Registration of triazine resistant Brassica napus germ-plasm (Reg No GP2)’, Crop Science, Vol 20, p 289.
3.
DevineM. D., and ButhJ. L. (2001), ‘Advantages of genetically modified canola – a Canadian perspectiv e’, Brighton Crop Protection Conference – Weeds, Vol 1, pp 367–372.
4.
DewarA. M.MayM. J.WoiwodI. P.HaylockL. A. (2003), ‘A novel approach to the use of genetically modified herbicide tolerant crops for environmental benefit’, Proceedings of Royal Society, London, B, Vol 270, pp 335–340.
5.
EasthamK., and SweetJ. B. (2002), Genetically Modified Organisms (GMOs): The Significance of Gene Flow Through Pollen Transfer, European Environment Agency Report 28, Luxembourg.
6.
FirbankL. G.DewarA. M.HillM. O.MayM. J. (1999), ‘Farm-scale evaluation of GM crops explained’, Nature, Vol 399, pp 727–728.
7.
HallL.TopinkaK.HuffmanJ.DavisL., and GoodA. (2000), ‘Pollen flow between herbicide-resistant Brassica napus is the cause of multiple-resistant B. napus volunteers’, Weed Science, Vol 48, pp 688–694.
8.
HeapI. (2002), ‘International survey of herbicide-tolerant weeds’, Website: www.weedscience.org.
9.
JamesC. (2003), Global Review of Commercialised Transgenic Crops: 2002, International Service for the Acquisition of Agri-biotech Applications, New York (also Website: http://isaaa.org).
10.
LutmanP. J. W., and SweetJ. (2000), ‘Field experimental programmes in Great Britain to evaluate the environmental and agronomic consequences of growing herbicide tolerant crops’, XIeme Colloque International sur la Biologie des Mauvaises Herbes, Dijon, pp 643–650.
11.
LutmanP. J. W.FreemanS. E., and PekrunC. (2003), ‘The long-term persistence of seeds of oilseed rape (Brassica napus) in arable fields’, Journal of Agricultural Science (in press).
12.
LyonD.J.BussanA.J.EvansJ.O.Mallory-SmithC.A., and PeeperT.F. (2002), ‘Pest management implications of Glyphosate-resistant wheat (Triticum aestivum) in the Western United States’, Weed Technology, Vol 16, pp 680–690.
13.
MorrisonL. A.CremieuxL. C., and Mallory-SmithC. A. (2001), ‘Infestations of jointed goatgrass (Aegilops cylindrica) and its hybrids with wheat in Oregon wheat fields’, Weed Science, Vol 50, pp 737–747.
14.
MoyesC. L.LilleyJ. M.CasaisC. A.ColeS. G.HaegerP. D., and DaleP. J. (2002), ‘Barriers to gene flow from oilseed rape (Brassica napus) into populations of Sinapis arvensis’, Molecular Ecology, Vol 11, pp 103–112.
15.
OwenM. D. K. (2001), ‘Importance of weed population shifts and herbicide resistance in the midwest USA corn belt’, Brighton Crop Protection Conference – Weeds, Vol 1, pp 407–412.
16.
PowlesS. B.Lorraine-ColwillD. F.DellowJ. J., and PrestonC. (1998), ‘Evolved resistance to glyphosate in rigid rye-grass (Lolium rigidum) in Australia’, Weed Science, Vol 46, pp 604–607.
17.
RiegerM. A.LamondM.PrestonC.PowlesS. B., and RoushR. T. (2002), ‘Pollen-mediated movement of herbicide resistance between commercial canola fields’, Science, Vol 296, pp 2386–2388.
18.
ScottS. E., and WilkinsonM. J. (1998), ‘Transgene risk is low’, Nature, Vol 393, p 320.
19.
SnowA. A.AndersenB., and JorgensenR. B. (1999), ‘Costs of transgenic herbicide resistance introgressed from Brassica napus into weedy B-rapa’, Molecular Ecology, Vol 8, pp 605–615.
20.
SquireG. R.AugustinN.BownJ.CrawfordJ. W. (1999), ‘Gene flow in the environment – genetic pollution’, Annual Report Scottish Crop Research Institute 1998/99, pp 45–54.
21.
VanGesselM. J. (2001), ‘Glyphosate resistant horseweed from Delaware’, Weed Science, Vol 49, pp 703–705.
