AbstractThe introduction of genetically modified (GM) crops has caused a fierce public debate in Europe. Much of the controversy centres on possible risks to the environment. A specific problem here is that risk perception of the scientific experts differs from that of the public. In this paper, risks associated with herbicide‐resistant crops are presented from the point of view of experts and lay people. In the public perception, herbicide‐resistant (HR) crops are troublesome because of their association with two technologies: genetic engineering of crops and the use of herbicides. These technologies are perceived as risky because they seem to share certain features: in particular, their long‐term effects are unknown and they are dreaded. Other value questions also come into play. The public seems to be concerned that risks are not outweighed by usefulness, that using HR crops is the wrong path to sustainable agriculture, that the individual's right to choose GM‐free products may be violated, and that these crops are unnatural. In contrast, on the issue of the uncertainty inherent in risk assessment, experts and the public seem to share a good deal of ground. Copyright © 2005 Society of Chemical Industry