Friends of the Earth is calling on the Government to halt outdoor trials of GM crops and to prosecute the GM company Aventis, after finding a field of GM 'weeds' growing illegally in Lincolnshire. Oilseed rape 'volunteer' plants [1], already in flower, have been found at a site used earlier in the year in the Government's GM Farm Scale Evaluations [2].  The biotech company Aventis is legally responsible for ensuring that these GM volunteer weeds do not survive to the flowering stage.  If they flower, GM 'volunteers' may contaminate non-GM oil seed rape plants and wild relatives.  FOE has written to the Secretary of State, Margaret Beckett, urging her to order the immediate destruction of the weeds and to prosecute Aventis for breaching their consent to release GMOs.