Evaluation of herbicide resistance from a point of view of integrated plant protection within a system of a 4-field crop rotation including glufosinate-resistant rape and maize

The present study evaluates, from a point of view of integrated plant prote ction, short-term and longterm crop protection effects found in a long-term trial with transgenic herbicide-resistant winter rape and maize. The trial started in 1996 and includes a 4-field crop rotation. Main points of consi deration are the use of injury and control thresholds, control of volunteer rape, and an ecological evaluation of established and new herbicide strate gies. Outcrossing of herbicide resistance is part of accompanying agroecolo gical research. Use of LIBERTY (Glufosiant-ammonium) in rape and maize led to similar resul ts as standard herbicides. There were no significant differences in yields. Systems with herbicide-resistant rape and maize have a smaller biological risk potential than conventional systems. Outcrossing rates in rape fields were clearly below 1%. Higher rates were o bserved only in directly neighbouring fields.