Approaches and Objectives of Arable Weed Species Mapping

Changes in weed spectra may be the result of a great variety of factors, such as changes in plant management. The European Weed Research Society (EWRS) weed mapping working group has systematically documented and analysed data since 2009, which may be used for the prediction of weed changes. The EWRS working group on weed mapping produced a first overview on the three most common monocotyledonous and dicotyledonous weeds in the three most important arable crops in Europe: winter cereals, maize and oilseed rape. A number of scientists within the EWRS weed mapping working group are interested in the distribution of weeds on regional or field levels. The proceedings of the 2011 workshop refer to a few examples of local mapping approaches. One major aspect of these is the assessment of risks associated with different infestation levels and the site-specific control of weeds in arable fields.