The policy in the Netherlands is to signifiantly reduce the use of herbicides, also on pavements. Existing non-chemical methods to control weeds are much less effective than spot spraying, the usual method at this moment. Therefore, the cost of non-chemical weed management is often estimated to be 4 to 5 times the cost of chemical weed control. However, independently measured data on the effectiveness of spot spraying, of current non-chemical methods and of potentially improved non-chemical methods were not available. This was particularly the case for a situation under continuous non-chemical weed control. The objective of the research described here was to determine the effectiveness of existing and experimental non-chemical methods, and of spot spraying
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