Levels of the pesticide terbutryn in German rivers have not fallen,despite having been banned in 2003,say environmental researchers.Terbutryn belongs to the group of triazine herbicides,which work by inhibiting photosynthesis,and were once widely used for agricultural weed control.However,due to their persistence in aquifers and consequent threat to drinking water,many triazine herbicides were banned in the 1990s.Terbutryn itself,which is slightly toxic to humans,was banned from agricultural use in Germany in 2003,but it seems that levels of the pesticide in rivers have not fallen.
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