Concentrations of pesticides, used in high amounts in Europe (isoproturon, 2,4-dichlorophenoxy acetic acid (2,4-D), atrazine, chlortoluron, bromoxynil, terbuthylazine, metamitron, bentazone, ethofumesat, metazachlor, pendimethalin, phenmedipham, desethyl-atrazine (DEA) and desisopropyl-atrazine (DIA)) were determined in stemflow of beeches and in rainwater in the northern low-lands of Germany. Recoveries after solid phase extraction of all compounds varied in a wide range in spiked stemflow samples with respect to the individual compounds as well as to different trees...