STUDY OF FUNGICIDE RESIDUES IN THE GRAIN OF FUNGICIDE-TREATED WHEATS - II - PROPICONAZOLE-BASED AND BROMUCONAZOLE-BASED FUNGICIDES

The aim of the present study was to detect the residues of propiconazo le-and bromuconazole-based fungicides in flour and bran produced from grain of 4 fungicide-treated wheats by gas and liquid chromatography. When Tilt 250 EC was applied in the 1-2 nodes stage of the stem develo pment propiconazole could be detected in the flour of two wheat variet ies. In bran no propiconazole residues were detected in any of the var ieties. In case of treatment carried out in a later phenophase - after development of the flag leaf and in the beginning of heading - propic onazole residue could be detected in the flour of only one wheat varie ty. The active substance of Granit SC - bromuconazole - was detected i n the flour of only one wheat variety in two cases: on the one hand wh en the fungicide treatment was done in the 1-2 nodes stage of stem dev elopment, and on the other hand when the fungicide treatment was done after the development of the flag leaf, at the beginning of the headin g. In bran no bromuconazole residues were detected for all the varieti es studied. It seems that the residues of the fungicides studied do no t translocate in bran, which is constituted mainly from pericarpium pa rts. Their detection in flour is probably due to the fact that during milling the embryos get mainly into flour and the triazoles can be tra nslocated partly to lipids, and partly to the hydrophobic regions in t he amino acid chains in the gluten molecule.