Residue dynamics in giapevine of the nematicide aldicarb (2-methyl-(metbylthio) propionaldehyde-O-(Methylcarbamoyl) oxime) and its biologically similar active metabolites, aldicarb sulfoxide and aldicarb sulfone, were determined by gas chromatographic techniques. Residues were found in the roots, trunks, stems, and leaves of grapevine 120 d after application. Residues in leaves as high as 1.40 and 8.89 ppm resulted from 4.5 and 9 kg ai/ha respectively. In roots, trunks, and stems the residues had also declined after 180 d. No residues were detected in the newly forming immature fruit. Residues in roots, trunks, young branches, and leaves declined further after 270 d, but residues in mature fruit at harvest time were 0.03 and 0.05 ppm from application of 4.5 and 9 kg ai/ha, respectively. In other trials the amount of aldicarb toxic residues found in mature fruit at harvest time varied with grape varieties, time and rate of application, total amount of rainfall, irrigation water, and soil type. Key words: systemic nematicides.