A simplified method has been developed for the quantitative determination of aldicarb and its oxidation products, the sulfoxide and sulfone, in oranges, potatoes, carrots, corn, green beans, and silage. The method involves quantitative extraction from plant matrix, separation of aldicarb, the sulfoxide, and the sulfone on a liquid chromatographic column, oxidation to the sulfone, and GLC determination of the sulfone, using a sulfur mode-flame photometric detector. This method has a limit of detection of 0.005 ppm, using a 150 g sample for analysis. Recovery studies were run on a number of crops and silage. Samples of potatoes from Tern ik-trea ted plots were also analyzed.