Absorption and translocation of foliar-applied 2,4-D and amitrole were studied in shoots of the Tokay grape. The major aspect of this study involved investigating the relationship of the position of the treated leaves to the fruit clusters and to the age of the clusters. The techniques of autoradiography--extraction and purification, counting, and chromatography—were used. Such studies were conducted at various periods following application, the maximum time lapse being 112 days.
