The sex pheromone of the grape berry moth, Paralobesia viteana (Clemens), was identified as cis-9-dodecenyl acetate (c9-12:Ac), and preliminary trapping experiments indicated that the attractant pheromone could be synergized by several compounds, such as dodecyl and nonyl acetates (Roelofs et al. 1971). Since this insect is the most important fruit-infesting pest of grapes throughout the States E of the Mississippi River, there is much interest in utilizing the pheromone for monitoring and/or controlling this species. Tests in 1972 and 1973 were designed to define an optimum release rate and cis-trans ratio for the attractant, and to compare various trap designs.