Cornell University scientists have conducted research on pheromones of the grape berry moth for nearly 20 years. These efforts provided a foundation for the development of the Isomate- GBM?* pheromone product. This product received EPA and New York State registrations in 1990. The purpose of this bulletin is to describe the impressive results obtained with the Isomate-GBM? pheromone in large-scale field trials conducted throughout New York, and to provide instructions on how to use the pheromone product most effectively.