Abstract
One-day-old male and female Dendroctonus frontalis produced the pheromone trans-verbenol when treated topically with JH-II or methoprene. JH stimulated production of endo-brevicomin in 5-day-old and emergent males. These results suggest that JH mediates pheromone synthesis in D. frontalis, although the stimulus initiating JH production is not known. JH treatment generally decreased the pheromone content of 5-day-old or emergent adults, indicating that pheromone release may also be stimulated.