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.