Byers, J.A. 1981b. Effect of mating on terminating aggregation during host colonization in the bark beetle, Ips paraconfusus. Journal of Chemical Ecology 7:1135-1147.

Female Ips paraconfusus showing rainbow colored stridulatory organ on top of head
Abstract-- Attraction of male I. paraconfusus to male-infested ponderosa pine logs was inhibited by volatiles from logs infested with mated males and females over an 8-day period in the field. The response of females during this time was not significantly inhibited by these volatiles. Synthesis of the male-specific pheromones, ipsenol and ipsdienol, appeared negligible after 8 days in males allowed to mate with 3 females in these logs while males alone contained levels of these pheromones at about half their maximum rate. The decline in pheromone production in mated males appears to result, in part, from a reduction in the activity of the biosynthetic system that converts the host monoterpene, myrcene, to ipsenol and ipsdienol. Mating and feeding have no effect on the biosynthetic system that converts the host monoterpene, (-)-alpha-pinene, to the pheromone, cis-verbenol in either males or females. The reduced production and release of pheromones by males after mating may play a major function in the process of terminating the aggregation phase of host colonization.
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Chemical Ecology