PHEROMONE-BASED AGGREGATION INORTHOTOMICUS CAELATUS(EICHHOFF) (COLEOPTERA: SCOLYTIDAE)

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Abstract
Two field experiments were conducted to determine ifOrthotomicus caelatus(Eichhoff) was attracted to pine bolts infested with conspecifics and to assess the roles of the sexes in attraction. Traps baited with pine bolts artificially infested with males attracted both males and females, but traps baited with uninfested bolts or bolts with females caught very low numbers of beetles. The addition of females to bolts with males reduced the attraction produced by males in a second experiment. Bolts with males and females did not reduce the attraction produced by other males in adjacent bolts, suggesting that females do not produce a masking pheromone. The pheromone system ofO.caelatusis similar to those known for other species in the Ipini in which males initiate gallery construction, produce an attractant, and attract females and opportunistic males. Preliminary gas chromatographic analyses of extracts of hindguts and frass from males boring on pine bolts suggested the presence of ipsdienol and ipsenol, two commonly occurring pheromones in other species of the Ipini. The pheromone system ofO.caelatusis discussed with regard to the complexity of the pine bark beetle guild in the southeastern United States.

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