Abstract--The aggregation pheromone of Gnathotrichus retusus was isolated and identified as (S)-(+)-sulcatol (6-methyl-5-hepten-2-ol). In laboratory and field experiments, G. retusus responded to (S)-(+)-sulcatol, but not to (_+)-sulcatol, which was attractive to the sympatric species, G. sulcatus. G. sulcatus did not respond to optically pure (S)-(+)-sulcatol, but began to respond when t> 1% (R)-(-)-sulcatol was present in an enantiomeric mixture.

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