Electroantennogram responses of synthetic periplanone-A and periplanone-B in the american cockroach

The electroantennogram responses of synthetic (-)-periplanone-B (PB) and (-)-periplanone-A (PA) were evaluated by using the antennae of the unmated male American cockroachPeriplaneta americana L. The threshold concentrations of the pheromone activities for the two chemicals were similar. Neither a synergistic nor an inhibitory response was noted, and only an additive effect was detected when PA and PB were applied as a mixture.