Phorid fly, Pseudacteon tricuspis, response to alkylpyrazine analogs of a fire ant, Solenopsis invicta, alarm pheromone

► Pseudacteon tricuspis is a parasitoid of fire ants. ► P. tricuspis uses host fire ant chemicals for host location. ► We investigate its response to host alarm pheromone and related compounds. ► P. tricuspis females are attracted by fire ant alarm pheromone.