Traps baited with sex attractants ( 1 pheromone 1 traps) are presently being used by a number of farmers in Central Queensland to monitor P. scutigera populations and for timing insecticide sprays. However, there is conflicting evidence in the published literature as to the best type of attractant to use. Rothschild (1975) concluded that the Z,Z isomer of 7, 11-hexadecadien acetate (7 , 11-16 : Ac) was adequate for monitoring purposes and was used in subsequent experiments (Rothschild 1983) . In contrast, Flint and Stone (1985) found that traps baited with a 9:1 ratio of Z,Z to Z,E isomers caught significantly more moths than Z,Z only baited traps .