Sex pheromone-associated behavior of two tortricid moths in New Zealand, Planotortrix notophaea and P. octo, was studied in a laboratory. Most males of both species changed their antennal posture responding to the change from light to dark phase. Three antennal postures in both sexes were designated by dorsal view: antennae in resting position, those extended less than 80$^{circ}$from body axis, and those extended more than 80$^{circ}$from the body axis. In P. notophaea, antennal posture of males appeared as an external indicator representing the physiological readiness for pheromone perception; males with antennae extended more than 80$^{circ}$from the body axis responded better than those in resting position. Bioassays with medicine droppers indicated that threshold concentrations for male response to crude female pheromone extract were 3$ imes$$10^{-3}$ female equivalents(FE) and 3$ imes$$10^{-7}$ FE in P. notophaea and P. octo, respectively. In P. octo, threshold concentrations for male response to known pheromone compounds, (Z)-8-tetradecenyl acetate and tetradecyl acetate, were 10 fg and 100 fg, respectively. Female calling appeared continuous rather than being pulsed. In P. notophaea, stronger male responses were elicited toward females with antennae extended more than 80$^{circ}$from the body axis than those in resting position.