Research has demonstrated that diapause of the pink bollworm, Pectinophora gossypiella (Saunders), is primarily induced by decreasing photoperiod; however, temperature (Butler et al. , 1978; Sagnia, 1984) and nutrition (Foster and-Crowder, 1980) are interacting factors. Photoperiod is also an important component of diapause termination but other environmental and cultural factors may influence timing and rate of spring emergence (Rice and Reynolds, 1971; Beasley et al., 1985). Specifically, plots of numbers of male pink bollworm moths trapped in the spring suggest the occurrence of bimodal emergence peaks. This report discusses preliminary efforts to relate spring emergence to simulated field conditions in the fall and winter.