Use of Pheromones for Monitoring of the Asiatic Leafroller, Archippus breviplicanus (Lepidoptera: Tortricidae)

II. Comparison between Performance of Pheromone Trap and Light Trap

Abstract

Sex pheromone traps were found to be more useful for the sampling of Archippus breviplicanus for forecasting than light traps. The sex pheromone traps enabled to recover 32.5% of the marked males during one night, a value which was about 10 times higher than that obtained with light traps (3.6%). Most males were caught with the sex pheromone and the light traps at 19-20hr in late May, at 0-1hr in early June, at 2-3hr in the first generation, and at 3-4hr in the second generation. Seasonal profiles of male catches with sex pheromone and light traps, such as dates of 50% catch and of the peak of moving average for 5 days, corresponded well to each other in the first and second generations. In the overwintered generation, however, the catches with pheromone traps preceded those with the light traps, because the light trap was less effective than the sex pheromone trap in the early cool season. Among the annual records of total catches with sex pheromone and light traps, a high positive correlation was obtained for the overwintered generations (r²=0.977), though no significant correlation was found for the first and second generations.