Contribution to the use of synthetic pheromone for forecasting the peach fruit moth, Carposina niponensis Walsingham.
To determine the time at which insecticides should be applied to control the eggs of Carposina niponensis Wlsm. on apple in Hokkaido, Japan, males were caught in traps baited with pheromones, adult emergence from infested fruit was monitored, and the time at which eggs appeared on the fruit was noted. The peak of adult emergence was recorded at about the same time by both the first 2 methods, but in general, the catches in the pheromone traps more accurately reflected the total period during which adults emerged. At one site, adults were recorded as emerging from infested fruits before the first adults were taken in the traps, perhaps indicating that the conditions under which the infested fruits were kept influenced the date of emergence. There was good agreement between the date of oviposition in heavily infested orchards and the catches in the pheromone traps, but the abundance of males in the traps was poorly correlated with the numbers of eggs laid in orchards subjected to rigorous control measures.