Abstract
Seasonal capture in pheromone traps of summer fruit tortrix moth, Adoxophyes orana fasciata Walsingham was investigated in Japanese pear orchards treated with mating disruptor in Chiba. A. orana population showed two peaks at late May and middle July in 2010, despite the existence of mating disruptor. In order to elucidate the cause of A. orana outbreak, the mating disruptor susceptibility of A. orana was examined. The mating rate in mating disruptor untreated plots ranged from 10.3 to 34.5%, while those in the pheromone treated plots were 0%. This result suggested that A. orana population in Chiba is not resistant to pheromone-based mating disruptor.
