CHEMICAL ECOLOGY Seasonal Flight Patterns of Codling Moth (Lepidoptera: Tortricidae) Monitored with Pear Ester and Codlemone-baited Traps in Sex Pheromone-Treated Apple Orchards

Traps baited with ethyl (E, Z)-2, 4-decadienoate (pear ester) or (E, E)-8,10-dodecadienol (codlemone) were used to monitor codling moth, Cydia pomonella L., (Lepidoptera: Tortricidae) in 102 apple,Malus domestica Borkhausen, orchards. All orchards were treated with 500Ð1,000 Isomate-C PLUS dispensers/ha during 2000Ð2002. Traps baitedwith pear ester caught their Þrst moth signiÞcantly later on average than the paired codlemone-baited traps, but timing of peak moth catch during each moth ßight coincided with both types of lures. The timing of Þrst male moth capture in pear esterÐbaited trapswas signiÞcantly earlier than the Þrst femalemoth; and the percentage ofmale moths in the total numbers of moths captured ranged from 55 to 60% over the three seasons. The percentage of female moths caught by pear esterÐbaited traps that were mated exceeded 80% each year. Pear esterÐbaited traps caught similar numbers of moths as codlemone-baited traps during 2000. However, the density of sex pheromone dispensers per hectare was increased in most orchards in 2001Ð2002; and pear ester outperformed codlemone-baited traps in both years.