CHEMICAL ECOLOGY Monitoring Codling Moth (Lepidoptera: Tortricidae) in Apple with Blends of Ethyl (E, Z)-2,4-Decadienoate and Codlemone

Studies evaluated blends of the pear-derived kairomone ethyl (E, Z)-2,4-decadienoate and codlemone, loaded in gray halobutyl septa, as attractants for adult codlingmoth,Cydia pomonella L. Studies were conducted in apple orchards, Malus domestica Borkhausen, treated with or without sex pheromone dispensers for mating disruption (MD). Septa were loaded with either one or both compounds at rates of 0.0, 0.3, and 3.0 mg pear ester and 0.0 and 3.0 mg codlemone in the Þrst series of tests. Traps baited with a 3.0/3.0-mg blend caught signiÞcantly more males and total number of codling moths than traps baited with either compound alone in both types of orchards. Traps baited with two lures loaded individually with pear ester (3.0 mg) and codlemone (3.0 mg) caught significantly fewer males and total moths than traps baited with the dual lure (3.0/3.0 mg). The addition of 3.0 mg codlemone to pear ester did not signiÞcantly affect the capture of female moths. However, increasing the loading of pear ester from 0.3 to 3.0 mg in the dual lure signiÞcantly increased female moth catch in theuntreatedorchardbut not in the sex pheromoneMDorchard. Increasing the loading of pear ester to 20.0mg in a dual lurewith 3.0mg codlemone signiÞcantly increased total codlingmoth catch comparedwith a 3.0mgcodlemone lure, but female catchwas signiÞcantly lower comparedwith traps baited with a 3.0 mg pear ester lure. Adding a 3.0 mg pear ester lure to traps baited with a 42.0 mg sex pheromone lure signiÞcantly reducedmalemoth catch comparedwith the sex pheromone lure alone but did not reduce the catch of female moths compared with traps baited with a 3.0 mg pear ester lure alone.