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Two congener species of Grapholita molesta and G. dimorpha have similar host ranges and adult occurrence patterns. In addition, the two species commonly use cis-8-dodecenyl acetate (Z8-12:Ac) and trans-8-dodecenyl acetate (E8-12:Ac) as their major se xpheromone components. The commercial lures made of the two components, therefore, suffer a mixed attraction of these two specie s.This study was conducted to assess any effect of their known minor sex pheromone components to reduce the mixed attraction. Whe n cis-8-tetradecenyl acetate (Z8-14:Ac) was added to the commercial sex pheromone consisting of Z8-12:Ac/E8-12:Ac = 85/15, the attraction to G. dimorpha was not affected, but its attraction to G. molesta was significantly reduced. However, the addition of either dodecanyl acetate (12:Ac) or tetradedecanyl acetate (14:Ac) did not influence on the attraction of both species to the commerci al lure.The addition of E8-14:Ac to 3-component sex pheromone, Z8-12:Ac/E8-12:Ac/Z8-14:Ac = 85/15/10, the attraction to G. dimorpha was rather significantly suppressed. From these results, the 3-component sex pheromone, Z8-12:Ac/E8-12:Ac/Z8-14:Ac = 85/15/10was suggested as an improved composition of sex pheromone lure for G. dimorpha.Key words: Grapholita molesta, Grapholita dimorpha, Sex pheromone, Minor component, Cross-attraction, Electroantennogram :   (Grapholita molesta) (G. dimorpha)      .      cis-8-dodecenyl acetate (Z8-12:Ac) trans-8-dodenceyl acetate (E8-12:Ac)   ,            .             .   Z8-12:Ac/E8-12:Ac = 85/15 cis-8-tetradecenyl acetate(Z8-14:Ac)  ,       . Dodecyl acetate (12:Ac) tetradecyl acetate (14:Ac)        .  Z8-12:Ac/E8-12:Ac/Z8-14:Ac = 85/15/10     trans-8-tetradecenyl acetate (E8-14:Ac)  ,     .   Z8-12:Ac/E8-12:Ac/Z8-14:Ac = 85/15/10     .: , , , , , *Corresponding author: hosanna@andong.ac.krReceived October 17 2013; Revised January 9 2014Accepted June 17 2014(Grapholita molesta)    (Hallman, 2004)        ,              (Rothschild and Vicker, 1991; Il'chev et al., 2004; Kovanchi et al., 2004). , , ,         (G. dimorpha )

Enhancement of Species-specific Attraction by Addition of a Minor Component of Sex Pheromone Gland of Grapholita dimorpha