Sex pheromone of the soybean pod borer, Leguminivora glycinivorella (Lepidoptera: Tortricidae) : Identification and field evaluation

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With reference to the data of synthetic standards, GC-EAD and GC-MS analyses of a pheromone gland extract of the soybean pod borer, Leguminivora glycinivorella (Lepidoptera: Tortricidae), resulted in three acetates [dodecyl acetate, (8E, 10E)-8,10-dodecadienyl acetate (E8, E10-12:OAc), and its (8E, 10Z)-isomer] at a ratio of 10:100:2.5 as a candidate of the pheromone. While the contents in the glands were low and even the titer of the major pheromonal component was ca. 0.5 ng/female, the positions of the two double bonds were confirmed by a mass spectrum of the adduct with 4-methyl-1,2,4-triazoline-3,5-dione. In a soybean field, synthetic E8, E10-12:OAc successfully attracted male moths of L. glycinivorella, and highly selective attraction was observed for E8, E10-12:OAc among the geometrical isomers of the 8,10-diene. Neither of the two minor components showed a synergistic effect on field attraction by E8, E10-12:OAc, and their roles were unclear. A binary lure of E8, E10-12:OAc and (E)-8-dodecenyl acetate (E8-12:OAc) was necessary to attract the male moths of Matsumuraeses falcana, the soybean pod worm, but E8-12:OAc strongly inhibited the attraction of L. glycinivorella by E8, E10-12:OAc, indicating that E8-12:OAc secreted by M. falcana is one of the most important factors in the reproductive isolation of these two species.
2006-08-25