Abstract
The functional difference of the two components of sex pheromon of Spodoptera litura, (Z)-9, (E)-11-tetradecadienyl acetate (compound A) and (Z)-9, (E)-12-tetradecadienyl acetate (compound B), in the attraction of flying male moths was analysed in a large field cage. Various dispensors containing compounds A, or B, or a mixture of both were used as lure sources and put in a continuous air stream generated by a fan. The flight courses of released male moths around these lure dispensors were recorded by a video recorder through a TV camera equipped with a night scope. Analysis of flight course traces indicated that the mixing state of compounds A and B in the air is an essential factor in inducing the upwind flight and searching flight of male moths around it. It was also ascertained that the concentration of compound A is an important signal for male moths to locate the pheromone source.
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