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Male adults of SPedoptera iitura were reteased at fixed points and captured in a pheremone trap. By comparing the experirnental results with those obtained frorn a simulation model for the male's attraction precess, the active space of the sex pheromone of S. Iitura was estimated. The maximum range dewnwind of thc active space fbr one virgin female was estimated as about 80m for wind velocity of O.50mlsec. This distance decreased with an increase in wind velocity above O.50m!sec, and decreased greatly with decrease in wind velocity below O.50mlsec. The reason for the decreased range at low wind velocities was as a result of a deposition effect of the pheromone. Thus, in a windless greenhouse, the active space was limited to a small area close to the attractant. The active space increased proportionally with an increase in the emission rate of the pheromone, It was revealed that the active space was determined by ene of twe components of litlure (a synthetic sex pheromone of S. Iitura), viz., cis-9, trans-11-tetradecadienyl acetate.

The Active Space of the Spodoptera litura (F.) Sex Pheromone and the Pheromone Component Determining This Space