Abstract: A series of field screening experiments were carried out to compare the effiency of different compositions of pheromone in capillary during the second generation of adults of Chilo suppressalis in 2007 in three sites， i.e. Hangzhou， Tonglu and Jiaxing， in Zhejiang province， China. The experiment used the water-pan trap and cylindric trap， and was in a complete randomized block design. The number of male moths trapped was counted daily to compare the trapping effect of different composition and dosage of pheromone constituents. The results showed that the blends coded as CS2007247A and CS2007247B were the most attractive to male moths of Chilo suppressalis. The trapping capability of the lure degraded as a negative power function with the increase of exposure date.

Key words: Chilo suppressalis（Walker）, sexual pheromone, dosage