Trigonotylus caelestialium Kirkaldy hereafter referred to as T.c. and Stenotus rubrovittatus Matsumura hereafter referred to as S.r. Hemiptera: Miridae are major rice pests that cause pecky rice. Two Japanese companies, Shin-Etsu Chemical Co. Ltd. and Earth Biochemical Co. Ltd., have commercialized synthetic sex pheromones as lures for these two species for monitoring purposes. These lures differ in their chemical composition and the dispenser material used for each species. To elucidate the

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... ferences between the products in their attractiveness to males, we investigated T.c. and S.r. catches using traps baited with the lure products alone or in combination in paddy fields. When the products were used alone, the number of male T.c. catches was not significantly different between the traps baited with the Shin-Etsu product and those baited with the Earth Biochemical product, whereas the number of male S.r. catches in the traps baited with the Earth Biochemical product was significantly lower than that in the traps baited with the Shin-Etsu product. Moreover, with the combined use of either product for T.c. and the Earth Biochemical product for S.r., T.c. catches were significantly lower than in those combined with the Shin-Etsu product for S.r. In conclusion, for S.r., the attractiveness of the Earth Biochemical product was inferior to that of the Shin-Etsu product; furthermore, this product when used in combination with the product for T.c. inhibited the attractiveness for T.c.