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In the rice stem borer moth, Chilo suppressalis Walker, the effect of the sex pheromone components Z-11-HDAL and Z-13-0DAL, and their 12 structurally related compounds on sex pheromone communication between male and female was studied under field conditions. Relatively good dismption of male orientation could be achieved with most of the test compounds except acetates. Among these compounds, Z-11-HDAL and Z-5-HD were most effective as disruptants on male orientation. In the mating suppression test, all the four test compounds, sex pheromone components and hydrocarbons, significantly suppressed the mating and Z-11-HDAL and Z-5-HD in particular had a highly inhibitory effect on mating. It was also shown that the disruptive effect of Z-11-HDAL on male orientation was apparently higher than that of Z-5-HD in comparative field test. Nevertheless, it seems that Z-5-HD is more suitable for practical use than Z-11-HDAL, because of its chemical stability and the simplicity of its synthesis. Z-5-HD decreased the injury of the plants when applied over wide areas. This observation suggests that the mating frequency in the treated areas was decreased by the treatment with this compound. The experiments conducted in the laboratory such as wind tunnel and EAG experiments, also supported the field data. Acknowledgement This investigation has been carried out in collaboration with the following co-workers: M. Hattori and A. Sato of Hokuriku National Agricultural Experiment Station, K. Uchiumi, M. Kurihara, J. Fukami, Y. Fujimoto and T. Tatsuno of the Institute of Physical and Chemical Research. The authors wish to thank Nissan Chemical Co., Ltd. for their help in the synthesis of the compounds, Nittoh Denkoh Co., Ltd. for formulation of the laminated dispensers, Takeda Chemical Co., Ltd. for supplying the traps. References 1) BEEVOR, P.S., HALL, D.R., NESBITT, B.F., DYCK, V.A., ARIDA, G., LIPPOLD, P.C. and OLOUMISADEGHI, H. (1977): Field trials of the synthetic sex pheromones of the striped rice borer, Chilo suppressalis Walker (Lepidoptera: Pyralidae), and of related compounds. Bull. Ent. Res. 67, 439-447. 2) and CAMPION, D.G. (1979): The field use of 'inhibitory' components of lepidopterous sex pheromones and pheromone mimics, in Chemical Ecology: Odour communica3) precursor 158-160. Y., smaller tea tortrix moth 187-192. Fall armyworm: Ent. 3, 778-780. Identification of and inhibitors of the oriental fruit exp. 17. 294-302. (1974): Sex pheromones of Lepidoptera. jJe,cttrzotJ!w>va f'nssvm•Pua in cotton./ Econ Ent. Inhibition of the sexual behaviour of the and its components. I Appl. Ent. Zoo!. 19, J and K!SHINO, K. (1977): Field M. (1975): Suppression of mating of the a component of its sex pheromone. Appl. Ent. Zoot. Discussion Yoshimeki, M. (Japan): Did you consider the possible role of wind velocity and changes in direction in the attraction} effect of the sex pheromone complex? Answer: We changed the locations of the compounds as often as possible so as to minimize the possible error due to factors such as wind and changes in directions. Y oshimeki, M. Comment: I still have some reservations about the validity of such experiments. Dyck, A. V. (International Rice Research Institute, the Philippines): 1) What is the meaning of "percent injured stems"? 2) Did you measure yield differences among the treatments? Answer: 1) The term "percent injured stems" refers to the percentage of rice hills infested with the larvae. 2) Yield differences between the treated and the control areas were not determined.

applied entomology and zoology

Disruption of Sex Pheromone Communication in the Rice Stem Borer Moth, Chilo suppressalis WALKER (Lepidoptera : Pyralidae), with Sex Pheromone Components and Their Analogues