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

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In the rice stem borer moth, Chilo suppressalis WALKER, the influence of the sex pheromone components, Z-11-hexadecenal (Z-11-HDAL) and Z-13-octadecenal (Z-13-ODAL), and their eight structurally related compounds on sexual communication between male and female was studied under field conditions. Relatively good inhibition of male attraction could be achieved with most of the synthetic test compounds except acetates. Among test compounds, Z-11-HDAL, major component of the sex pheromone, and Z-5-hexadecene (Z-5-HD) were most effective as inhibitors on male attraction. These compounds have been shown to cause over 90 percent reduction of males caught in the traps baited with virgin females. In the mating suppression test, all of the four test compounds, sex pheromone components and hydrocarbons, significantly suppressed the mating. Z-11-HDAL and Z-5-HD and a highly suppressive effect on mating. It was also shown that the disruptive effect of Z-11-HDAL on male attraction was appaently higher than Z-5-HD although the release rate of Z-11-HDAL was lower than 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 chemical stability and simplicity in the synthesis. Z-5-HD decreased injury to the plants when it was treated in wide areas.
1980-11-25