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Our field observations indicate that the major host plants are Oryza sativa (rice) for Sogatella furcifera, Echinochloa crus-galli (barnyard grass) for S. panicicola, and Digitaria adscendens for S. longifurcifera. All of these plants gave good growth of insects in the laboratory except that both S. furcifera and S. panicicola showed a high mortality on D. adscendens. The distinct difference in calling sounds of these species suggested sexual isolation one from another. In an oscillograph analysis of sounds a series of male calling sounds consisted of two types, a trill of regular and irregular pulses, and in the case of females a series of simple and regular pulses consisting of several chirps, showing different rates of pulse repetition. No identical or confusingly similar sounds were demonstrated among the species. Interspecific insect crosses were unsuccessful for any combination of the three species.
九州病害虫研究会の論文