Abstract
It was observed that caged adult males of Plautia stali strongly attracted males and females of the same species. In 1982, the number of attracted bugs increased in early summer and in autumn. The percentage of females of all bugs attracted was somewhat higher than that found at their habitats on several kinds of plants. The number of attracted bugs formed a clear peak at dusk or just before complete darkness. Processes of the attraction were discussed in comparison with the southern green stink bug, Nezara uiridula, and the presence of an aggregation pheromone was suggested.
