Abstract
Virgin females of the white grub beetle, Dasylepida ishigakiensis Niijima et Kinoshita, emit the sex pheromone, 2-butanol. To investigate the relationships between pheromone emission and ovarian development in this beetle, virgin adult females were kept at 18°C for various lengths of time. The sex pheromone released by individual females at first calling was collected at 23°C and the amounts determined. Females started developing visible oocytes at day 44 and emitting sex pheromone at day 50. Almost all females at day 52 or later possessed eggs, indicating that diapause had ended. A high positive correlation was found between the amounts of pheromone emitted and levels of ovarian development. A large variation of pheromone emission was encountered even among individuals of the same age. Females retained the ability to emit sex pheromone as long as they were virgin. These results may provide important information regarding the timing and duration of application of synthetic sex pheromone in an attempt to control this pest through disrupting the male-female communication.
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