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Natural mating disruption in a protogynous bagworm (Lepidoptera: Psychidae)

1. The occurrence of natural mating disruption is investigated in the bagworm Metisa plana Walker (Lepidoptera: Psychidae). Neotenic females reproduce within a self‐constructed bag made of silk and plant material, and attract males for copulation by discharging pheromone‐impregnated setae into the lower section of their bag (early life pulsed release). Because pheromone release is, in part, out of the female's control, passive pheromone sources emanating from bags of post‐reproductive (dead) females may compete with live pheromone‐calling females.