Response of the male bagworm moth (Metisa plana Walker, Lepidoptera: Psychidae) towards female bagworm pheromone lure in wind tunnel bioassays
A study on the response of winged adult males of the bagworm moth Metisa plana towards sex pheromones of the sessile female bagworms was conducted using a dual choice olfactometer and a wind tunnel, between January 2009 and December 2010. Dual choice bioassays showed that male moths significantly frequently (Chi-square; p < 0.001) approached pheromone lures made from case of calling female (CCF) and also from calling female (CF), within a time period of 2.7 min. In the wind tunnel, male moths were tested against 0.1, 0.2 ,0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 5.0, 8.0 and 10 female equivalents (FE) of extracts of CCF, CF, adult female (AF), case adult female (CAF), adult male (AM) and a control, from a distance of 100 cm. Males flew in an 8-shaped pattern then landed on the pheromone spot. The activation threshold for male moths was 0.4FE for CCF and CF in the presence of wind at a distance of 100 cm. The optimal positive response of males toward both CCF and CF was shown at a concentration of 0.8FE. For groups of 10 males tested at the same time, the activation threshold was also at 0.4 FE for CCF under the same conditions. The results on the activation threshold and optimal responses of males towards the sex pheromone are important for the formulation of synthetic pheromone for integrated pest management of the bagworm.
Key words: Metisa plana, bagworm moth, Psychidae, Lepidoptera, pheromone, case of calling female, activation threshold, behavior, African oil palm, Elaeis guineensis, wind tunnel bioassay
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