Modification of behavioral response in Copitarsia decolora (Lepidoptera: Noctuidae) due to pre-exposure to sex pheromone and host plant volatiles
Keywords:
Moth, glandular extract, attraction, latency, olfactory stimulus,Abstract
Abstract
In this study we assessed the effect of pre-exposure to host sex pheromones and plant volatiles on the response of virgin males and mated females of Copitarsia decolora (Guenée) (Lepidoptera: Noctuidae), by using glandular extracts of virgin females and host volatile extracts in bioassays conducted in a wind tunnel. Four-day-old insects, either virgin males pre-exposed to glandular extracts of the sex pheromone or mated females pre-exposed to host volatiles, were evaluated 2, 24, and 48 h after pre-exposure. In both sexes, pre-exposure and a subsequent attraction response at 2 h resulted in an inhibitory effect on the olfactory response. Recovery in the olfactory response was observed at 24 and 48 h; however, it took males a shorter activation time when compared with control insects. A brief pre-exposure of insects provoked a short-term (2 h) inhibition of the response to the olfactory stimulus. Consequently, as an integral part of strategies for the management of this pest species, the study of the ecological implications of such inhibition should be considered.
Resumen
Se estudió el efecto de la pre-exposición a la feromona sexual y volátiles de hospedero sobre la respuesta de machos vírgenes y hembras apareadas de Copitarsia decolora (Guenée) (Lepidoptera: Noctuidae), utilizando extractos glandulares de hembras vírgenes y extractos de volátiles de hospedero, mediante bioensayos en túnel de viento. Para este estudio, se utilizaron insectos de 4 días de edad, machos vírgenes pre-expuestos a extractos glandulares de feromona sexual y hembras apareadas pre-expuestas a volátiles de hospedero y evaluados 2, 24, y 48 h después. En ambos sexos, la pre-exposición y posterior respuesta de atracción a las 2 h, causo un efecto de inhibición de la respuesta olfatoria. En ambos sexos, se observó la recuperación de la respuesta olfatoria a las 24 y 48 h, sin embargo, los machos se activaron en menor tiempo en comparación con el control. Una breve pre-exposición de los insectos provocó a corto plazo (2 h) una inhibición de la respuesta al estímulo olfativo, en este sentido, el estudio de las implicaciones ecológicas de esta inhibición deben ser consideradas en las estrategias de monitoreo de esta plaga.
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