Effects of male age and mating status on response to the female sex pheromone of Copitarsia decolora (Lepidoptera: Noctuidae)
Keywords:
Copitarsia decolora, sex pheromone, age, mating, wind tunnel, electroantennographyAbstract
The effects of male age and mating status on the behavioral response of Copitarsia decolora (Guenée) males to the glandular extract of the female sex pheromone were studied by conducting wind tunnel bioassays and electroantennography (EAG). To study the effect of age, 2-3, 4-5, 6-7, 8-9, 10-11 day old males were used to measure attraction in the wind tunnel. To study the effect of age on virgin male antenna depolarization, individual males 3-, 6- and 9-days old were used. The effect of male mating status was studied with 4-6 day old males and subsequent pheromone response was measured after a period of 24 and 48 h. Both male age and mating status significantly affected male response to the female sex pheromone. In the wind tunnel, male attraction to the extract reached its maximum in males 4-7 days old and then decreased as moth age increased. The glandular extract provoked a significantly greater depolarization of the antennae of 6 day old males than in 3 and 9 day old males. In the wind tunnel, virgin males were more attracted to female extracts than mated males. Significantly greater depolarization was observed in the antennae of virgin than mated males.
Resumen
Se estudió el efecto de la edad del macho y el estado de apareamiento sobre la respuesta de comportamiento de machos de Copitarsia decolora (Guenée) al extracto glandular de la feromona sexual de la hembra, mediante bioensayos en túnel de viento y electroantenografía (EAG). Para medir la atracción en túnel de viento se utilizaron machos de 2-3, 4-5, 6-7, 8-9, 10-11 días de edad y para estudiar el efecto de la edad sobre la despolarización de sus antenas, se utilizaron individuos de 3, 6 y 9 días de edad. Para estudiar el efecto del apareamiento se utilizaron machos de 4-6 días de edad y su respuesta a la feromona se midió 24 y 48 horas después. Ambos, la edad del macho y el estado de apareamiento, afectan de manera significativa la respuesta de los machos a la feromona sexual de las hembras. En el túnel de viento, se observó que la atracción de los machos al extracto fue mayor a los 4-7 días y después disminuyó conforme incrementó la edad. El extracto glandular provocó una despolarización significativamente mayor en las antenas de los machos de 6 días de edad que en los machos de 3 y 9 días de edad. En túnel de viento los machos no apareados fueron más atraídos al extracto glandular de las hembras que los machos apareados. Se observó una despolarización significativamente mayor en las antenas de los machos no apareados que en los machos apareados.
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