ARTICLE
TITLE

Influence of gamma-irradiation on flight ability and dispersal of Conopomorpha sinensis (Lepidoptera: Gracillariidae)

SUMMARY

Assessment of quality of male insects has been done primarily in area-wide integrated pest management (AW-IPM) programs that have a sterile insect technique (SIT) component. Routine monitoring of sterile male quality needs to be carried out both in the mass-rearing facility and in the field. Simple bioassays, which can be conducted in the laboratory or under semi-field conditions, would be potential surrogates for laborious field tests that are usually very costly. In the laboratory, a flight mill system was used to assess the quality of males of the litchi stem-end borer, Conopomorpha sinensis (Lepidoptera: Gracillariidae), in terms of flight distance, flight duration and speed. Flight distance, duration, mean speed and greatest speed of non-irradiated adult males were 13,926 m, 29,365 s, 0.42 m/s, and 1.01 m/s, respectively, during a 24 h period. Although the values of these parameters of non-irradiated males were greater than corresponding values for moths irradiated with 150 and 200 Gy, there were no significant differences between the various treatments and the non-irradiated control group. These data suggest that irradiation with 150 and 200 Gy did not significantly affect the flight ability of male litchi stem-end borers. This study also included 2 field release and recapture experiments. The data of the field experiments indicated that recapture rates, dispersal distances, and dispersal directions of the 150 and 200 Gy irradiated males were not significantly different from those of non-irradiated males. These data indicate that the ability of litchi stem-end borer males irradiated with doses of 150 and 200 Gy to disperse in the field was not impaired in comparison with non-irradiated males. ResumenLa evaluación de la calidad de los insectos machos estériles o parcialmente estériles se ha hecho principalmente en relación con programas de manejo de plagas integrado en toda la área (MIP-TA) que tienen un componente de técnica del insecto estéril (TIE). El monitoreo rutinario de la calidad de los machos esteriles necesita ser realizado tanto en las instalaciones de cría masiva como en el campo. Bioensayos simples, que pueden ser realizados en el laboratorio o en condiciones de semi-campo, serían sustitutos potenciales para las pruebas laboriosas de campo para monitorear el desempeño de los machos estériles en el campo que por lo general son costosos. En el laboratorio, se utilizó un sistema de molino de vuelo para evaluar la calidad de machos del barrendador del tallo de litchi (Conopomorpha sinensis; Lepidoptera: Gracillariidae) en términos de distancia, tiempo y velocidad de vuelo. La distancia del vuelo, la duración del vuelo, el promedio de la velocidad y la mayor velocidad de vuelo de los machos adultos no irradiados fueron 13,926 m, 29,365 s, 0.42 m/s, y 1.01 m/s, respectivamente, dentro de un período de 24 h. Aunque los valores de estos parámetros de los machos no irradiados fueron mejores que los de las polillas que habían sido irradiadas con 150 y 200 Gy, no hubo diferencia significativa entre los diferentes tratamientos y el grupo control no tratado. Estos datos sugieren que la irradiación con 150 Gy y 200 Gy no afectó significativamente la capacidad de vuelo de los machos del barrenador del tallo de litchi. Este estudio también incluyó 2 experimentos de liberación de campo y recaptura. Los datos de los experimentos de campo indicaron que la tasa de recaptura, la distancia de dispersión, y la dirección dispersión de las polillas tratadas con 150 Gy y 200 Gy no fueron significativamente diferentes de las de los machos no irradiados. Esto indica que la capacidad de dispersión en el campo de los machos del barrenador del tallo de litchi irradiados con dosis de 150 y 200 Gy no difieren significativamente de los de los machos no irradiados. View this article in BioOne

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