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Effect of UV radiation on the uzi-fly, Exorista sorbillans Wiedemann, an endoparasitoid of the silkworm, Bombyx mori L.

Published online by Cambridge University Press:  19 September 2011

Mahbub Hasan ,
M. Sarwar Jahan  and
Ataur Rahman Khan
Mahbub Hasan
Affiliation:
Department of Zoology, Rajshahi University, Rajshahi 6205, Bangladesh
M. Sarwar Jahan
Affiliation:
Department of Zoology, Rajshahi University, Rajshahi 6205, Bangladesh
Ataur Rahman Khan
Affiliation:
Department of Zoology, Rajshahi University, Rajshahi 6205, Bangladesh
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Abstract

In laboratory experiments, pupae of the uzi fly, Exorista sorbillans Wiedemann (Diptera: Tachinidae), an endoparasitoid of the silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) were subjected to UV-irradiation for different durations. Upon adult emergence, irradiated and control flies were crossed in all possible combinations and allowed to parasitise healthy silkworms. Adult emergence, fecundity and longevity of the resulting progeny were recorded. Progeny of irradiated E. sorbillans showed significantly reduced adult emergence, oviposicion period and hatchability. The reduction in fecundity was negatively correlated with the duration of exposure to UV radiation. The longevity of uzi flies of both the sexes was also significantly reduced.

Résumé

Au cours des essais en laboratoire, des pupes de la mouche Exorista sorbillans (Diptera: Tachinidae), un endoparasitoïde du ver à soie, Bombyx mori L. (Lepidoptera: Bombycidae), ont été soumises à une irradiation aux rayons ultra-violets (UV) pour des durées différentes d'exposition. A leur émergence, les adultes des mouches irradiées et ceux du témoin étaient croisés par toutes les combinaisons possibles, puis laissés parasiter les vers à soie bien portants. On a pris note du taux d'émergence des adultes, de la fécondité et de la longévité des descendants issus des croisements. Il a été constaté que les descendants nés des sujets irradiés de E. sorbillans montraient une réduction significative du taux d'émergence des adultes, de la durée de ponte et du taux d'éclosion d'oeufs. La réduction de fécondité était négativement corrélée avec la durée d'irradiation aux rayons ultraviolets. La longévité était aussi significativement réduite chez les deux sexes.

Keywords

UV-irradiationuzi flyExorista sorbillanssilkwormBombyx mori L.endoparasitoidirradiation aux rayons ultra-violetsmoucheExorista sorbillansver à soie Bombyx mori L.endoparasitoïde
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 1 , March 1998 , pp. 87 - 91
Copyright
Copyright © ICIPE 1998

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