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PARASITOID NICHES OF ENCARSIA FORMOSA AND ENCARSIA LYCOPERSICI (HYMENOPTERA: APHELINIDAE) EXPLOITING TRIALEURODES VAPORARIORUM (HEMIPTERA: ALEYRODIDAE)

Gabriela Grille, María E. Lorenzo, Juan P. Burla, Jorge Franco and Cesar Basso
The Florida Entomologist
Vol. 95, No. 4 (December, 2012), pp. 1024-1030
Stable URL: http://www.jstor.org/stable/41759152
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
PARASITOID NICHES OF ENCARSIA FORMOSA AND ENCARSIA LYCOPERSICI (HYMENOPTERA: APHELINIDAE) EXPLOITING TRIALEURODES VAPORARIORUM (HEMIPTERA: ALEYRODIDAE)
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Abstract

Encarsia formosa Gahan (Hymenoptera: Aphelinidae) is an aphelinid endoparasitoid of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood) (Hemiptera: Aleyrodidae). Encarsia lycopersici (De Santis) is a parasitoid of the same host, but it is not known if both parasitoids occupy the same niche. In this study, the duration of development of the parasitoids, and the ability of both species to parasitize the 4 preimaginal instars of T. vaporariorum were determined. Results indicate that both E. formosa and E. lycopersici can parasitize all preimaginal instars of T. vaporariorum, and thus effectively occupy the same parasitoid niches, and they are part of the same parasitoid guild. However, variations in parasitism of the different preimaginal instars were observed. Encarsia lycopersici showed a higher parasitism rate on the first instar than on the third and fourth instars of T. vaporariorum. In contrast to E. formosa, which exhibited a lower parasitism rate on the first instar than on the fourth instar. In addition, E. lycopersici showed higher parasitism rate than E. formosa on the first instar of this host. This suggests that E. lycopersici may have a competitive advantage in exploiting the host, as it is the first to occupy it. Encarsia formosa Gahan (Hymenoptera: Aphelinidae) es un afelínido endoparasitoide de la mosca bianca de los invernaderos Trialeurodes vaporariorum (Westwood) (Hemiptera: Aleyrodidae). Encarsia lycopersici (De Santis) es un parasitoide del mismo hospedero, pero no se conoce si ambos parasitoides ocupan el mismo nicho. En este estudio, la duración de desarrollo de los parasitoides y la capacidad de ambas especies de parasitar los cuatro estadios preimaginales de T. vaporariorum fueron determinadas. Los resultados indicaron que E. formosa y E. lycopersici pueden parasitar a T. vaporariorum en todos los estadios preimaginales, ocupan el mismo nicho y son parte del mismo gremio de parasitoides. Sin embargo, se observaron diferencias en la parasitación de los diferentes estadios preimaginales. Encarsia lycopersici mostró mayor parasitismo en el primer estadio que el tercero cuarto estadio de T. vaporariorum, a diferencia de E. formosa, la cual exhibió menor parasitismo en el primer que en el cuarto estadio. Además, E. lycopersici mostró mayor parasitismo que E. formosa en el primer estadio del hospedero. Esto sugiere que E. lycopersici podría tener una ventaja competitiva en explotar el hospedero, porque es el primero en ocuparlo.

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