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TRICHOGRAMMA SPP. (HYMENOPTERA: TRICHOGRAMMATIDAE) AS EGG PARASITOIDS OF SEPEDON FUSCIPENNIS (DIPTERA: SCIOMYZIDAE) AND OTHER AQUATIC DIPTERA

Published online by Cambridge University Press:  31 May 2012

Steven A. Juliano
Steven A. Juliano
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York 14853
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Abstract

At least two species of Trichogramma (Hymenoptera: Trichogrammatidae) parasitize the eggs of Sepedon fuscipennis Loew (Diptera: Sciomyzidae) in freshwater habitats of central New York. Trichogramma julianoi Platner and Oatman parasitizes S. fuscipennis and Elgiva sundewalli Fries (Diptera: Sciomyzidae). Trichogramma sp. near californicum Nagaraja and Nagarkatti parasitizes S. fuscipennis, E. sundewalli, Tetanocera spp. (Diptera: Sciomyzidae), and pyralid moths (Lepidoptera: Pyralidae). T. julianoi was most active in early and late summer. T. sp. near californicum was most active in mid- and late summer. Another undescribed species, similar to Trichogramma semblidis (Aurivillius), occurs in the same habitats but does not parasitize S. fuscipennis. Its primary hosts are Stratiomyidae (Diptera). Mortality of S. fuscipennis eggs due to Trichogramma varied significantly over the summer and reached 43.6% in late July and early August. A list of parasitoids reared from eggs of insects collected in fresh-water habitats is given.

Résumé

Au moins deux espèces de Trichogramma (Hymenoptera : Trichogrammatidae) parasitent les œufs de Sepedon fuscipennis Loew (Diptera : Sciomyzidae) dans des milieux d’eau douce au centre de New-York. Trichogramma julianoi Platner et Oatman parasite S. fuscipennis et Elgiva sundewalli Fries (Diptera : Sciomyzidae). Trichogramma sp. près de californicum Nagaraja et Nagarkatti parasite E. sundwalli, Tetanocera spp. (Diptera : Sciomyzidae), et des pyrales (Lepidoptera : Pyralidae). L’acivité de T. julianoi a été maximale au début et la fin de l’été. L’activité de T. sp. près de californicum a été maximale au milieu et à la fin de l’été. Une autre espèce, non-décrite et semblable à Trichogramma semblidis (Aurivillius), occupe les mêmes habitats mais ne parasite pas S. fuscipennis. Ses hôtes primaires sont des Stratiomyidae (Diptera). La mortalité des œufs de S. fuscipennis due à Trichogramma a varié considérablement au cours de l’été, atteignant un sommet de 43.6% à la fin de juillet et au début d’août. Une liste des parasitoides obtenus à partir d’œufs d’insectes recueillis dans des habitats d’eau douce est présentée.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 4 , April 1981 , pp. 271 - 279
Copyright
Copyright © Entomological Society of Canada 1981

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