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The observed sex ratio ofPediobius foveolatus [Hym.: Eulophidae] in field populations ofEpilachna varivestis [Col.: Coccinellidae]

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Abstract

Larvae ofEpilachna varivestis Mulsant, parasitized byPediobius foveolatus (Crawford), were collected in soybean fields in Maryland during 1975. AdultP. foveolatus emerging from the larvae were sexed and counted. The ratio of males to females increased as the availability of food within the host decreased. This information is useful in development of exponential models predicting hostparasite interactions.

Résumé

Des larves deEpilachna varivestis Mulsant, parasitées parPediobius foveolatus (Crawford) ont été récoltées en 1975 dans des champs de soja du Maryland. Les adultes deP. foveolatus issus de ces larves ont été dénombrés et les sexes reconnus. Le nombre de mâles par rapport aux femelles augmente lorsque la disponibilité de la nourriture offerte par l'hôte diminue. Ces renseignements sont utiles pour l'établissement de modéles exponentiels destinés à prévoir les interactions hôtes/parasites.

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References

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Authors and Affiliations

  1. Department of Entomology, University of Maryland, 20742, College Park, Maryland, USA

    L. M. Stevens, J. U. McGuire, A. L. Steinhauer & P. A. Zungoli

Authors
  1. L. M. Stevens
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  2. J. U. McGuire
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  3. A. L. Steinhauer
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  4. P. A. Zungoli
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Additional information

Scientific Article No. A2208, Contribution No. 5189 of the Md. Agric. Exp. Sta. This study was supported through U.S.D.A. Cooperative Agreement No. 12-14-1001-41 between the U.S.D.A.-A.R.S. Beneficial Insect Introduction Laboratory and the University of Maryland.

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Stevens, L.M., McGuire, J.U., Steinhauer, A.L. et al. The observed sex ratio ofPediobius foveolatus [Hym.: Eulophidae] in field populations ofEpilachna varivestis [Col.: Coccinellidae] . Entomophaga 22, 175–177 (1977). https://doi.org/10.1007/BF02377840

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  • DOI: https://doi.org/10.1007/BF02377840

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