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Dynamics of Nosema pyrausta in natural populations of the European corn borer, Ostrinia nubilalis: A six-year study

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Abstract

Nosema pyrausta (Paillot) (Microsporida: Nosematidae) is an obligatory intracellular parasite of the European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae). This pathogen is maintained in natural populations of O. nubilalis by both horizontal and vertical transmission. The impact of N. pyrausta on fecundity of adults and survival of larvae has been well documented in laboratory and field research. In an extensive study covering a 6 year period at one site, we described the effect of N. pyrausta within O. nubilalis populations in a continuous corn following corn ecosystem. We documented the presence of the pathogen through all life stages of O. nubilalis (egg, larva, pupa, adult), by collecting throughout the crop season and examining each insect stage in the laboratory for the frequency of infection with N. pyrausta. The percentage of infection with N. pyrausta and magnitude of the O. nubilalis population fluctuated throughout generation 1 and generation 2. Both horizontal and vertical transmission played a role in maintaining N. pyrausta in the population in both generations. There were strong correlations between percentage adults with N. pyrausta and percentage larvae with N. pyrausta, and between percentage eggs with N. pyrausta and percentage larvae with N. pyrausta. There was a weak correlation between percentage adults with N. pyrausta and percentage eggs with N. pyrausta. The percentage of insects infected with N. pyrausta was always lowest in the egg.

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Authors and Affiliations

  1. Genetics Lab., c/o Insectary, USDA-ARS, Corn Insects & Crop Genetics Research Unit, Iowa State University, Ames, IA, 50011, USA

    Leslie C. Lewis, Douglas V. Sumerford, Lori A. Bing & Robert D. Gunnarson

  2. Ankeny Senior High School, Ankeny, IA, 50021, USA

    Lori A. Bing

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  1. Leslie C. Lewis
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  2. Douglas V. Sumerford
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  3. Lori A. Bing
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  4. Robert D. Gunnarson
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Lewis, L.C., Sumerford, D.V., Bing, L.A. et al. Dynamics of Nosema pyrausta in natural populations of the European corn borer, Ostrinia nubilalis: A six-year study. Biocontrol 51, 627–642 (2006). https://doi.org/10.1007/s10526-005-2937-7

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  • DOI: https://doi.org/10.1007/s10526-005-2937-7

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