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Regulation of the citrus nematode Tylenchulus semipenetrans by a Pasteuria sp. endoparasite in a naturally infested soil

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An Erratum to this article was published on 12 January 2017

Abstract

A population of the citrus nematode Tylenchulus semipenetrans Cobb (Tylenchida: Tylenchulidae) associated to a Pasteuria sp. (Bacillales: Bacillaceae) was studied in a naturally infested field. In a first population dynamics study, prevalence never exceed 50 % and showed a density-dependent relationship with the host at 2–3 months time lags, with a spring sharp increase. In a spatial sampling study, both organisms resulted uniformly distributed and matched the observed relationship. In top (10 cm) soil the adult females were lower than in deeper layers, whereas the nematodes with adhering endospores were higher. Anderson and May’s Model G applied showed that 50–400 endospores per cc of soil can sustain stable regulatory cycles. The nematode and bacterium populations were found in the field 12 years later with declining densities, below the calculated threshold needed to maintain the parasite infection. Data confirmed the bacterium potential in nematode regulation and showed that host numbers affect prevalence changes in time.

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Acknowledgments

Research partially funded by MiPAF, PF Lotta biologica, PF Orticoltura and Project BIOMED. The authors thank R. Bonsignore, A. Loffredo and L. C. Rosso for the assistance provided during this study. The Universitat Politecnica de Catalunya and CNR are gratefully acknowledged for short-term mobility grants (CO).

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Authors and Affiliations

  1. Consiglio Nazionale delle Ricerche, Istituto per la Protezione Sostenibile delle Piante, Via Amendola 122/D, 70126, Bari, Italy

    Aurelio Ciancio

  2. Consiglio per la Ricerca in Agricoltura e l’Analisi dell’Economia Agraria, Centro di Ricerca per l’Agrumicoltura e le Colture Mediterranee (CREA-ACM), Corso Savoia 190, 95024, Acireale, CT, Italy

    Giancarlo Roccuzzo

  3. Departament d’Enginyeria Agroalimentària i Biotecnologia, Universitat Politecnica de Catalunya, UPC-BarcelonaTech, Av. del Canal Olímpic s/n, Castelldefels, 08860, Barcelona, Spain

    Cesar Ornat Longaron

Authors
  1. Aurelio Ciancio
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  2. Giancarlo Roccuzzo
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  3. Cesar Ornat Longaron
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Correspondence to Aurelio Ciancio.

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Handling Editor: Francisco Cazorla.

An erratum to this article is available at http://dx.doi.org/10.1007/s10526-017-9786-z.

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Ciancio, A., Roccuzzo, G. & Longaron, C.O. Regulation of the citrus nematode Tylenchulus semipenetrans by a Pasteuria sp. endoparasite in a naturally infested soil. BioControl 61, 337–347 (2016). https://doi.org/10.1007/s10526-015-9704-1

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  • DOI: https://doi.org/10.1007/s10526-015-9704-1

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