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Erschienen in: BioControl 3/2016

31.10.2015

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

verfasst von: Aurelio Ciancio, Giancarlo Roccuzzo, Cesar Ornat Longaron

Erschienen in: BioControl | Ausgabe 3/2016

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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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Metadaten
Titel
Regulation of the citrus nematode Tylenchulus semipenetrans by a Pasteuria sp. endoparasite in a naturally infested soil
verfasst von
Aurelio Ciancio
Giancarlo Roccuzzo
Cesar Ornat Longaron
Publikationsdatum
31.10.2015
Verlag
Springer Netherlands
Erschienen in
BioControl / Ausgabe 3/2016
Print ISSN: 1386-6141
Elektronische ISSN: 1573-8248
DOI
https://doi.org/10.1007/s10526-015-9704-1

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