| Prevalence of Nosema sp. (Microsporidia: Nosematidae) during an outbreak of the jack pine budworm in Ontario. | |
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MedLine Citation:
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PMID: 21925185 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Microsporidia are believed to play little or no role in outbreaks of the jack pine budworm, Choristoneura pinuspinus Freeman (Lepidoptrera: Tortricidae), because the short duration (2-4years) of those outbreaks may not permit significant build-up of the pathogen. We conducted the first survey of Nosema sp. (Microsporidia: Nosematidae) over the course of a recent jack pine budworm outbreak in Ontario. Between 2004 and 2010 the outbreak defoliated a cumulative total of 1.78 million ha. Microscopic examination of ∼15,000 overwintering larvae collected over 6years in sites with densities of 3 larvae per branch or more revealed widespread occurrence of Nosema at generally high infection intensities. The pathogen was present in 69.5% of the 518 plots that were monitored. Prevalence of infection was generally low (below 40% in 84% of plots with infected larvae) but reached high levels (80-95%) locally and increased rapidly in most infestations within 1-2years of onset. We hypothesize that the habit of early-instar larvae to feed on developing male flowers (pollen cones) after spring emergence is critical in allowing rapid build-up of Nosema by increasing efficiency of horizontal transmission (higher density of both infected larvae and egested spores). Nosema infection may contribute to the complexity of jack pine budworm outbreak patterns by affecting egg recruitment and early-instar survival at the stand level in concert with known effects of budworm-induced reductions in pollen cone production on those processes. |
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Authors:
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Kees van Frankenhuyzen; Krista Ryall; Yuehong Liu; Joe Meating; Paul Bolan; Taylor Scarr |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-8 |
Journal Detail:
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Title: Journal of invertebrate pathology Volume: - ISSN: 1096-0805 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-9-19 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0014067 Medline TA: J Invertebr Pathol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011. Published by Elsevier Inc. |
Affiliation:
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Great Lakes Forestry Centre, Canadian Forest Service, Natural Resources Canada, 1219 Queen Street East, Sault Ste. Marie, Ontario, Canada P6A 2E5. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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