Is an Unprecedented Dothistroma Needle Blight Epidemic Related to Climate Change?

Dothistroma needle blight, caused by the fungus Dothistroma septosporum, is a major pest of pine plantations in the Southern Hemisphere, where both the host and the pathogen have been introduced. In northern temperate forests where the pest and host trees are native, damage levels have historically...

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Bibliographic Details
Published in:Bioscience 2005-09, Vol.55 (9), p.761-769
Main Authors: WOODS, ALEX, COATES, K. DAVID, HAMANN, ANDREAS
Format: Article
Language:English
Subjects:
Attrition (Research Studies)
Biodiversity
Blight
Climate
Climate change
Climatology
Defoliation
Disease Incidence
Dothistroma
Environmental Influences
environmental threshold
environmental thresholds
Epidemics
Epidemiology
Evergreen trees
forest management
Forestry
fungal diseases of plants
Global warming
Medical syringes
Mortality
OVERVIEW ARTICLES
Pathogens
Pests
Pine trees
Plant pathology
Plantations
species diversity
Temperate forests
Weather
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Summary:Dothistroma needle blight, caused by the fungus Dothistroma septosporum, is a major pest of pine plantations in the Southern Hemisphere, where both the host and the pathogen have been introduced. In northern temperate forests where the pest and host trees are native, damage levels have historically been low; however, Dothistroma is currently causing extensive defoliation and mortality in plantations of lodgepole pine in northwestern British Columbia, Canada. The severity of the disease is such that mature lodgepole pine trees in the area are succumbing, which is an unprecedented occurrence. This raises the question of whether climate change might enable the spread of the disease by surpassing an environmental threshold that has previously restricted the pathogen's development in northern temperate regions. Establishing a causal relationship between climate change and local biological trends is usually difficult, but we found a clear mechanistic relationship between an observed climate trend and the host–pathogen interaction. A local increase in summer precipitation, not climate warming, appears to be responsible. We examine whether the recently observed climate change trend exceeds natural fluctuations in the local climate.
ISSN:0006-3568
1525-3244
DOI:10.1641/0006-3568(2005)055[0761:IAUDNB]2.0.CO;2