The relationship between climate and outbreak dynamics of Dothistroma needle blight in northwest British Columbia, Canada.

Welsh, Cedar

doi:10.24124/2007/bpgub486

Cited by 2 publications

(7 citation statements)

References 28 publications

(52 reference statements)

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“…Dothistroma septosporum was first noted in the 1960s on both native and exotic Pinus species in British Columbia (Funk & Parker 1966, Parker & Collis 1966 however recent work using tree ring records has shown an outbreak history of the pathogen from as far back as the early 1800s (Welsh 2007). The teleomorph was identified on foliage from several British Columbia localities in 1964and 1965(Funk and Parker 1966.…”

Section: Problem In Bcmentioning

confidence: 99%

“…Biologically, this is likely because lodgepole pine is naturally found in much higher frequency in this subzone. Studies done by Welsh (2007) who looked at historical outbreaks of the pathogen using tree ring records also suggest that Dothistroma septosporum is a more natural component of the SBS mc2 subzone. More frequent but less intense outbreaks were found throughout time in this subzone compared to the two ICH subzones (Welsh 2007).…”

Section: Genetic Structurementioning

confidence: 99%

“…Studies done by Welsh (2007) who looked at historical outbreaks of the pathogen using tree ring records also suggest that Dothistroma septosporum is a more natural component of the SBS mc2 subzone. More frequent but less intense outbreaks were found throughout time in this subzone compared to the two ICH subzones (Welsh 2007). The highest gene diversity values were found in two of the sites located in the SBS mc2 subzone in natural stands, which could also suggest that these are older populations that maintain endemic levels rather than ephemeral populations.…”

Section: Genetic Structurementioning

confidence: 99%

“…In addition to favourable climate conditions (Woods et al 2005, Welsh 2007) and changing forest structure, there is the possibility that hosts cannot maintain resistance to multiple attacks by the pathogen. Although not proven by data in this study, results in the few trees looked at suggest that trees are host to multiple genetically distinct individuals.…”

Section: Center Of Originmentioning

confidence: 99%

“…A long term existence of the pathogen is suggested by the presence of both mating types in equal proportions, and the pathogen appears to maintain endemic levels on lodgepole pine which is native to the area. In addition Welsh (2007) has shown periodic outbreaks of the disease since the early 1800s in tree ring records. Further studies including globally distributed populations are needed to further address this issue.…”

mentioning

confidence: 99%

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Genetic structure of the foliar pathogen Dothistroma septosporum in northwest British Columbia suggests recombination and high gene flow.

Dale¹

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Section: Problem In Bcmentioning

confidence: 99%

Section: Genetic Structurementioning

confidence: 99%

Section: Genetic Structurementioning

confidence: 99%

Section: Center Of Originmentioning

confidence: 99%

mentioning

confidence: 99%

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Genetic structure of the foliar pathogen Dothistroma septosporum in northwest British Columbia suggests recombination and high gene flow.

Dale¹

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Regional outbreak dynamics of Dothistroma needle blight linked to weather patterns in British Columbia, Canada

2014

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Dothistroma needle blight (DNB) has caused extensive mortality in plantations of lodgepole pine in northwestern British Columbia, Canada, and even mature pine trees in natural forests are succumbing. We examined a number of explanatory models to determine which temperature or precipitation variable is most important in explaining DNB outbreak occurrence. We compared a multicentury tree-ring outbreak reconstruction with mean monthly temperature and total monthly precipitation during the individual and seasonal spring (April, May, June) and summer (July, August, September) months. A trend towards increased August minimum temperatures appears to be an important climate factor contributing to the spread of the disease. Graphical comparisons of total April precipitation reveal that periods of above-average precipitation coincided with periods of outbreak increase. Decreases in August minimum temperature also correspond to decreases in outbreak severity. Even more pronounced was a spike in spring precipitation and its association with the current epidemic. The correspondence of past outbreaks with periods of wet and warm conditions suggests that regional climate trends drive DNB behavior. The extent and severity of the current disease epidemic raises the possibility that the key factors that drive outbreaks have become more frequent, enabling the emergence of DNB as a serious disease.Résumé : La brûlure en bandes rouges des aiguilles a causé beaucoup de mortalité dans les plantations de pin tordu latifolié du nord-ouest de la Colombie-Britannique, au Canada; il y a même des pins matures qui meurent dans les forêts naturelles. Nous avons examiné plusieurs modèles explicatifs pour déterminer quelle variable de température ou de précipitation est la plus importante pour expliquer le déclenchement des épidémies de brûlure. Nous avons comparé une reconstitution dendrochronologique des épidémies sur plusieurs siècles avec la température mensuelle moyenne et la précipitation mensuelle totale durant chaque mois de printemps (avril, mai, juin) et d'été (juillet, août, septembre) et durant chacune de ces saisons. Une tendance à l'augmentation des températures minimum au mois d'août semble être un facteur climatique important qui favorise la propagation de la maladie. Des comparaisons graphiques de la précipitation totale du mois d'avril révèlent que les périodes durant lesquelles la précipitation est supérieure à la moyenne coïncident avec les périodes durant lesquelles il y a une augmentation des épidémies. Les diminutions de la température minimum du mois d'août correspondent aussi à des diminutions de la sévérité des épidémies. L'association entre une augmentation des précipitations printanières et l'épidémie actuelle était encore plus prononcée. La correspondance des épidémies passées avec des périodes caractérisées par des conditions chaudes et humides indique que les tendances du climat régional déterminent le comportement de la brûlure. L'étendue et la sévérité de l'épidémie actuelle de la maladie soulève la possibilité q...

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The relationship between climate and outbreak dynamics of Dothistroma needle blight in northwest British Columbia, Canada.

Cited by 2 publications

References 28 publications

Genetic structure of the foliar pathogen Dothistroma septosporum in northwest British Columbia suggests recombination and high gene flow.

Genetic structure of the foliar pathogen Dothistroma septosporum in northwest British Columbia suggests recombination and high gene flow.

Regional outbreak dynamics of Dothistroma needle blight linked to weather patterns in British Columbia, Canada

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