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Diplodia Tip Blight on Its Way to the North: Drivers of Disease Emergence in Northern Europe

Brodde, Laura and Adamson, Kalev and Julio Camarero, J. and Castano, Carles and Drenkhan, Rein and Lehtijärvi, Asko and Luchi, Nicola and Migliorini, Duccio and Sanchez-Miranda, Angela and Stenlid, Jan and Özdag, Sule and Oliva, Jonàs (2019). Diplodia Tip Blight on Its Way to the North: Drivers of Disease Emergence in Northern Europe. Frontiers in Plant Science. 9 , 1-12
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Abstract

Disease emergence in northern and boreal forests has been mostly due to tree-pathogen encounters lacking a co-evolutionary past. However, outbreaks involving novel interactions of the host or the pathogen with the environment have been less well documented. Following an increase of records in Northern Europe, the first large outbreak of Diplodia sapinea on Pinus sylvastris was discovered in Sweden in 2016. By reconstructing the development of the epidemic, we found that the attacks started approx. 10 years back from several isolated trees in the stand and ended up affecting almost 90% of the trees in 2016. Limited damage was observed in other plantations in the surroundings of the affected stand, pointing to a new introduced pathogen as the cause of the outbreak. Nevertheless, no genetic differences based on SSR markers were found between isolates of the outbreak area and other Swedish isolates predating the outbreak or from other populations in Europe and Asia Minor. On a temporal scale, we saw that warm May and June temperatures were associated with higher damage and low tree growth, while cold and rainy conditions seemed to favor growth and deter disease. At a spatial scale, we saw that spread occurred predominantly in the SW aspect-area of the stand. Within that area and based on tree-ring and isotope (delta C-13) analyses, we saw that disease occurred on trees that over the years had shown a lower water-use efficiency (WUE). Spore traps showed that highly infected trees were those producing the largest amount of inoculum. D. sapinea impaired latewood growth and reduced C reserves in needles and branches. D. sapinea attacks can cause serious economic damage by killing new shoots, disrupting the crown, and affecting the quality of stems. Our results show that D. sapinea has no limitations in becoming a serious pathogen in Northern Europe. Management should focus on reducing inoculum, especially since climate change may bring more favorable conditions for this pathogen. Seedlings for planting should be carefully inspected as D. sapinea may be present in a latent stage in asymptomatic tissues.

Authors/Creators:Brodde, Laura and Adamson, Kalev and Julio Camarero, J. and Castano, Carles and Drenkhan, Rein and Lehtijärvi, Asko and Luchi, Nicola and Migliorini, Duccio and Sanchez-Miranda, Angela and Stenlid, Jan and Özdag, Sule and Oliva, Jonàs
Title:Diplodia Tip Blight on Its Way to the North: Drivers of Disease Emergence in Northern Europe
Series/Journal:Frontiers in Plant Science (1664-462X)
Year of publishing :2019
Volume:9
Page range:1-12
Number of Pages:12
Publisher:Frontiers
ISSN:1664-462X
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research
Keywords:carbon isotopes, dendroecology, water-use efficiency, latewood, earlywood, vascular wilt pathogen
URN:NBN:urn:nbn:se:slu:epsilon-e-5207
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-5207
Additional ID:
Type of IDID
DOI10.3389/fpls.2018.01818
Web of Science (WoS)000455304700001
ID Code:15883
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:05 Feb 2019 09:44
Metadata Last Modified:15 Jul 2020 23:33

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