Johanna Witzell
Professor
Institutionen för skog och träteknik
Fakulteten för teknik
Film med Johanna Witzell: Hoten mot skogens hälsa
FILM | Vår tids klimatförändringar har gjort att skogsskador kommer öka i framtiden. Skadegörare som svampar och insekter har lättare att få fäste och sprida sig, och det kan medföra att vi förlorar skogar.
Johanna Witzell har alltid varit intresserad av skog och natur. Nu forskar hon om skogens hälsa, och specifikt om vilka de tidiga signalerna är när träd har blivit angripna. Det är viktigt för att hinna upptäcka och stoppa skadegörare i tid.
Mina forskargrupper
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Skogshushållning Inom forskningsområdet Skogshushållning behandlas frågor om hur skogar används och förvaltas på ett hållbart sätt med hänsyn till ekonomiska, sociala och ekologiska aspekter.
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The Bridge Ett unikt partnerskap mellan Södra, IKEA och Linnéuniversitetet som förenar akademi och näringsliv för innovation och hållbarhet, med fokus på skogsbruk och trä.
Mina pågående forskningsprojekt
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Projekt: Den gröna gränsen – peri-urbana skogars potential att mildra klimatförändringar och främja ekosystemtjänster Peri-urbana områden mellan tätbebyggda stadskärnor och rena landsbygdsområden…
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Projekt: Nya verktyg för bevarande av hotade almar genom holobiont Almar (Ulmus spp.) hotas av en aggressiv svampsjukdom, holländsk almsjuka (DED) i hela sitt utbredningsområde. Genom att använda det…
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Projekt: OptiForValue Optimering av skogsbruksåtgärder för hållbart skogsbruk och tillämpningar med högt värde.
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Projekt: Urban Tree Guard – safeguarding European urban trees and forests through improved biosecurity Syftet med projektet är att genom ett internationellt samarbete mellan forskare och andra…
Publikationer
Artikel i tidskrift (Refereegranskat)
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Piispanen, J., Bergmann, U., Karhu, J., Kauppila, T., Witzell, J., et al. (2025). Effect of leaf chemicals from susceptible and resistant alternate hosts of Cronartium on in vitro germination of aeciospores of Cronartium pini and C. ribicola. Baltic Forestry. 31 (1).
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Lopez-Garcia, N., Romeralo, C., Andersen, C.B., Ronnberg, J., Grenville-Briggs, L.J., et al. (2025). Metabarcoding reveals rhizosphere microbiome shifts between healthy and declining Quercus robur trees. Rhizosphere. 34.
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Dorado, F.J., Matsiakh, I., Camison, A., Olaizola, J., Romeralo, C., et al. (2025). Methyl jasmonate spray for the protection of broad-leaf trees against oomycete and fungal pathogens. Journal of Plant Diseases and Protection. 132 (2).
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Piispanen, J., Bergmann, U., Karhu, J., Kauppila, T., Witzell, J., et al. (2025). Temporal and spatial variation in chemical composition of susceptible and resistant alternate hosts of Cronartium pini, Melampyrum sylvaticum and M. pratense. European journal of plant pathology. 173. 89-97.
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Paletto, A., Sergiacomi, C., Marzano, M., Avdibegovic, M., Belka, M., et al. (2025). Collaborative approaches to urban tree biosecurity : Stakeholder's perceptions, actions and social networks. Urban Forestry & Urban Greening. 105.
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Piispanen, J., Bergmann, U., Karhu, J., Kauppila, T., Witzell, J., et al. (2025). Lack of induced chemical changes in leaves of susceptible alternate hosts of Cronartium spp. after inoculation by Cronartium pini and C. ribicola. European journal of plant pathology. 172. 467-474.
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Knapp, D., Sunde, J., Bakhshiganje, M., Witzell, J. (2025). Bacterial Communities Associated With Acute Oak Decline of Sessile Oak (Quercus petraea) in Southern Sweden. Environmental Microbiology Reports. 17 (6).
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Jürisoo, L., Agan, A., Tedersoo, L., Witzell, J., Selikhovkin, A., et al. (2025). Fungal Assemblages in Northern Elms : Impacts of Host Identity and Health, Growth Environment, and Presence of Dutch Elm Disease. Microbial Ecology. 88.
Status: Publicerad -
Puertolas, J., Villar-Salvador, P., Andivia, E., Ahuja, I., Cocozza, C., et al. (2024). Die-hard seedlings. A global meta-analysis on the factors determining the effectiveness of drought hardening on growth and survival of forest plantations. Forest Ecology and Management. 572.
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Piispanen, J., Bergmann, U., Karhu, J., Kauppila, T., Witzell, J., et al. (2024). Diversity and abundance of culturable fungal endophytes in leaves of susceptible and resistant alternate hosts of Cronartium pini and C. ribicola. European journal of plant pathology. 170 (1). 79-89.
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Medina, M., Reyes-Martin, M.P., Levy, L., Lazaro-Gonzalez, A., Andivia, E., et al. (2024). Ex situ germination of European acorns : data from 93 batches of 12 Quercus species. Annals of Forest Science. 81 (1).
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Franic, I., Allan, E., Prospero, S., Adamson, K., Attorre, F., et al. (2023). Climate, host and geography shape insect and fungal communities of trees. Scientific Reports. 13 (1).
Status: Publicerad -
Macaya-Sanz, D., Witzell, J., Collada, C., Gil, L., Martin, J.A. (2023). Core endophytic mycobiome in Ulmus minor and its relation to Dutch elm disease resistance. Frontiers in Plant Science. 14.
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Riit, T., Cleary, M., Adamson, K., Blomquist, M., Burokienė, D., et al. (2023). Oomycete Soil Diversity Associated with Betula and Alnus in Forests and Urban Settings in the Nordic–Baltic Region. Journal of Fungi. 9 (9).
Status: Publicerad -
Youssef, K., Dambrauskaite, M., Witzell, J., Rönnberg, J. (2023). Survey Study Reveals High Prevalence of Heterobasidion Root Rot Infection in Scots Pine (Pinus sylvestris) Stands Established on Seemingly Low-Risk Sites. Forests. 14 (5).
Status: Publicerad -
Witzell, J., Sunnerstam, C., Hansson, T. (2023). Vaccination of Elms against Dutch Elm Disease : Are the Associated Epiphytes and Endophytes Affected?. Journal of Fungi. 9 (3).
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Franic, I., Prospero, S., Adamson, K., Allan, E., Attorre, F., et al. (2022). Worldwide diversity of endophytic fungi and insects associated with dormant tree twigs. Scientific Data. 9 (1).
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Martinez-Arias, C., Witzell, J., Solla, A., Antonio Martin, J., Rodriguez-Calcerrada, J. (2022). Beneficial and pathogenic plant-microbe interactions during flooding stress. Plant, Cell and Environment. 45 (10). 2875-2897.
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Witzell, J., Decker, V.H.G., Agostinelli, M., Romeralo, C., Cleary, M., et al. (2022). Aspen Leaves as a "Chemical Landscape" for Fungal Endophyte Diversity - Effects of Nitrogen Addition. Frontiers in Microbiology. 13.
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Benavent-Celma, C., López-García, N., Ruba, T., Ściślak, M.E., Street-Jones, D., et al. (2022). Current practices and emerging possibilities for reducing the spread of oomycete pathogens in terrestrial and aquatic production systems in the European Union. Fungal Biology Reviews. 40. 19-36.
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Romeralo, C., Martin-Garcia, J., Martinez-Alvarez, P., Jordan Munoz-Adalia, E., Goncalves, D.R., et al. (2022). Pine species determine fungal microbiome composition in a common garden experiment. Fungal ecology. 56.
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Felton, A., Felton, A.M., Wam, H.K., Witzell, J., Wallgren, M., et al. (2022). Forest biodiversity and ecosystem services from spruce-birch mixtures : The potential importance of tree spatial arrangement. Environmental Challenges. 6.
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Agostinelli, M., Nguyen, D., Witzell, J., Cleary, M. (2021). Mycobiome of Fraxinus excelsior With Different Phenotypic Susceptibility to Ash Dieback. Frontiers in Forests and Global Change. 4.
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Pötzelsberger, E., Gossner, M.M., Beenken, L., Gazda, A., Petr, M., et al. (2021). Biotic threats for 23 major non-native tree species in Europe. Scientific Data. 8 (1).
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Cleary, M., Blomquist, M., Marchand, M., Witzell, J. (2021). Oomycetes in rhizosphere soil of ornamental plants from retail nurseries in Southern Sweden. Forest Pathology. 51 (2).
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Agostinelli, M., Cleary, M., Martín, J.A., Albrectsen, B.R., Witzell, J. (2018). Pedunculate Oaks (Quercus robur L.) Differing in Vitality as Reservoirs for Fungal Biodiversity. Frontiers in Microbiology. 9.
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Grenville-Briggs, L.J., Kushwaha, S.K., Cleary, M.R., Witzell, J., Savenkov, E.I., et al. (2017). Draft genome of the oomycete pathogen Phytophthora cactorum strain LV007 isolated from European beech (Fagus sylvatica). Genomics Data. 12. 155-156.
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Gunulf Åberg, A., Witzell, J., Rönnberg, J. (2016). Risk of False Positives during Sampling for Heterobasidion annosum s.l.. Plant Disease. 100 (1). 175-179.
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Blumenstein, K., Macaya-Sanz, D., Martín, J.A., Albrectsen, B.R., Witzell, J. (2015). Phenotype MicroArrays as a complementary tool to next generation sequencing for characterization of tree endophytes. Frontiers in Microbiology. 6.
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Martín, J.A., Witzell, J., Blumenstein, K., Rozpedowska, E., Helander, M., et al. (2013). Resistance to Dutch elm disease reduces presence of xylem endophytic fungi in Elms (Ulmus spp.). PLOS ONE. 8 (2).
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Schiebe, C., Hammerbacher, A., Birgersson, G., Witzell, J., Brodelius, P.E., et al. (2012). Inducibility of chemical defenses in Norway spruce bark is correlated with unsuccessful mass attacks by the spruce bark beetle. Oecologia. 170 (1). 183-198.
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Edenius, L., Mikusiński, G., Witzell, J., Bergh, J. (2012). Effects of repeated fertilization of young Norway spruce on foliar phenolics and arthropods : implications for insectivorous birds’ food resources. Forest Ecology and Management. 277. 38-45.
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Jensen, A.M., Löf, M., Witzell, J. (2012). Effects of competition and indirect facilitation by shrubs on Quercus robur saplings. Plant Ecology. 213 (4). 535-543.
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Farnier, K., Bengtsson, M., Becher, P.G., Witzell, J., Witzgall, P., et al. (2012). Novel bioassay demonstrates attraction of the white potato cyst nematode Globodera pallida (Stone) to non-volatile and volatile host plant cues. Journal of Chemical Ecology. 38 (6). 795-801.
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Witzell, J., Berglund, M., Rönnberg, J. (2011). Does temperature regime govern the establishment of Heterobasidion annosum in Scandinavia?. International journal of biometeorology. 55 (3). 275-284.
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Srivastava, V., Schinkel, H., Witzell, J., Hertzberg, M., Torp, M., et al. (2007). Downregulation of high-isoelectric-point extracellular superoxide dismutase mediates alterations in the metabolism of reactive oxygen species and developmental disturbances in hybrid aspen. The Plant Journal. 49 (1). 135-148.
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Stenberg, J.A., Witzell, J., Ericson, L. (2006). Tall herb herbivory resistance reflects historic exposure to leaf beetles in a boreal archipelago age-gradient. Oecologia. 148 (3). 414-425.
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Strengbom, J., Witzell, J., Nordin, A., Ericson, L. (2005). Do multitrophic interactions override N fertilization effects on Operophtera larvae?. Oecologia. 143 (2). 241-250.
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Nordin, A., Strengbom, J., Witzell, J., Näsholm, T., Ericson, L. (2005). Nitrogen deposition and the biodiversity of boreal forests : implications for the nitrogen critical load.. Ambio. 34 (1). 20-24.
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Witzell, J., Kuusela, T., Sarjala, T. (2005). Polyamine profiles of healthy and parasite-infected Vaccinium Myrtillus plants under nitrogen enrichment. Journal of Chemical Ecology. 31 (3). 561-575.
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Witzell, J., Shevtsova, A. (2004). Nitrogen-induced changes in phenolics of Vaccinium myrtillus : implications for interaction with a parasitic fungus. Journal of Chemical Ecology. 30 (10). 1937-1956.
Status: Publicerad
Konferensbidrag (Refereegranskat)
- Dahy, B., Sengün, E., Witzell, J., Fransson, J. (2025). Mapping Boreal Forest Vitality Using Drone-Based Multispectral Time-Series and Object-Based Classification. International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences ISPRS Archives. 81-86.
- Boman, G., Dahy, B., Sengün, E., Witzell, J., Fransson, J. (2025). Detecting Root Rot Infected Norway Spruce Trees Using Multispectral and LiDAR UAV Data. International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences ISPRS Archives. 33-38.
Kapitel i bok, del av antologi (Refereegranskat)
- Witzell, J., Romeralo Tapia, C., Aldea, J., Löf, M. (2022). Forest diversity and productivity : Implications for forest health in future climates. Forest Microbiology. Vol 2. Forest Tree Health. Academic Press. 49-59.
Artikel, forskningsöversikt (Refereegranskat)
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Woodward, S., Amin, H., Martin-Garcia, J., Solla, A., Diaz-Vazquez, R., et al. (2025). Host-Pathogen Interactions in the Pine-Fusarium circinatum Pathosystem and the Potential for Resistance Deployment in the Field. Forest Pathology. John Wiley & Sons. 55 (2).
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López-García, N., Romeralo, C., Rönnberg, J., Witzell, J. (2024). Control and management of Phytophthora damage in forestry : A systematic mapping study. Forest Pathology. John Wiley & Sons. 54 (4).
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Lankinen, A., Witzell, J., Aleklett, K., Furenhed, S., Green, K.K., et al. (2024). Challenges and opportunities for increasing the use of low-risk plant protection products in sustainable production. A review. Agronomy for Sustainable Development. Springer. 44 (2).
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Felton, A., Petersson, L., Nilsson, O., Witzell, J., Cleary, M., et al. (2020). The tree species matters : Biodiversity and ecosystem service implications of replacing Scots pine production stands with Norway spruce.. Ambio. Springer. 49 (5). 1035-1049.
Status: Publicerad
Kapitel i bok, del av antologi (Övrigt vetenskapligt)
- Witzell, J., Romeralo, C., Martín, J.A. (2021). Translational research on the endophytic microbiome of forest trees. Forest Microbiology, Volume One : Tree Microbiome: Phyllosphere, Endosphere and Rhizosphere. Elsevier. 385-394.
Artikel i tidskrift (Övrigt (populärvetenskap, debatt))
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Normark, E., Witzell, J. (2022). Nya och gamla skogsskötselstrategier och skogsskador. Kungl. Skogs- och lantbruksakademiens tidskrift. 161 (7). 40-43.
Status: Publicerad