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7.02.09 - Phytophthora diseases on forest trees


7th IUFRO International Workshop on the Genetics of Tree-Parasite Interactions in Forestry Understanding forest tree-antagonistic interactions in a changing world

Pontevedra, Galicia, Spain; NEW DATE: 12-17 September 2022!
Units involved: 7.03.11, 2.02.15, 2.02.20, 7.02.05, 7.02.09, IUFRO Task Force on Forests and Biological Invasions.

Managed and natural forests provide essential ecosystem services worldwide. Due to the free of movement of people and goods across biogeographical zones, tree species are increasingly challenged by emergent invasive biotic threats. We can see large range expansions of pests and diseases, as well assudden shiftsto naïve hostspecies. Moreover, climate change is also increasingabiotic tree stresses, which synergistically interact with tree resistance leading to negative effects on tree survival and forest resilience. Although forest tree species are known to harbour high levels of genetic variation, most remain fairly unstudied, particularly in traits related to host tolerance and resistance to biotic and abiotic stressors.To understand such variations, within the framework of the genetics of tree-antagonist interactions, is necessary to forecast the survival and prevalence of forest populations in a changing environment. This knowledge can also be exploited in breeding programs aiming to improve forest health. The scientific community is pushing for an urgent multidisciplinary and coordinated effort to solve these challenges, making use of current and new knowledge, strategies and technologies. Geneticists, evolutionary biologists, ecologists, phytopathologists, entomologists, plant physiologists, breeders and managers are all involved in this challenge. This workshop will provide the ideal forum for updating knowledge, evidences, solutions and failures between scientific, academic and practical approaches. It is also an opportunity to enhance the dialogue of long experienced expertise with the newgenerations of scientists, which will provide creative and new solutions in the near future.



Hot off the press: A framework to evaluate climate effects on forest tree diseases

Hennon, PE, Frankel, SJ, Woods, AJ, et al. A framework to evaluate climate effects on forest tree diseases. Forest Pathology. 2020; 00:e12649. 
A conceptual framework for evaluation of climate effects on tree diseases is presented. Climate can exacerbate tree diseases by favouring pathogen biology, including reproduction and infection processes. Climatic conditions can also cause abiotic disease—direct stress or mortality when trees’ physiological limits are exceeded. When stress is sublethal, weakened trees may subsequently be killed by secondary organisms. To demonstrate climate's involvement in disease, associations between climatic conditions and disease expression provide the primary evidence of atmospheric involvement because experimentation is often impractical for mature trees. This framework tests spatial and temporal relationships of climate and disease at several scales to document climate effects, if any. The presence and absence of the disease can be contrasted with climate data and models at geographic scales: stand, regional and species range. Temporal variation in weather, climate and climate change is examined during onset, development and remission of the disease. Predisposing factors such as site and stand conditions can modify the climate effects of some diseases, especially at finer spatial scales. Spatially explicit climate models that display temperature and precipitation or derivative models such as snow and drought stress provide useful data, and however, information on disease extent at different spatial scales and monitoring through time are often incomplete. The framework can be used to overcome limitations in other disease causality approaches, such as Koch's postulates, and allow for the integration of vegetation, pathogen and environmental data into causality determinations.


9th Meeting of the IUFRO Working Party 7.02.09: Phytophthora in Forests and Natural Ecosystems

La Maddalena, Sardinia, Italy; 17-25 October 2019.

The 2019 International Union of Forest Research Organizations (IUFRO) Working Party 7.02.09 'Phytophthora Diseases of Forest Trees' conference will be held on La Maddalena Island, Italy, from the 17th to the 25th of October 2019, with the overall aim to bring together scientists and experiences from all over the world, contributing to the progress of knowledge on Phytophthora disease as well as improving and sustaining forest health.

Please note that the abstract submission deadline has been extended to 30 April 2019!

Conference homepage:


8th Meeting of the IUFRO Working Party 7.02.09: Book of Abstracts available!

The Book of Abstracts of the Phythophthora conference in Vietnam has been published!



8th Meeting of the IUFRO Working Party 7.02.09: Fellowships available!

Two types of Fellowships are to be awarded for the Working Party Conference in Vietnam in March 2017 - please make sure to apply by 15 September 2016. Details are available at

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