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Throwing new light on oak heart-rot

Author:  Royal Forestry Society
  16/06/2020
Last Updated:  16/06/2020
Richard Wright: Embarking on three-year ground-breaking study into oak heart rot

Richard Wright: Embarking on three-year ground-breaking study into oak heart rot.

Research has begun this summer to throw new light into a little understood condition in older oak trees – heart-rot.

Heart-rot is common in oak trees aged 200 years and over and almost universal by the time trees reach 400 years old, but how and why it occurs is a subject which has only just begun to be explored.Now mycologist Richard Wright has started a three and a half year KESS 2* PhD research project under the Action Oak initiative, which is supported by European Social Funds (ESF), supervised by Professor Lynne Boddy at Cardiff University and supported by the Royal Forestry Society (RFS).

Richard says:

“Despite its name, heart-rot can be highly beneficial for some tree species. For oaks it can help them adapt and reach great ages by releasing nutrients for continued growth and adjustments in the trees structure, but heart rot is also at the centre of the richness of the forest ecology. Without it many birds and mammals would not be able to find the holes and conditions to nest, and the complex fungal food chain that supports a huge diversity of insects that so many rely on as a food source would be cut short.

“We do know the common causal agents of heart-rot and their processes, we will be expanding on this knowledge and looking at the interactions, succession, and diversity of these decay communities, in particular the spatial relationships and territories of heart-rot fungi in 3D. To be involved in this sort of pioneering fungal ecology is an aspect of mycology that I find really exciting – looking into the hearts of trees and understanding the essential roles fungi play in forest ecosystems.”

Oak heart-rot is often not visible to the human eye for many decades. Richard’s field work will look at oak trees primarily aged 150 years and over in Wales and he will be collaborating with a colleague carrying out similar research in England. He hopes to be taking samples this summer (subject to Covid-19 restrictions) before beginning analysis, DNA sequencing and developing a 3D model of heart rot progression within a trunk.

Supervisor, Cardiff Biosciences Professor Lynne Boddy says:

“We are delighted to be working with Richard Wright in this important research and to have the support of RFS members. Heart-rot is a natural process and provides habitat for fungi, including the rare oak polypore Buglossoprus quercinus, rare saproxylic invertebrates and some vertebrates. We are hoping not only to understand the interactions that lead to heart-rot, but to understand its progression. Research into beech heart-rot a few years ago revealed fungal decay communities we would never have guessed looking at the fungal fruit bodies on the trunk, and it may well be that we will find a few surprises along the way.”

Chris Jones, Chair of the South Wales Division, says:

“We look forward to introducing Richard to our members in Wales who can support him. They manage woodlands for a range of reasons but many take the greatest pleasure from their older broadleaved woods and research like this that enhances our knowledge of the overall woodland environment is extremely valuable. The research will also provide important evidence on rot in oak that has the potential to be used to inform tree safety management for woodland owners.”

Richard Wright has been delivering educational courses and field studies in mycology for the past ten years and been a researcher at the Royal Botanical Gardens at Kew where he continues to be involved in the Plant and Fungi Tree of Life project.