Disclaimer: The views and opinions expressed in this article are those of the author and do not necessarily reflect the views of the Arboricultural Association.

Share this story


#ARBatwork #ArbMatters #PledgeLessPlastic & 12 Faces of Arb 1987 storm 2018 3ATC 3ATC UK Open 50th annual AA AA award AA Awards Aboricultural Association Accident accreditation advice AFL aftercare AGM Agrilus Biguttatus aid air quality Alert Alex Kirkley All Party Parliamentary Group on Horticulture amenity Amenity Conference Ancient Tree Forum Annual Awards app APPGHG apprentice apprenticeship Apprenticeships Approved Approved Contractors ARB ARB Approved Contractor ARB Approved Contractors ARB at work ARB Magazine ARB Show arb training ArbAC ArbCamp Arboricultural Association Arboriculture arborists Arbsafe Ash ash dieback Asian Hornet Assessments atf Australia Autumn Review award Awards Barcham Trees Bark Beetle Bartlett Bartlett Tree Experts bats beetle beyond ism Bill Matthews biochar biodiversity biosecurity branch Branches brand Brexit bs5837 bursary business Call for papers Campout Canker stain of plane carbon Cavanagh CCS Cellular Confinement Systems CEnv Ceratocystis Ceratocystis platani chainsaw chalara charity Charles charter Charter for Trees chelsea Chelsea Flower Show Claus Mattheck climate climate change climber climbing Colleges committees competition competiton conference Confor conifers conservation Consultant consultation Contractor Coroner Council Countryside Stewardship Course for beginners cross industry news Crown & Canopy Cryphonectria parasitica Cumbria DART Date for your diary deadwood death defra Design Devon disease document donate dothistroma draft EAC East Anglia ecology Economic Report economy Ecotricity education Electricity England English Elm environment environmental EPF equipment Europe European Arboricultural Council European Wood Pastures exeter Exhibitors Fatal Fatality felling Fellow Fera Field Trip Fine flood flooding Forest Research forestry Forestry Commission forests FSC Fund4Trees funding fundraiser fungal fungi Futurebuild gardening GDPR Geocells Gold Medal Gov.uk government grant grants Green Brexit Green Infrastructure Green Infratructure guidance Guidance Note 2 guides Hazard Tree Health Helliwell Help Henry Kuppen History Honey Brothers Horse Chestnut horticulture horticulturists HortWeek housing HRH HRH Prince Charles HS2 HSE ICF identification industry industry skills Infographic InfraGreen Inspiration Insurance Intermediate Tree Inspection International Urban Forestry Congress Investigating Tree Archaeology Conference Ips typographus Irma irrigation ISA iso i-Tree IUFC Job job opportunity judgement JustGiving Karabiner Kew land-based Landscape Institute Landscape Show landscaping Lantra law Leaf Minor Lectures legal legislation Liability licence London longevity LTOA Magazine maple Mayor of London MBE Melbourne Member Benefit Membership mentor Midlands moth' NASA National Geographic National Tree Safety Group National Tree Week NATO New Year’s Honours News nominations Northern Northumberland notification NTIS NTOA NTOC NTSG oak 'oak Oak Processionary Moth Oak-boring Beetle obituary Observatree occupation opm Padua parks parliament Perennial Pests and Diseases petition photo Phytophthora planning Planning Law planting Plumpton College policy poll Power Preston Twins Prince Charles Prince of Wales processionary prosecution Protect and Survive protected tree protection Qualifications Quotatis ramorum RC Reg Harris Registered Registered Consultant Registered Consultants Rememberance Day renewal Report Rescue research Research grant Resilience response results retrenchment review RFS rhs RHS Chelsea Flower Show Ride for Research Ride4Research rigging Rodney Helliwell rogue tree surgeons RSFS Safety Safety Bulletin Saftey Scotland Scotland Branch Scottish Branch SDG Accord security seminars Share Sheffield Show Sierra Leone Site Guidance skills SocEnv soil soils South East South West SRWP staff statement Stationary Rope statutory STIHL strategy student Student Conference survey Sustainable Soils Alliance Sweet Chestnut sweet chestnut blight T Levels Tatarian maple TDAG technical guide Technical Guides Technical Officers Ted Green tender Thames & Chiltern The Arboricultural Association The Woodland Trust Thinking Arbs Thinking Arbs Day Timbersports Tools top-handled chainsaws,Elcoat, TPBE4 TPO Trading Standards trailblazer training transport Tree Tree Champion Tree Council Tree Fayre Tree Health Tree Inspection tree loss tree management Tree of the year Tree Officer Tree officers Tree Protection tree register tree species Tree Surgeon Tree Surgeons Tree Week Treeconomics tree-felling TreeRadar trees trees' Trees & Society Trees, People and the Built Environment trust' trustee Trustees TrustMark UAG Uitlity UK favourite ukas UKWAS urban urban forest Urban Forestry Urban Tree Cover urban trees Utility Arboriculture Group vacancy VETcert veteran trees video Videos volunteer VTA WAC Wales watering solutions webinars website Western Westonbirt Wharton Witley Women Women in Arb women in arboriculture woodland woodland trust woods World Environment Day Xylella young young arborists Young People’s Breakfast Event zoo

Crown & Canopy Management Official Preview Part 2

Author:  Arboricultural Association
Last Updated:  23/09/2019
Crown & Canopy Management

Crown & Canopy Management Official Preview

Part 2

Natural Function

Monday Afternoon Session Preview

The Afternoon session on Day 1 of Crown & Canopy Management focuses on the natural physiology of trees, shining a light on how trees respond to damage, bracing and the rising number of tree health issues.

To read detailed biographies and abstracts for every speaker, click the link below.

View Monday Speakers


Luke Steer

Tree Physiology for Arborists

Luke Steer is a Fellow of the Arboricultural Association and a Chartered Arboriculturist. Luke has been studying trees and working with them since 1984. In the opening talk of the afternoon session, he’ll guide us through how trees work and how they react when parts are damaged or removed.

“Healthy trees in tune with their environment are ‘balanced’, or more accurately ‘balancing’ organisms with the ability to readjust to ‘expected’ alterations in their environment.

“The ‘balance’ formed by a tree between its different parts will depend to a certain extent on its genetic makeup and the environmental factors it experiences: location and weather. For instance, a tree growing in a dry sandy soil will allocate resources to grow proportionately more roots per unit of foliage than the same species in a moist loam soil. The limiting growth factor: light, water or mineral nutrient(s); will promote the growth of the tree part that obtains that limiting factor from its environment.

“attheck (1994) describes healthy trees as being ‘self optimising mechanical structures’. That means that each tree part is mechanically as strong as it needs to be to withstand ‘normal’ mechanical stresses – no part is excessively over engineered or insufficiently strong enough. Trees achieve this by allocating resources to grow additional tissue where required for function and mechanical strength.”

Dr Duncan Slater

Natural bracing and bark inclusions

In 2016 Dr Duncan Slater presented his initial identification of a strong relationship between bark-included junctions in trees and the presence of natural braces set above them. Dr Slaters work has caused lots of recent discussion in the world of arboriculture, with its fresh and insightful method of interpreting the structures of trees and how they grow. Focusing in particular on bark-included branch junctions, his continued research over the past few years has a relevance for all aspects of our profession.

This new talk will introduce the audience to a fourth type of reaction wood. Currently, three types of reaction wood are recognised to form in woody plants: compression wood, flexure wood and tension wood. Through x-ray analysis and experiment, a fourth reaction wood is identified that is formed in the axil of a branch junction (the centre of the join), which has been named ‘axillary wood’. The assessment of a branch junction, particularly those with a high diameter ratio, needs to concentrate on the extent of axillary wood production, its position and condition.

Incorporating some of Dr Slaters ‘Trees Over Time’ images this new technical update is significant for arborists in all roles.

“The effects of natural bracing are important for those assessing trees, specifying or carrying out tree work, and this research explains why some bark inclusions are persistent in the structures of trees.

“Previous advice to arborists on bark-included junctions has emphasised that those with large bulges associated with them are more prone to failure. In our most recent experiment, we have generated data by modelling to determine if this previous advice was of use in the assessment of bark inclusions. The outcome of this experiment will be shared with the conference, along with several other papers and research projects.”

Ana Pérez-Sierra

Tree Diseases – A Five Year Overview at Forest Research

Since 2013 when she joined Forest Research, Ana has been actively involved in developing early warning systems for the detection of tree pests and diseases in Britain. Over the past five years the Tree Health Diagnostic & Advisory Service at Forest research have been actively working on the early detection of P&D that might be a threat to the health of trees in Britain.

“We developed TreeAlert to facilitate the reporting of P&D in the country and we have a team of pathologists and entomologists investigating the cause of ill-health in trees. The submitted reports have allowed us to gather information on the health of trees and the main issues encountered. It has also allowed us to monitor the spread of recently introduced P&D. An overview will be presented showing the top ten pests and diseases reported along with some of the most interesting cases encountered. These will include the recently detection of quarantine pests and pathogens such as chestnut blight (Cryphonectria parasitica) and pests and pathogens detected for the first time in the UK.”

With Biosecurity now recognised as a central issue across horticulture and landscape sector, and with pests and diseases high on the government agenda, this is not a session to be missed.

Dr Jon Banks

Shining a light on tree health

The finale of the opening day sees Jon Banks guide us through the concept of tree vitality and how it can be related to pest and disease resilience. Jon recently completed his PhD assessing drought and variation in drought tolerance within the Acer genus.

Tree health and vitality influences a wide range of physiological processes including pest/disease susceptibility and water stress resilience. As well as the concept of tree vitality, Dr Banks will explain its relationship to tree establishment and survival within the landscape. A range of options for monitoring tree vitality, including chlorophyll fluorescence and the Arborcheck system will be discussed, using “real life” case studies from diagnostic field work and ongoing research trials. Dr Banks will explain how measuring tree vitality is of benefit to those managing trees. The future potential of this stress detection technology will also be discussed.

View Monday Speakers