Research and Guidance
The large pine weevil (Hylobius abietis) is the most serious pest of newly planted or naturally regenerating woodland trees on restocking sites in the UK and Ireland. On affected sites, in the absence of protective measures, losses of replanted trees will average around 50%, but in the worst...
Milder and wetter winters, followed by increased spring rainfall, are likely to enhance the survival and infection potential of many tree pathogens. Hotter, drier summers leading to drought stress in trees will also increase their susceptibility to disease and expand the distribution range of some pathogens. The increased incidence and severity of diseases caused by Phytophthora species reduces the benefits that trees provide, including climate change mitigation.
Forest Research have been engaged in efforts to improve tolerance of ash trees to ash dieback caused by Hymenoscyphus fraxineus (previously known as ‘Chalara‘) since the disease was first recognised in Great Britain in 2012.
Progress has been made under three main projects:
Living Ash Project
Ash dieback mass screening trials
Testing a range of ash species for tolerance to ash dieback
Across these three projects,...
Genome sequencing is used to determine the origins and genetic diversity of Dothistroma populations throughout the UK, and confirms the findings of our earlier paper discerning population structure with microsatellite analysis.
Tree Pest Advisory Note A major defoliator of oak in Europe. This document details signs and symptoms of the named tree pest(s) or disease(s) and provides advice on what to do if you suspect the pest or disease is present. Related pages Main oak processionary moth resources page Research and advice on tree pests and […]
In UK forestry, the synthetic pyrethroid insecticides alpha-cypermethrin and cypermethrin have been used for many years to provide protection for young trees planted on restock sites from damage by the large pine weevil, Hylobius abietis L. However, concerns over the toxicity of these insecticides to aquatic life if misused has led to a search for alternative forms of protection. This paper describes a detailed programme of efficacy experiments undertaken between 2009 and 2014 to find replacements for these products. Over 50 combinations of chemical and non-chemical approaches were tested on 16 different sites.
• Novel dendrochronological modelling was developed to explore oak stem growth trends.
• Trees with long-term AOD symptoms may have been predisposed many decades earlier.
• Diseased trees struggle to take advantage of favourable growing conditions.
• Historic episodes of stress may impact the future resilience of oaks to disturbance.
This is a collaboration with tree health scientists to explore new and emerging pest threats to priority tree species and new woodlands. We aim to assess the risks posed by established pests under current and future climates, and the most likely invasion pathways for key invasive pests.
This report reviews and summarises some of the key evidence from around the world on values associated with ash trees, and the management decisions about both ash dieback and emerald ash borer. The evidence on values focuses on historical, social and cultural values while the parts on management decisions looks at actual decisions taken as […]
LAP2 commenced in 2019 as an extention of the earlier Living Ash Project phase I.
The objectives of LAP2 are to:
Establish a National Archive of Tolerant Ash based on selections made in the Living Ash Project phase I and from Forest Research's mass screening trials (Future Trees Trust)
Intensively screen selected trees using...
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