Ash Dieback in Warwickshire: Signs, Risks & What to Do

What ash dieback is

Ash dieback is a disease caused by a fungus called Hymenoscyphus fraxineus. It was first identified in England in 2012 and has since spread across the country, affecting our native common ash. There is no cure. Government and Tree Council guidance expects the disease to affect the large majority of ash trees in the UK over time, which is why every ash owner should at least know what the early signs look like.

The important nuance most people miss: not every infected ash dies, and not every infected ash needs to come down. A proportion of trees show genuine tolerance to the disease, and current national guidance is to retain healthier trees where it is safe to do so. The decision is always about risk, not panic.

The signs to look for this summer

Walk around your ash and look for these:

• Wilting or blackened leaves at the tips of shoots, often looking scorched
• Patches of the crown thinning or dying back while the rest still holds leaf
• Dark, sunken lesions on the bark, typically diamond shaped, often where a side branch meets the stem
• Dense clumps of new shoots lower down the trunk, which is the tree trying to compensate for a dying crown

One or two of these on their own do not confirm the disease, and drought stress can look similar in a dry summer. That is exactly why an assessment by someone who works with trees daily is worth having before any decisions are made.

Why affected ash trees become genuinely dangerous

This is the part that matters most for safety. As ash dieback progresses, the wood becomes brittle and unpredictable. Affected trees can shed limbs without warning and can fail entirely in the later stages. That brittleness is also why diseased ash is one of the most hazardous trees for anyone to work on: standard climbing techniques stop being safe, and removals often need to be done in carefully planned sections, sometimes with specialist access equipment.

In plain terms: an ash showing significant dieback near your house, driveway, garden or a footpath is not a DIY job and not a job for the cheapest quote from someone without proper training and insurance.

There is a legal side too. As the owner of the land a tree stands on, you have a duty of care for the safety of people and property around it. If an ash in your garden is visibly declining over a pavement or a neighbour’s garden and something happens, “I hadn’t looked at it” is not a defence. A documented assessment protects you as much as it protects the tree.

What actually happens after an assessment

An assessment does not automatically mean felling. Depending on the stage of the disease and what is around the tree, the sensible outcome might be:

• Monitoring, with another look next season, where the tree is healthy enough and away from the house, drive or anywhere people pass
• Deadwood removal or a crown reduction to manage the immediate risk while keeping the tree
• Sectional removal, where the decline is advanced and the tree stands over property, roads or places people use

If a tree does need to come down and it is protected by a Tree Preservation Order or stands in a conservation area, there are notification rules to follow, with specific exemptions for dead and dangerous trees. We deal with this regularly and can point you in the right direction with the local council before any work starts.

Ash in Warwickshire gardens

Ash is one of the most common trees in Warwickshire’s hedgerows, field edges and larger gardens, from Leamington and Warwick out to the villages around Harbury and Southam. Many local ash were self-seeded decades ago and have grown into substantial trees close to houses, which is precisely the combination that needs watching now.

If you have an ash you are unsure about, send us a photo or ask us to take a look. As a local tree surgeon covering Warwickshire, we will give you an honest read on its condition, and if work is needed, from a reduction through to a full sectional removal, we will plan it safely and leave the site clean. Assessments and quotes are free, with no pressure either way.

Frequently Asked Questions

Can an ash tree recover from ash dieback?

There is no cure, but not every infected tree dies. Some ash show natural tolerance and national guidance recommends keeping healthier trees where it is safe to do so. The right call depends on the tree’s condition and what is around it, which is what an assessment establishes.

Is it illegal to cut down an ash tree with dieback?

Usually no permission is needed for a garden tree, but if the tree has a Tree Preservation Order or stands in a conservation area, notification rules apply even when it is diseased, with exemptions for dead and immediately dangerous trees. We can help check this before any work.

Why is removing a diseased ash more involved than a normal removal?

The disease makes the wood brittle and unpredictable, so climbing can become unsafe and the tree often has to be dismantled in planned sections. It is specialist work that should only be done by trained, insured professionals.