Most homeowners don’t notice tree pests until the damage is already done. In the UK, several common pests quietly affect garden trees every year, but spotting the signs early can make a real difference to how well trees recover.
At DH Tree Services, our experienced tree surgeons in Surrey, Sussex and Kent have seen first-hand the damage these pests can cause. From routine tree pruning to professional tree surgery, keeping your trees well maintained is one of the best ways to reduce the risk of infestations and protect their long-term health.
1. Oak processionary moth caterpillars
One of the most well-known tree pests in Southern England, these caterpillars love to feed on oak leaves, weakening the tree over time. Active between May and July, large infestations can strip trees of their foliage. They’re covered in thousands of tiny, toxic hairs that can cause skin irritation and breathing problems for people and pets. Because of the health risks, it’s best not to tackle this pest yourself. DH Tree Services can safely inspect affected trees, remove infested branches where appropriate, and help stop the caterpillars from spreading.
2. Aphids (greenfly and blackfly)
Aphids feed on sap, weakening trees and leaving behind sticky honeydew that encourages sooty mould. A single female can produce dozens of offspring, allowing infestations to spread quickly during spring and summer. They’re especially common on ornamental and fruit trees. If caught early, targeted pruning and ongoing tree maintenance can usually remove affected growth and help keep things under control.
3. Horse chestnut leaf miner
An invasive moth larvae which has become a widespread UK pest. They feed on the inside of horse chestnut leaves, creating brown patches that make trees look scorched by midsummer. Several generations can hatch in a single season, gradually weakening the tree over time. Regular, seasonal tree care can limit the damage, and our team can take a look to assess the tree’s condition, advise on appropriate maintenance, and recommend ways to reduce future infestations such as careful leaf clearance.
4. Scale insects
Often mistaken for small bumps on branches, scale insects feed on sap and can cause yellowing leaves, poor growth and premature leaf drop. Their protective waxy coating makes them difficult to control once established, and they can spread to nearby trees and shrubs. If you suspect scale insects, our experts can identify the problem, prune affected branches and recommend the best way to protect your tree.
5. Bark beetles
Bark beetles tunnel beneath the bark, disrupting the flow of water and nutrients through the tree. They usually target trees that are already weakened by drought, disease or storm damage. Look out for tiny holes in the bark and fine sawdust around the base of the trunk. Contact our team to assess the damage, remove affected limbs if necessary and recommend the most suitable treatment to give your tree the best chance of recovery.
Protect your trees from pests
Most tree pests are much easier to manage when they’re caught early. If you’ve noticed unusual leaf damage, dieback or signs of insect activity, DH Tree Services can inspect your trees, identify the cause and recommend the most effective solution before a small issue becomes a much bigger problem. We’re always happy to take a look and advise on the next steps.
Whether you need expert tree surgery, tree pruning or general tree care in Surrey, Sussex and Kent, contact DH Tree Services today to arrange a free, no-obligation quote. Call us now on 07872 615 504.
