Pest Control

Health Problems

A wide range of pests and diseases can attack trees, and the effects are varied. Some cause only aesthetic damage and do not represent a significant risk to the tree or to people near it. Others are more serious; some have the potential to compromise the safety of the tree and increase the risk of the tree failing, some can cause a slow decline in the health of the tree, some pose a risk to human health, but most cause a combination of problems. It is also possible that the decline in the health of a tree could be caused by environmental factors.

Pests

Seemingly healthy trees should be checked periodically to ensure there are no serious threats of disease. Any pest infestation should be noted and reported quickly so the risk can be assessed and correct control methods can be taken to limit further damage or spread. Of course, not all insects are a risk to trees, many are harmless and provide a natural food source for different species of wildlife, but some can be harmful to the health of the tree and to people living or working nearby. If you have any concerns about the health of your trees you should act quickly and contact Gristwood & Toms for professional advice.

Fungus & Disease

Without the proper training it is almost impossible to know the implications of a fungus seen on a tree or why a tree should suddenly become unhealthy. We can provide expert advice to identify the problem and work with you to find the best solution. Our Consultancy service can assess the extent of decay caused by a fungus, provide you with detailed analysis of the problem and provide recommendations for work, which can be carried out by our highly trained Arborists.

Pest Alert

The Oak Processionary Moth (Thaumetopoea processionea) is a recent introduction to the UK from Central and Southern Europe. It causes problems for the tree by eating all the leaves whilst in its larval stage; repeated infestations over a number of years can result in the death of the tree.

It is also a significant problem for the public as the hairs on the larvae (caterpillar) are toxic and contact with or inhalation of the hairs can cause allergic reactions including skin rashes, sore throats and breathing difficulties.

The hairs can be dispersed by the wind so an allergic reaction can still occur even if there has been no direct contact. The Oak Processionary Moth can become abundant on urban trees and amenity woodlands especially English, Sessile and Turkey Oak as well as Hornbeam, Hazel, Beech, Sweet Chestnut and Birch.

What can be done?

Control measures centre on either chemical treatment or nest removal. Currently, new pest chemical treatments are still being developed, although those used against Brown Tail Moth (Euproctis chrysorrhoea) may be effective and we have used insecticide spray applied in early May when it is most effective against the young larvae.

Nest removal is best carried out in July when the moth is in its pupae stage within the silk nests. The nests are removed and sealed in bags for incineration, and the site of the nest is scourged with a blowtorch to remove any residual hairs. Due to the need to be close to the nests and the large number of toxic hairs they contain this is carried out whilst wearing breathing apparatus, face protection, paper suits and rubber gloves. Nests should still be removed after the moths have emerged as the hairs can still cause irritation for over 12 months. We are looking at more effective ways to collect the nests in order to further reduce the risk to our staff and the public.

Take Action Now

We have worked closely with our client, where the Oak Processionary Moth is prevalent, to develop an effective way to treat and restrict its spread. We have a team on quick response to deal with nests as they are spotted. If you have any concerns that the Oak Processionary Moth might be affecting the trees in your area, then now is the time to act. The earlier they are spotted, the better chance there is of containment. Contact Gristwood & Toms for immediate help and advice.