Unfortunately, trees can get sick and when they are sick, they can become quite dangerous. Stressed and diseased trees become weak and they can collapse suddenly, creating a lot of damage around them and potentially causing a fatality if someone happens to be in the vicinity of the tree at the time. So, in light of this, learning more about identifying a sick tree can be quite useful.


There are many different diseases that attack trees and, on top of that, there are a wide variety of tree species and each of them can be prone to a specific type of disease. Here are some examples:

Ash tree – The disease that commonly occurs in ash tree is called Ash Dieback. Some of the signs of this disease are rapid loss of leaves and decreased density in the crown of the tree. The leaves can turn dark or even black in spring. So far, specialists have not found a successful treatment, but there are some things that we can do to slow down the progress such as removing infected branches and burying or composting them.

Oak trees – Acute oak decline is the most frequent disease in oak trees. One of the first signs of the presence of this disease (that can completely destroy oak trees in five years) is the dark liquid that comes out from the bark. If there is an increase presence of insects this may be another sign of acute oak decline.

Horse chestnut trees – these are affected by different diseases and disorders. One of the most serious ones is called Bleeding Canker. This disease leads to cracking and damage in the bark. A dark substance filled with bacteria will drain from the bark and the tree can die very quickly.

Elm trees – elm trees can be affected by Dutch elm disease which results in rapid change in the colour of leaves – they first turn yellow, then brown. In order to determine whether the tree is infected or not, it is the best to break a twig and see whether there are brown stains inside the wood.

If you have a sick tree in your garden and need professional advice, then please contact us now.