Dutch Elm Disease DED
Dutch Elm Disease DED
Management Symptoms and Treatment for DED

Dutch Elm Disease DED - Symptoms Treatment and Management

Dutch Elm Disease or DED for short, is a catastrophic disease of native UK elm trees. It is caused by a fungal pathogen known as Ophiostoma novo-ulmi. It is a disease which attacks vascular canals within a tree, preventing water transport and nutrients from reaching the trunk and canopy.

Below is a Elm Tree Disease video from Auburn University School of Forestry & Wildlife Science

The branches and trunk eventually wilt and die. The fungus is spread by elm bark beetles and the damage becomes apparent in summer and early autumn. DED killed more than 99% of the UK stock of elm trees, leaving tiny isolated populations, notably in Sussex and the Isle of Man amongst other places.

The disease has now re-established itself, putting the remaining UK native elm trees at severe risk.

Dutch Elm Disease - Symptoms

  • Leaves turn yellow, wilt, shrivel and die
  • Bark peels off infected branches
  • Brown streaks can be seen underneath this bark

When the disease first struck, fungicides were developed which gave the trees some protection. However, this needed to be injected into the trunk annually and was abandoned as impractical - the UK tree population at the time was around 30 million trees. Now, there are only a handful left.

How We Can Help

We can positively identify Dutch Elm Disease and recommend treatment and any necessary work to keep the trees healthy. Fungicidal treatment of individual trees can be used to prevent the spread of the disease. Dead branches and dead trees will need to be removed and disposed of in a bio secure way to prevent the disease from spreading to neighbouring trees.

Download the Elm Tree Disease Identification Guide produced by the Forestry Commission.

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