Dead or dying English elm sapling. |
What you will see in most hedgerows at least in Southern England will be the sad sight of English elm saplings succumbing to Dutch elm disease and quickly turning their leaves brown and dying. Around them you will very likely see what look like perfectly healthy smaller elm sapling.
When Dutch elm disease first struck in the mid 1970 it altered the English landscape as massive elms that had stood for a century or more along the side of our country lanes and whole woods of elms quickly turned brown and died in August. It looked in places like Autumn had come a full two months early. Many feared that the elm was doomed and frantic efforts were made to conserve a few trees by annual 'injections' of fungicide to kill off the culprits (there are three related ascomycete microfungi which cause the disease).
But the English elm didn't die out completely. Instead it became a hedgerow plant as young saplings sprang up from the roots of the old dead trees. Spreading by root suckers rather than seed is a characteristic of the English Elm. But to understand why they didn't also die off it's necessary to understand the way Dutch elm disease is spread. It doesn't spread by wind-blown spores like many other fungi but depends entirely on being spread by the elm bark beetle. This beetle lays its eggs underneath the bark of the elm by depositing them via an ovipositor into the layer immediately beneath the bark, transferring the fungal spores beneath the bark as it does so.