Thousands of conker trees on streets in Nottinghamshire may have to be cut down if they are found to be infected by a deadly disease.
Experts are monitoring the horse chestnuts for bleeding canker, a disease which has already appeared in trees in parts of the county.
The fungus eats around the bark and can kill the trees, leaving them in a dangerous condition.
Signs of infection include brown leaves and fewer conkers.
It costs about �1,000 to remove and replace each tree.
Dr Trevor Mabbett, a plant pathologist, said he did not think the disease would completely wipe out the species.
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