Acute oak decline is a disease that infects oak trees in the UK. It mainly affects mature oak trees of over 50 years old of both Britain's native oak species: the pedunculate oak (Quercus robur) and the sessile oak (Quercus petraea).
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A separate disease, acuteoakdecline, is killing oaks, while chestnut trees have been felled across the country because of infections spread by moths.