Acute Oak Decline
This is a bacterial infection
The disease was believed to be first established in Britain around 30 years ago.
The disease effects mainly English and Sessile Oak
The disease causes tissue decay. Symptoms include vertical weeping fissures which seep black fluid down the trunk. Beneath the weeping fissures a lesion is formed.
It is believed that the Buprestid Beetle (Agrilus biguttatus) is associated with the disease.
After onset of notable symptoms some trees may die within 4-6 years.