Acute Oak Decline
Symptoms of Acute Oak Decline:
Acute Oak Decline causes black weeping patches on stems and trunks
Longitudinal splits in the bark at the site of the bleeds
Lesions tissue underlying the bleed points
There isn’t a specific cause for this disease
About Acute Oak Decline:
AOD is a new disease mainly affecting native oak trees in Britain and considered to have first made a presence in Britain 30‑35 years ago. Affected trees tend to have vertical, weeping fissures that seep black fluid down the trunk. In the live tissue beneath the bleeds a lesion is created. This is a sign of tissue decay. Some trees die 4-6 years after onset of symptoms. Forest Research is involved in studies to investigate the relationship in more detail.