Emerald Ash Borer Agrilus planipennis
This is not yet present in the UK but has had devastating effects in North America and Russia.
What is it? it is a small insect that bores into the tree.
Cause – The insects larvae is what causes the devastating damage, as they burrow through the bark feeding on the tissues. This causes severe damage to vital cells that transport water and nutrients.
Significance – Ash trees have been recorded to die within 2-3 years of infestation.
Signs/Symptoms – Woodpecker activity as they try to eat the larvae, Yellowing and thinning of foliage, D shape 3 mm holes, fissures on the bark 5-10 cm in length.
IMPORTANT please report it – using the Woodland Trust tree alert tool