Each spring, river birch trees are visited by two common pests – aphids and the sawfly larva. While both cause river birch trees to lose some leaves, they do not pose any serious threat to the ...

If you notice defoliation in river birch trees, this may be a sign that dusky birch sawflies (Croesus latitarsus) are feeding on the foliage.Examine the leaf edges for these voracious feeders, which ...

Visitors to the arboretum find that it contains more than 1,000 trees, with 171 provenances of birch ... Birches are fairly free from pests, but can be affected by birch sawfly in late summer.

If you have visited areas around the tree-lined towpath which leads from central Belfast to Lisburn recently, you may have noticed some trees are all but bare of their summer leaves. You may also ...