My Stanley Plum leaves have some sort of hairy white fuzz along the vascular tissue on the underside of the leaves, it is much more prominent near the base of the leaves.

Most leaves are affected, however they look healthy. I thought it was some sort of woolly aphid.

However, the distribution is so complete (on every leaf) that I am wondering if it is a natural fuzz secreted by the plum

Any thoughts?

I could post a picture but I am unaware how to do so.

Cheers

Sam