Posted: 25/06/2013 at 20:03
This is something that happens to just about all beech hedges, beyond not looking very nice it does the hedge no harm at all. If you want to do something about it, get the hose out and give it a good hard wash, which will remove a great deal of the whitefly. My beech hedge is near my greenhouse so I have to close that up tight before I wash the hedge, as in the hedge is one thing, but in the greenhouse is quite another.
You can hang those yellow sticky pads in the hedge too if you like, the aphids stick to those and when they are covered you can get rid of them. However, as I said, it does the hedge no harm to speak of, just that sometimes we don't like it.