I almost lost a new hedge last year with the beech woolly aphid. Eventually
I learned that liquid derris does the trick. The blighters resisted all
sorts of other insecticides I tried, despite my efforts "under" the leaves.
David

"Chris J Dixon" wrote in message
...
I have a fairly large ornamental crab apple tree which is
suffering badly from woolly aphid.

During the winter I sprayed tar oil wash on those bits I could
easily reach, without killing my neighbour's plants.

They are now back again, as vigorous as ever. The tree is
looking rather shabby, and there are lots of cankers.

Is there anything systemic I could try?

If not, I may have to cut it down, to prevent the infestation
spreading to other plants.

Chris
--
Chris J Dixon Nottingham UK


Have dancing shoes, will ceilidh.