On Tue, 7 May 2013 Martin Brown wrote:

How annoying. On young shoots of all my fruit trees.
So many jobs to do.

The reason for that is that you have fed the trees with too much
nitrogen and the new growth is too soft lush and attractive to aphids.

I have a pussy willow tree which is thick with greenfly. It has never
been fed and is in the middle of a lawn.

David

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David Rance writing from Caversham, Reading, UK