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Woolly Aphid (Eriosoma lanigerum, #863)

Not wholly welcome, but one of the apple trees has a minor infestation of these Woolly Aphids (Eriosoma lanigerum). At first I thought it was mildew, but inside the while sticky wool there are lots of dark-coloured aphids. The colony was attended by some Harlequin Ladybirds, so hopefully natural predation can keep the aphid population under control.