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Black fly
I have a viburnum Opulus that's about 12feet tall, but this year it is smothered in aphids. Every stem, flower and leaf is black with them and every plant underneath and close by is also afflicted. I've sprayed the nearby plants but the tree is so big that I can't do much to help it. Every ladybird I see around the garden I transport across to show it where lunch is, but what else can I do?
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