I have black fly on my Sambuca and a few on the Broad Beans although this doesn't affect the bean pods or the beans themselves. I've given up with spraying, never use chemicals as this n turn affects to the birds and actually, the ants and ladybirds are doing a grand job of eliminating the black fly. Everything has to live and eat somewhere, why interfere with the balance of nature?
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I haven't had them before but I am so determined to try and get rid of them. They have been doing so well too.