American lupin aphids are very difficult to deal with, so much so that I had to give up growing lupins as the only thing which worked was regular spraying with insecticides and that's something I decided to stop using completely several years ago. I might try growing them again next year but they will be removed instantly if lupin aphid makes an appearance.
A trowel in the hand is worth a thousand lost under a bush.
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American lupin aphids are very difficult to deal with, so much so that I had to give up growing lupins as the only thing which worked was regular spraying with insecticides and that's something I decided to stop using completely several years ago.
I might try growing them again next year but they will be removed instantly if lupin aphid makes an appearance.