Like lily beetles, the problem with (american) lupin aphid is that it's an introduced species so there are few if any natural predators. The ladybirds and blue tits around here gobble-up greenfly and other native aphids but they completely shun lupin aphid. I've even transferred ladybird lavae onto infected plants but they crawled off of the plants within minutes.
A trowel in the hand is worth a thousand lost under a bush.
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Like lily beetles, the problem with (american) lupin aphid is that it's an introduced species so there are few if any natural predators. The ladybirds and blue tits around here gobble-up greenfly and other native aphids but they completely shun lupin aphid. I've even transferred ladybird lavae onto infected plants but they crawled off of the plants within minutes.