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Lupine aphids
Once lupines have been infested with aphids, will they regenerate year after year? I have large lupine plantings too far from water source to spray bugs off and do not wish to use commercial pesticides. This year I will cut all plants back after seeds mature and can be collected. However, are aphids perpetuated through the soil?
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You could try spraying the lupins with a mixture of washing up liquid and water. This makes the plant slippery so the aphids can't cling on.
Thanks, will try