Any plant or substance that repels or kills flies, especially a plant of the genus Erigeron.
From 'fly' + 'bane' (Old English 'bana' meaning 'killer' or 'poison'). Folk remedy names dating back centuries for plants that deter insects.
Before bug spray was invented, people grew 'flybane' in their homes and gardens—it's literally a plant whose job is to wage chemical warfare against flies.
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