Blackfly (Black Bean Aphid)
Dense colonies of black bean aphid often referred to a blackfly can be found on some vegetables and other plants during spring and summer. There are many other species of aphid that are black.
Scientific name Aphis fabae species group
Plants affected A very wide range including broad, French and runner beans, nasturtium, dahlia, philadelphus, viburnum and euonymus
Main cause A black sap-sucking insect
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.