Rhopalosiphum rufulum Richards, 1960
on Crataegus, primary host plant
parasite
Apterae 2-3 mm, maroon, mottled with green or yellow, with a pattern of mealy wax.
hostplants
Rosaceae, monophagous
notes
Originally a species from Canada; until present found in Europe only once on the primary host.
on Acorus, secondary host plant
parasite
Apterae 1-2 mm, dark brown to blak with dark appendages. On the leaves, sometimes in huge numbers (“the plants looked bespattered with black mud”)
host plants
Acoraceae, monofaag
Acorus calamus.
notes
On the secondary host plant in Europe since about 1970.
references
Blackman & Eastop (2017), Heie (1986a), Şenol, Akyildirim Beğen, Görür & Demi̇rtaş (2014a).