Biology, images, analysis, design...
|"It has long been an axiom of mine that the little things are infinitely the most important" |
Marsh marigold aphidOn this page: Identification & Distribution Biology & Ecology Other aphids on the same host
Identification & Distribution:
Apterae of Rhopalosiphoninus calthae are shining brownish black. The siphunculi are black and strongly swollen, and 3.5-4.6 times the length of the cauda. Immatures have wax deposits, especially over their anterior part.
Biology & Ecology:
Large colonies may develop with aphids covering most of the leaves.
We have recorded syrphid larvae predating Rhopalosiphoninus calthae on marsh marigold (see picture below). Ali et al. (2009) found that the syrphid Ischidon scutellaris was an especially efficient predator of aphids on water plants.
Other aphids on same host:
Blackman & Eastop list 9 species of aphid as feeding on marsh marigold (Caltha palustris) worldwide, and provide formal identification keys.
Of those aphid species, Baker (2015) lists 8 as occurring in Britain: Aphis nasturtii, Aulaorthum solani, Macrosiphum euphorbiae, Myzus ascalonicus, Myzus persicae, Rhopalosiphoninus calthae, Rhopalosiphum nymphaeae and Thecabius affinis.