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Vetch aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution:
Megoura viciae are large apple green to dark bluish green aphids. The adult aptera (see first picture below) has a black head and antennae, the latter being longer than the body. The prothorax is black, much narrower than the body which is green and globular. Black crescent-shaped sclerites are present in front of the siphunculi which are black and swollen in the middle, and about the same length as the cauda. The legs and cauda are also black.
The vetch aphid does not host alternate but spends it entire life cycle on leguminous plants, especially vetch, Lathyrus and broad beans. Eggs are laid at the base of vetch or pea plants and hatch in spring. Populations build up and after three generations winged forms are produced which disperse to other plants. Megoura viciae generally move to the seed pods in autumn.
Other aphids on same host:
Megoura viciae has been recorded from 11 Vicia species.
Blackman & Eastop list 30 species of aphid as feeding on vetch (Vicia species) worldwide, and provide formal identification keys. Baker (2015) lists 21 as occurring in Britain: Acyrthosiphon loti, Acyrthosiphon pisum, Aphis aurantii, Aphis craccae, Aphis craccivora, Aphis fabae, Aphis gossypii, Aphis nasturtii, Aphis solanella, Aphis spiraecola, Aulacorthum solani, Brachycaudus helichrysi, Macrosiphum euphorbiae, Megourella tribulis, Megoura viciae, Myzus antirrhinii, Myzus cymbalariae, Myzus ornatus, Myzus persicae, Neomyzus circumflexus and Smynthurodes betae.
Megoura viciae has been recorded from 16 Lathyrus species.
Blackman & Eastop list 25 species of aphid as feeding on peavines or vetchlings, including 'sweet pea' (Lathyrus species) worldwide, and provide formal identification keys. Baker (2015) lists 16 as occurring in Britain: Acyrthosiphon loti, Acyrthosiphon pisum, Aphis craccae, Aphis craccivora, Aphis fabae, Aphis gossypii, Aphis pseudocomosa, Aphis solanella, Aulacorthum solani, Macrosiphum euphorbiae, Megoura viciae, Megourella purpurea, Myzus ornatus, Myzus persicae, Pemphigus populi and Smynthurodes betae.