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Hyperomyzus lactucae

Blackcurrant-sowthistle aphid

On this page: Identification & Distribution Other aphids on the same host

Identification & Distribution:

The adult aptera of Hyperomyzus lactucae (see first picture below) is medium-sized, broadly spindle shaped, and opaque green. The antennae of the aptera are quite long and pale, but the tips of the antennal segments are dark. The terminal process of the last antennal segment is 4.2-6.0 times the length of its base. The secondary rhinaria on antennal segment III of the aptera are clustered towards the base of the segment (cf. Hyperomyzus pallidus where they are more or less evenly distributed along the length of the segment). The siphunculi are pale with somewhat darker tips, 1.65-2.0 times the length of the cauda, and distinctly swollen. They are 4-7 times longer than the maximum width of their swollen part (cf. Hyperomyzus pallidus which has siphunculi 3-5 times longer than the maximum width of their swollen part) . The cauda is pale, shorter than the siphunculi, and finger shaped. The body length of wingless adult Hyperomyzus lactucae is 2.0-3.2 mm.

The alate has a rather broken (fenestrated) central dark patch on the upper surface of the abdomen, shown in the second picture above and the second below.

The clarified slide mounts below are of adult viviparous female Hyperomyzus lactucae: wingless, and winged.

Micrographs of clarified mounts by permission of Roger Blackman, copyright AWP all rights reserved.

The blackcurrant-sowthistle aphid has a sexual stage in its life cycle, and host alternates from blackcurrant (Ribes) to sowthistle (Sonchus). Populations build up on currant in spring causing leaves to curl downward and stunting young growth. Hyperomyzus lactucae migrates to sowthistle in June, disperses between the summer hosts in July and August, and returns to currant plants in autumn. The species is widely distributed in temperate parts of the world.

 

Other aphids on same host:

Primary host

Hyperomyzus lactucae has been recorded from 31 Ribes species (including gooseberry, Ribes uva-crispa).

Blackman & Eastop list 22 species of aphid as feeding on blackcurrant (Ribes nigrum) worldwide, and provide formal identification keys.

Of those aphid species, Baker (2015) lists 14 as occurring in Britain: Aphis fabae, Aphis grossulariae, Aphis schneideri, Aphis triglochinis, Cryptomyzus galeopsidis, Cryptomyzus galeopsidis ssp. citrinus, Cryptomyzus galeopsidis ssp. dickeri, Cryptomyzus ribis, Eriosoma ulmi, Hyperomyzus lactucae, Hyperomyzus pallidus, Hyperomyzus rhinanthi, Nasonovia ribisnigri and Rhopalosiphoninus ribesinus.

Secondary hosts

Hyperomyzus lactucae has been recorded from 13 Sonchus species.

Acknowledgements

Our particular thanks to Roger Blackman for images of his clarified slide mounts.

Whilst we make every effort to ensure that identifications are correct, we cannot absolutely warranty their accuracy. We have mostly made identifications from high resolution photos of living specimens, along with host plant identity. In the great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens. We have used the keys and species accounts of Blackman & Eastop (1994) and Blackman & Eastop (2006) supplemented with Blackman (1974), Stroyan (1977), Stroyan (1984), Blackman & Eastop (1984), Heie (1980-1995), Dixon & Thieme (2007) and Blackman (2010). We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006).

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