InfluentialPoints.com
Biology, images, analysis, design...
Aphids Find them How to ID AphidBlog
"It has long been an axiom of mine that the little things are infinitely the most important" (Sherlock Holmes)

 

 

Genus Hyadaphis

Honeysuckle - umbellifer aphids

Species Overview: Genus Hyadaphis   Hyadaphis passerinii 

Genus Hyadaphis [Macrosiphini]

Medium sized elongate-oval aphids. The antennae are shorter than the body. Siphunculi are 0.6 - 1.4 x length of cauda and usually slightly swollen in middle or distal part, with an apical flange. The cauda is dark or pale and is tongue- or finger-shaped, at least 1.4 its basal width in dorsal view.

There are about thirteen described species in this genus. Several species are known to be pests, including Hyadaphis foeniculi (coriander aphid) and Hyadaphis passerinii (honeysuckle aphid). They host alternate from honeysuckle (Caprifoliaceae) species as the primary host to various umbellifers (Apiaceae) as the secondary host. Others complete their entire life cycle on honeysuckle.

N.B. The different appearance in the pictures of the two species below is not a good indication of the species differences. Both species are variable and the difference in appearance may be more because pictures of Hyadaphis foeniculi are on their secondary host, whereas those of Hyadaphis passerinii are on their primary host. For species separation use the dimensions of the prosternal sclerite and the siphunculi/cauda ratio.

 

Hyadaphis foeniculi (Fly honeysuckle aphid, Fennel aphid)

Hyadaphis foeniculi apterae on the primary host are greyish-green or light green with the middle part of the dorsum darker green. Their colour is rather more variable on the secondary host and reddish brown spots are often present at the siphuncular bases. The legs and antennae of Hyadaphis foeniculiare dark. The prosternal sclerite is 1.4 to 2.6 times wider than long. The siphunculi are black and slightly swollen and are 1.05-1.4 times the length of the cauda. The body length is 1.3 to 2.6 mm on the primary hosts, 1.4-2.0 mm on the secondary hosts..

The alate often has 1-4 secondary rhinaria on the fifth antennal segment.

N.B. The characteristics of some Hyadaphis foeniculi populations, we have found, appear to be intermediate between Hyadaphis passerinii and Hyadaphis foeniculi. Hence we cannot be certain about their identification. Some authorities only give Hyadaphis passerinii and Hyadaphis foeniculi subspecific status.

 

Hyadaphis foeniculi host alternates. It mainly uses fly-honeysuckle (Lonicera xylosteum) as its primary host. Infested leaves are curled upwards in spring. Hyadaphis foeniculi migrates to various Apiaceae where it feeds on stems, leaves and flowers. Secondary hosts include hemlock (Conium), fennel (Foeniculum) and Pastinaca. It is widespread in Europe, especially in the north. Hyadaphis foeniculi extends eastwards to Turkey and Iraq and is also found in North America and Brazil.

 

Hyadaphis passerinii (Honeysuckle aphid)

The aptera is elongate and grayish green with a waxy bloom. The antennae and legs are black. The prosternum has a dark, clearly defined trapezoid sclerite which is 2.7-3.6 times wider than long. The siphunculi are black and slightly swollen, 0.85-1.2 the length of the cauda which is black and elongate. The body length of apterae is 1.3-2.3 mm.

Colonies curl the leaves of honeysuckle (Lonicera periclymenum) upwards in spring. Winged forms migrate to their summer hosts - umbellifers (Apiaceae) especially Daucus, Conium and Pastinaca where they colonise the stems., leaves and flowers. The return migration is in autumn. It is found in Europe and the Middle East and parts of Asia. It has also been introduced to southern Africa, Australia and America.

Acknowledgements

We have made provisional 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).

Useful weblinks 

References

  •  Blackman, R.L. & Eastop, V.F. (2006). Aphids on the world's herbaceous plants and shrubs. Vols 1 and 2. John Wiley & Sons.