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Dysaphis bonomii

Parsnip mealy gall aphid

On this page: Identification & Distribution  Biology & Ecology 

Identification & Distribution:

Apterae of Dysaphis bonomii are pale to dull greyish green and are wax-dusted. The dorsal abdomen has complete dark cross bands on many or all of abdominal tergites 1-8. Dysaphis bonomii alate viviparous female (see second image below) also has clearly marked black dorsal bands.

The siphunculi of Dysaphis bonomii are quite long and slender, 4 times or more longer than their basal diameters (see first micrograph below). The cauda is helmet shaped, a little shorter than its basal width in dorsal view (see second micrograph below). The body length of Dysaphis bonomii aptera is 1.2-2.5 mm.

The parsnip mealy gall aphid feeds on the basal parts of wild parsnip (Pastinaca sativa), and is attended by ants. It does not host alternate. Apterous males and oviparae occur in the autumn. Dysaphis bonomii has been found in a few European countries, namely (southern England, Sweden, Germany, Austria and Italy). They are monoecious holocyclic with apterous males.

 

Biology & Ecology:

Wild parsnip (Pastinaca sativa) (see below) is host to over 20 aphid species. The parsnip mealy gall aphid (Dysaphis bonomii) is one of the less common species of aphid found on this plant. We found it at the edge of a salt marsh at Rye Harbour in East Sussex (see our December blog ).

Dysaphis bonomii is distinguished by the complete, dark, cross-bands on many or all of its abdominal tergites and the slender siphunculi. The only references in research papers are a few observations of its occurrence on its host plant, parsnip (Pastinaca sativa).

The pinkish-grey nymphs (pictured above) were clustered at the junction between a lower leaf and the stem.

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).

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