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Cavariella pastinacae

Willow - umbellifer aphid

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

Identification & Distribution:

Adult apterae of Cavariella pastinacae are rather light shiny green with appendages pale except for the base of antennal segment VI and the tarsi which are dark. Their antennae are about 0.45 times the length of the body and the terminal process is 3.0-4.0 times the base of the last antennal segment (cf. Cavariella aegopodi and Cavariella archangelicae where the terminal process is less than 2 times longer than the base of the last antennal segment ). The siphunculi are 2.3-3.0 times as long as the cauda and are slightly swollen towards the tip (cf. Cavariella theobaldi which does not have swollen siphunculi. Warning: this can be difficult to assess in live specimens). The supracaudal process is broadly tongue-shaped, with a flat apex and is 0.5-0.8 times the caudal length. The body length of Cavariella pastinacae apterae is 1.8-2.9 mm.

The Cavariella pastinacae alate has a dark abdominal patch formed by more or less fused cross bands on tergites III-VI. The antennae, cauda, supracaudal process and distal halves of siphunculi are dark.

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

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

The willow - umbellifer aphid host alternates between willows (Salix species) and some umbellifers - mainly hogweed (Heracleum), wild parsnip (Pastinaca) and Angelica. Cavariella pastinacae is common over most of Europe and in North America.

 

Biology & Ecology

Cavariella pastinacae can develop very large colonies - the image below shows part of a colony on hogweed (Heracleum sphondylium).

 

Other aphids on same host:

Primary hosts

For lists of of aphid species on willows (Salix) see our aphids on willow page.

Secondary hosts

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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