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Willow - parsnip aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution:
Adult Cavariella theobaldi apterae are green with the tips of the antennae and apices of the legs dark. The antennae are 0.50 times the length of the body and the terminal process is 2.1-3.5 times the base of the last antennal segment. The siphunculi are more than twice as long as the cauda and are cylindrical or tapering from base to the apex; they are not swollen (distinguishes from Cavariella pastinacae which has the siphunculi slightly swollen towards the tip). The supracaudal process is more or less quadrangular and small, about 0.3-0.7 times the length of the cauda. The body length of apterae is 1.8-2.8 mm. The alate has a dark abdominal patch formed by more or less fused cross bands on tergites III-VI. Cavariella theobaldi antennae are dark and the siphunculi are brownish.
The clarified slide mounts below are of adult viviparous female Cavariella theobaldi : wingless, and winged.
The willow - parsnip aphid host alternates between willows (Salix spp.) and some umbellifers mainly wild parsnip (Pastinaca) and hogweed (Heracleum). Cavariella theobaldi is common over most of Europe and in North America.
Other aphids on same host:
For lists of of aphid species on willows (Salix) see our aphids on willow page.