BioImages: The Virtual Field-Guide (UK)

Pemphigus spirothecae Passerini, 1860 (Spiral Gall Aphid)

Date:	2 August 2007
OS grid ref:	SU46
Lat/Lon:	51° 20' N, 1° 20' W
Location:	Vice County: Berks, VC22, England
Stage or state:	Alate
Record Summary:	Spiral galls on petioles of Lombardy Poplar
Associated organism:	on live petiole of Populus nigra 'Italica'
Identification Notes:	Petiole spirally swollen with 1 twist (ie single crack opens up when slightly and very gently uncoiled) with thickened surface inside gall. Galls can be unwound: filled with white waxy globules and small grey aphids with dense tuft of wax filaments from end of abdomen, plus a few alates.