Plant Parasites of Europe

leafminers, galls and fungi

Pemphigus borealis

Pemphigus borealis Tullgren, 1909

on Populus, primary host plant


red or green globular purse gall at the base of a still green shoot. The gall is so strongly curved that the broad, apical opening almost touches the base. The gall is maximally 2.5 cm large, and often occurs in fused groups of 4-6.

host plants

Salicaceae, monophagous

Populus balsamifera, x berolinensis, laurifolia, nigra, suaveolens.

on Bidens, secondary host plant


aphids at the roots.

host plants

Asteraceae, monophagous

Bidens cernuus, tripartitus.


Bellmann (2012a), Blackman & Eastop (2014), Buga, Zhorov, Leshchinskaya & Stekolshchikov (2016a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Heie (1980a), Kollár (2011a), Lampel & Meier (2003a), Ludwig (1974a), Osiadacz & Halaj (2014a), Osiadacz & Wojciechowski (2008a), Redfern & Shirley (2011a), Tomasi (2014a), Urban (2004a).

Last modified 22.i.2023