Oligolectic on Asteraceae; all pollen samples available so far consist of pollen of Carduoideae (A. Müller, unpublished, based on 49 pollen samples from 33 different localities and on field observations).
Banaszak & Romasenko (1989), copied by Stanisavljević, 2000, list the following forage sources: Carduus, Centaurea (Asteraceae); Lamium, Salvia (Lamiaceae); Echium (Boraginaceae). Matache & Ban (2006) cite this information