Almost certainly a polylectic species. The only published flower visit in Germany is to Phyteuma orbiculare (Campanulaceae) (Westrich, 1989).
Ebmer (1971) lists "Thistles" (Asteraceae) and Mentha (Lamiaceae) as forage species.
Mavromoustakis (1948) reports visitation to Polygonum equisetiforme (Polygonaceae) in Cyprus