A polylectic species reported to forage for pollen from flowers belonging to 15 plant families. Females of the spring generation exploited a wide spectrum of pollen hosts, among which Asteraceae, Rosaceae and Salix (Salicaceae) pwere dominant; representing 70.9% of the total pollen grain volume.
In marked contrast, females of the summer generation exhibited a strong preference for the pollen of Campanulaceae, which contributed 79.9% to the total pollen grain volume and was recorded in 24 out of 28 scopal loads (Fig. 12). Field observations revealed that flowers of both Campanula and Phyteuma serve as pollen hosts (Campanulaceae).
A full list of pollen foraging for the species is as follows (Praz et al., 2019):
Spring brood visits Asteraceae (Cichoroidea, Asteroidea); Potentilla-type, Geum (Rosaceae); Salix (Salicaceae); Brassicaceae; Ranunculaceae; Geranium (Geraniaceae); Euphrasia-type (Orobanchaceae); Crocus (Iridaceae); Caryophyllaceae; Acer (Aceraceae); Campanulaceae; Ericaceae.
The summer brood forages at: Campanulaceae; Geranium (Geraniaceae); Caryophyllaceae; Brassicaceae; Colchicum (Colchicaceae); Helianthemum (Cistaceae); Asteraceae (Cichoroidea); Ranunculaceae; Plantago (Plantaginaceae)