Polylectic (Westrich, 1989), but species utilized not known.
Rasmont (1988) lists the following forage species: Ononis spinosa, Trifolium pratense, Anthyllis, Lotus corniculatus, Astragalus (Fabaceae); Symphytum, Echium vulgare (Boraginaceae); Rhinanthus alectorolophus (Scrophulariaceae); Ballota nigra, Lamium purpureum, Teucrium scorodonia (Lamiaceae); Helianthus annuus, Carduus nutans, Cirsium, Centaurea jacea, Leontodon autumnalis and Taraxacum (Asteraceae).