As this is a cleptoparasitic species, all flower visits will be for nectar only.
Flowers visited Jasione montana (Campanulaceae); Senecio jacobaea and Achillea millefolium (Asteraceae).
In Germany, most usually flound nectaring at flowers in the Asteraceae (Westrich, 1989).
Celary (1995) lists the following nectar sources in Poland: Heracleum sphondylium (Apiaceae); Thymus sp. (Lamiaceae); Scabiosa ochroleuca (Dipsacaceae); Jasione montana (Campanulaceae); Achillea millefolium, Leucanthemum vulgare, Solidago virgaurea, Cirsium arvense, Centaurea sp., Leontodon autumnalis, Picris hieracioides, Senecio jacobaea, Crepis sp., Hieracium umbellatum (Asteraceae)
Smit (2004) lists only Jasione montana (Campanulaceae) as a nectar source in the Netherlands