Polylectic. Müller & Kuhlmann (2008) list the following pollen sources: Salicaceae, Apiaceae, Rosaceae, Brassicaceae and Tamaricaceae. based on 17pollen samples from 9 different localities.
The early flying C. caskanus is known to be a pollinator of Malus domestica (Rosaceae) and other fruits (Özbek 1978, 1997, Özbek and Çalmaşur 2001) but it also visits Salix sp.(Salicaceae).