New essential aphid prey for Anatis ocellata and Calvia quatuordecimguttata (Coleoptera : Coccinellidae)

Seven aphid species (Eucalipterus tiliae, Tuberculatus annulatus, Euceraphi s betulae, Cavariella konoi, Acyrthosiphon ignotum, A. pisum, Macrosiphonie lla artemisiae) were tested as prey for larvae of Anatis ocellata and all w ere essential prey. Nine aphid species (Chaitophorus tremulae, Cavariella k onoi, Aphis farinosa, Eucalipterus tiliae, Euceraphis betulae, Macrosiphoni ella artemisiae, Acyrthosiphon ignotum, Aphis spiraephaga, Aphis fabae) wer e tested as prey for Calvia quatuordecimguttata. The former six species wer e 'essential' food, while the latter three aphid species were unsuitable fo od for C. quatuordecimguttata. The experiments were conducted under laborat ory conditions with no choice of prey. Some of the checked 'essential' prey apparently do not represent food in the Weld as they occur in other habita ts than the studied coccinellid species that are common on trees.