Feeding indices and enzymatic activities of Ectomyelois ceratoniae (Zeller) were studied in a growth chamber under controlled conditions (29± 2 C, relative humidity of 70 ± 5% and a photoperiod of 16:8 (L:D) hours) on two commercial Pistachio cultivars (Akbari and Kalequchi) and an artificial diet. Feeding indices of E. ceratoniae larvae differed significantly on three hosts (P< 0.05). The r…