“…When the parasitoids are limited for a fixed time to search for hosts, generally a decelerating (type II) functional response curve is displayed (Burnett, 1951;Griffiths, 1969;Allen and Gonzalez, 1975;van Lenteren and Bakker, 1978;Collins et al, 1981;Hertlein and Thorarinsson, 1987). Several factors such as host species, host densities, previous experiences and temperature may affect the type of functional response (Juliano and Williams, 1985;Coll and Ridgway, 1995;Runjie et al, 1996;Messina and Hanks, 1998;Wang and Ferro, 1998;De Clercq et al, 2000;Mohaghegh et al, 2001;Moezipour et al, 2008). It may also depend on the different geographical race of the parasitoid species (van den Bosch et al, 1979), an important aspect of the Iranian population of D. rapae.…”