We believe that differential searching activities of 4th instar larvae and adults of C. By having such approach, and according to the foraging theory (Kindlmann and Dixon, 1993; Hemptinne et al., 2000), it is expected that ladybirds will oviposit in the patches that can support the survival of their offspring. Consequently, by the time aphid colonies reach their peaks, there will be many 4th instar larvae of C. undecimpunctata within the field engaged in intensive search activities contributing by this way for the suppression of prey