The management of the biological control against aphids by parasitoids requires a deep knowledge of the specific diversity of the target insect in the target area, and understanding the interactions between pests and parasitoids within temporal variations. From April 2022 to Ocober 2023, using a checking method, aphids and their parasitoids on fruits orchard multi-speciecs of apple, pear, peach and apricot trees were collected on Ain Zitoun, Oum El Bouaghi, North Algeria. The first objectif is to evaluate the population dynamics of aphids and their Hymenopteran parasitoid. Secondly, an investigation of temporal effect on the degree of trophic specialization. This study reported that the parasitoid Lysiphlebus testaceipes was polyphagous and generalist for the most aphid species on studied trees but it presented a preference to Aphis pomi and Dysaphis plantaginea on apple trees within the optimal season. The parasitoid Diaeretiella rapae can be the specific agent for biological control against Myzus persicae on Peach trees, it representing 100% in 2022 and 56.25% in 2023 of parasitoids. The study showed an important presence of the secondary parasitoid species on apple and peach trees that can affect parasitoid efficiency to control aphids, hyperparasitism rate reaching more than 30% on peach and on apple and varied between 37.33% in 2022 and 1.77% in 2023
