Ismahane SmaaliKhellef Bouthainasupervisor:Aroua Khaoula2024-07-182024-07-182024633/175-Thttp://dspace.univ-khenchela.dz:4000/handle/123456789/6085Surveys were carried out in apple orchards in communes in the Khenchela wilaya (21), as well as in 52 communes in 52 Algerian wilayas over the period October 2023 to April 2024. Data were collected from the Khenchela Agricultural Services Department (DSA) and the National Plant Protection Institute at Hacen Badi, El-Harrach (wilaya of Algiers). These data showed that forty-three communes out of fifty-two (43/52) in seventeen Algerian wilayas contained an outbreak of C. perniciosa, an infestation percentage of 83%., and that fourteen communes out of twenty-one (14/21) in the wilaya of Khenchela contained outbreaks of C. perniciosa, with a percentage of 67% infestation. It is interesting to note that the our survey revealed 4 new outbreaks in the communes of (Irris, Ichemoul, Tahar, Sidi Maarouf and Kaous) in the wilayas of Batna and Djijel, and 3 new outbreaks in three communes (Baghai, El Hamma (Bazgatou) and El Mahmal) in the wilaya of Khenchela that had not been reported by the DSA. In the wilaya of Khenchela, no work has been done on the actual distribution of C. perniciosafrThesis