The observation of the cork oak leaves revealing the existence of very numerous and diversified spectacular structures, is called the galls. We studied these in two regions of Northeast of Algeria: the cork oaks of El-Kala and Souk-Ahras. Preliminary results show the presence of four frequent species during two years of study, 2015 and 2016: Dryomyia lichtensteini, Neuroterus saltans, Neuroterus minutulus, and Eriophyes species. We counted up to 40 galls/leaves; the lesions were located mainly in the first and second class of leaves with 1-5 and 6-10 galls/leaves, respectively. The other classes are poorly represented. We also found some specific associations with the same leaf N. minutulus and N. saltans in two study areas rating 46.15% for El-Kala and 87.5% in Souk-Ahras. Other associations exist and vary with the region and year of harvest.