The essential oil (EO) isolated by hydro-distillation from the leaves, stems and flowers of Thymus satureoides, Origanum compactum, Mentha pulegium and Artemisia herba alba from Moroccan plants were analyzed by GC-MS. The major components were respectively borneol (26,45%) and thymol (12,79%) of EO from Thymus satureoides, carvacrol (43,97%) and p-Cymene (17,87%) of EO from Origanum compactum, pulegone (78,07%) of EO from Mentha pulegium and thujone (59,07%) and ?-campholene aldehyde (12,71%) of EO from Artemisia herba alba L. Antifungal activity of these four oils were tested by poisoned food technique against two plant pathogenic fungi viz Bipolaris sorokiniana (Bs) and four Fusarium culmorum's isolates (Fc1, Fc2, Fc3 and Fc4). Minimum inhibitory concentration (MIC), minimum fungi static concentration (MFC) and median inhibitory concentration (IC50) for Isolates tested showed a highly significant variability in their reaction against the action of essential oils tested. Isolate Fc2 was the most resistant to the action of the four essential oils compared to other strains, with IC50 ranging between 0.147 and 4.496mg/mL, MIC from 0.29 to 9.11mg/mL and MFC between 0.57 and 9.11mg/mL. These results suggested that these essential oils could provide natural alternatives against Fc and Bs.