A laboratory study was conducted to determine the effect of plant extracts from Lantana camara and Ricinus communis on the growth of Fusarium oxysporium under laboratory conditions, and the results showed a clear moral effect of plant extracts with increasing concentrations used against the target fungus. The results showed that the plant extracts had a significant effect on increasing the concentrations used against the target fungus. Concentrations of 75% and 100% showed high inhibitory efficacy on colony diameter growth, with efficacy varying according to the chemical composition of the extract and the concentration ratio. The results also indicated that the inhibition rate of fungal colony growth increased with increasing concentration of the plant extract, The Ricinus communis plant treatments showed the highest inhibition rate compared to the Lantana camara plant, and the results indicated no significant differences between the time treatments (one week/ten days). Based on the results obtained, as well as on previous studies, it can be concluded that plant extracts may contain phenolic compounds, alkaloids, glycosides and phenolic glycosides, which are responsible for the fungicidal activity against pathogenic fungi. This activity depends on the plant part used, the type of solvent employed in the extraction process, and the species of fungus tested................ Keywords:................Effect. plant, extracts, castor bean, fungus, Fusarium. laboratory conditions