The efficacy of eighteen crude plant extracts to control the growth of four phytopathogens viz. Sclerotium rolfsii, Fusarium oxysporum, Alteraria solani and Phytophthora capsici was evaluated in vitro. Assays proved that two plant extracts Sida rhombifolia and Boerhavia diffusa provided significant inhibition of mycelial growth of the fungi under investigation. While S. rhombifolia leaf extract inhibited the colony growth of S. rolfsii, A. solani and P. capsici upto 94.10%, 75.14% and 55.15% respectively; B. diffusa leaf extract was effective against S. rolfsii and A. solani, inhibiting the colony growth upto 86.82% and 79.13% respectively. Thus, the study demonstrated that both plants have the potential to be used as biocontrol agents to suppress the growth of some phytopathogens.