In-vitro evaluation of medicinal plant extracts against Fusarium yellows of French bean (Phaseolus vulgaris L.) caused by Fusarium oxysporum f. sp. phaseoli

The recent, there has been a significant increase in the incidence of Fusarium yellows in French beans caused by Fusarium oxysporum in the growing areas of Tamil Nadu. The antifungal effects of extracts from six medicinal plants-Aloe vera, Tulasi, Omavalli (Coleus aromaticus), Nochi, Chitharatthai, and Nithyakalyani-were tested at concentrations of 5% and 10% against Fusarium oxysporum f.sp. phaseoli in vitro. Among these plants, the 10% concentration of Omavalli (Coleus aromaticus) showed the highest efficacy in inhibiting the growth of F.o. f.sp. phaseoli, with a maximum reduction in mycelial growth of 58.04% and 70.11% compared to the control. Conversely, Nithyakalyani (Vinca rosea) at 10% concentration was the least effective in suppressing the mycelial growth of Fusarium oxysporum f.sp. phaseoli.