Inhibitory activity of flowers of Calycopteris floribunda, Humboldtia brunonis and Kydia calycina against fungal pathogens causingrhizome rot of ginger

摘要

The present study was conducted to evaluate antifungal potency of aqueous extract of flowers of Calycopteris floribunda (Roxb.) Poiret (Combretaceae), Kydia calycina Roxb (Malvaceae) and Humboldtia brunonis Wall (Caesalpiniaceae) against Fusarium oxysporum f.sp. zingiberi and Pythium aphanidermatum isolated from rhizome rot specimens of ginger by poisoned food technique. The test fungi were inoculated on potato dextrose agar plates poisoned with aqueous extract of flowers (10%). The flower extracts were found to be inhibitory to test fungi as evidenced by reduction of mycelial growth of test fungi in poisoned plates.Among flowers, C. floribunda has shown higher inhibition of test fungi than other flowers. P. aphanidermatum was inhibited to more extent than F. oxysporum. Further, in vivo studies are required to recommend the flower extracts for controlling rhizome rot pathogens.