Aqueous extract of leaves of Azadirachtaindica, Emblicaofficinalis, Pongamiaglabra and Acacia nilotca
were tested in-vitroat 0.2% and 0.5% concentration using poisoned food technique for antimicrobial
activity against mycelial growth of Magnaportheoryzaecausing leaf blast and Bipolarisoryzaecausing
brown spot in rice.
The leaf extracts were found significantly effective in reducing mycelial growth of the
pathogens. The result reveals that A.indica leaf extract @ 0.5% was found most effective in minimizing the
mycelial growth of both the pathogens28.35 mm and 27.12 mm, closely followed by P.glabra leaf extract
29.57 and 30.10 mmin the same concentration, 96 hrs after incubation.