Efficacy Ofleaf Extracts In Controlling Leaf Blast And Brown Spotin Rice (Oryza Sativa L.)

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.