Control of black rot of potato caused by Rhizoctonia bataticola using some plant leaf extracts

Aqeous solutions of Azadirachta indica (neem), Cymbopogon citratus (lemon grass) and Ocimum gratissimum (Sweet Basil) were tested for control of Rhizoctonia bataticola causing black (charcoal) rot in Irish potato (Solamum tuberosum L.). Water and alcohol extracts of the plant leaves were separately evaluated against natural infections of the tubers by the fungus. Alcohol extracts of the plants were more effective against spore germination, mycelial growth and rot development by the rot-causing organism. Extracts of A. indica were the best in controlling the rot incited by the fungus, followed by C. citratus and O. gratissimum. Extracts of these plants can suitably be exploited as a potent fungicide of plant origin in controlling black rot of stored potato tubers caused by R. bataticola. © 2004, Taylor & Francis Group, LLC.