Effect of some fungicides on extracellular enzymes of Sclerotium rolfsii sacc.

The effect of four fungicides on rot of cocoyam tubers, vegetative growth and extracelluar enzymes of the pathogen was investigated. At 200 ppm concentration, rot was completely prevented by Dithane M45. Benomyl and Iprodione in tubers of Xanthosoma sagittifolium. There was better protection by the fungicides for Cocoyam tubers treated with fungicides before spraying with hyphal suspension than those sprayed first with hyphal suspension of Sclerotium rolfsii sacc. At 600 ppm, Benomyl and Iprodione appreciably inhibited mycelial growth of the pathogen by 100% and 80.2% respectively. Both in vitro polygalacturonase and Cx-cellulase of the pathogen were inhibited by the Iprodione and Benomyl unlike Dithane M45 and Cupravit.