ANTIFUNGAL POTENTIAL OF PLANT EXTRACTS AND CHEMICALS FOR THE MANAGEMENT OF BLACK SCURF DISEASE OF POTATO

Abstract

Five plant extracts and five chemicals were evaluated against Rhzioctonia solani in lab conditions under completely randomized design (CRD). In plant extracts maximum inhibition against the pathogen expressed by Azadirachta indica (71%) followed by Allium sativum (56%), Eucalyptus camaldulensis (48%), Allium cepa (41%) and Peganum harmala (34%) while in chemicals Moncerene (75.8%) showed significant results followed by Topsin-M (62%), Copper oxychloride (53%), Score (45%) and Shankar (41%) as compared to control. In greenhouse different concentrations of Moncerene and Azadirachta indica alone and their combination were evaluated against the black scurf disease of potato. Combine treatment of Moncerene x A. indica showed highest eyes germination (78%) followed by Moncerene (58%) and Azadirachta indica (62%). Minimum disease incidence % and severity was recorded on combine treatment of Moncerene X Azadirachta indica (8%, 1%) followed by Moncerene (19%, 1.2%) and Azadirachta indica (20%, 1.4%) respectively. Under field conditions same combine treatment of Moncerence X Azadirachta indica showed highest eyes germination (78%) with minimum disease incidence (8%) and severity (1%) as compared to Moncerene (56.6%, 12.4%, 2.4%0) and Azadirachta indica (51%, 12.2%, 2.4%) respectively. Randomized complete block design (RCBD) was applied in field conditions. All experiments were conducted in Research Area of Department of Plant pathology, University of Agriculture, Faisalabad..