Antifungal activities of organic preparations, botanicals and nonhazardous chemicals against Rhizoctonia solani Kuhn causing sheath blight of rice

摘要

The study was undertaken to evaluate the antifungal potential of selected organic preparations, botanicals and non-hazardous chemicals under in vitro against Rhizoctonia solani Kuhn causing sheath blight in rice. A total of twenty treatments were tested for their efficacy in inhibiting the mycelial growth of R. solani . Among the treatments, six treatments viz., garlic extract (10%), fermented weed ( Setaria barbata ) extract (100%), fermented egg-lemon juice extract (10%), potassium silicate (1%), lime solution (12.5%) and panchagavya (5%) showed cent percent inhibition of R. solani in potato dextrose agar medium. Further, dipping the sclerotia for different time intervals in the most effective six treatments, fermented egg-lemon juice extract (10%), fermented weed extract (100%), lime solution (12.5%) and panchagavya (5%) completely inhibited the mycelial regeneration from sclerotia at 24 h after dipping and garlic extract (10%) could inhibit only 72 hours after dipping and potassium silicate (1%) resulted only in less inhibition (27.28%) even after 72 hours of dip. Thus, the study revealed the possibility of eco-friendly management of rice sheath blight disease using organic preparations or botanicals or non-hazardous chemicals.