Author(s): V Prasad, Saurabh Dixit, SKS Rajpoot and DK Dwivedi

Abstract: Sheath blight of rice caused by Rhizoctonia solani Kuhn [teleomorph; Thanatephorus cucumeris (Frank) Donk] is most widely distributed and cause substantial yield loss. It is measure production constraint in high yielding varieties under intensive rice production system. The pathogen has very wide host range and exhibits considerable pathogenic and molecular variability. Due to non-availability of resistant cultivars, the management of sheath blight primarily dependence on chemical control. The present study focused on better chemical molecules for the management of this disease. In view of above seven fungicides (Difenoconazole 25% EC, Isoprothiolane 40% EC, Kasugamycin 3% SL, Kitazin 48% EC, Propineb 40% WP, Tebuconazole 25.9% EC and Thifluzamide 24% EC) were evaluated at 100, 200 and 500 ppm concentration in vitro against sheath blight pathogen. Difenoconazole 25% EC, Tebuconazole 25.9% EC and Thifluzamide 24% EC completely inhibited the growth of R. solani at all concentrations. Whereas as some mycelial growth of the pathogen were observed at 500 ppm after 72 hours in Isoprothiolane 40% EC and Kasugamycin 3% SL whereas very less growth in other fungicides treated plates. However all these fungicides were used to manage the sheath blight of rice under field condition also. Among these fungicides Tebuconazole 25.9% EC, Difenoconazole 25% EC were found highly effective followed by Thifluzamide 24% EC in comparison to other fungicides.

DOI: 10.33545/26174693.2024.v8.i1Sa.283