Evaluation of New Generation Fungicidal Molecules for the Management of Sheath Blight (Rhizoctonia solani Kuhn) of Rice

摘要

A number of new and commercially available fungicides were evaluated against sheath blight of rice at Regional Research and Technology Transfer Station, Chiplima, Sambalpur, Odisha. Under in vitro, 100 per cent inhibition of mycelial growth of Rhizoctonia solani was observed with the fungicide (Trifloxystrobin + Tebuconazole) at 200 ppm concentration. Besides, it also had the lowest ED_(50) value of 3.19 fig ml~(-1). Under in vivo, the pooled data of two consecutive kharif season indicated that, all the fungicides were effective in controlling the disease as compared to control but three spraying with (Trifloxystrobin + Tebuconazole) @ 0.4 g l~(-1) at 15 days interval resulted in least sheath blight disease severity (5.0% PDI) as compared to untreated control (41.85% PDI). It was at par with the standard fungicide Propiconazole @ 1ml l~(-1) (6.11 % PDI) with the highest yield of 51.9 q ha~(-1).