MANAGEMENT OF SHEATH BLIGHT (RHIZOCTONIA SOLANI) OF RICE THROUGH SELECTED CHEMICALS AND SOIL AMENDMENT

Abstract

Efficacy or fourteen treatments viz. T1 (Bavistin 50 WP). T2 (Tilt 250 EC), T3 (Champion 77 WP), T4 (Cupravit 50 WP), T5 (Bleaching powder, BP), T6 (Bavistin 50 WP+ BP), T7 (Tilt 250 EC+ BP), T8 (Champion 77 WP+ BP), T9 (Cupravit 50 WP + BP), T10 (Ash)~ T11 (Sawdust), T12 (Khudcpana), T13 (Poultry manure) and T14 (Control) were assessed against Rhizoctonia solani for the management of sheath blight of rice (BR 3) during March to August, 2007 at the farm of Shcr-c-Bangla Agricultural University (SAU), Dhaka. Effect of different treatments against sheath blight of rice differed significantly in terms of 0/o Relative Lesion Height (RLI·n, number of infected tiller per hill, lesion size. length of paniclc, number of filled and unfilled grain, grain yield (ton/ha), straw yield (ton/ha) and weight of l 000 grains weight. Among the treatments tested, T 6 AMENDMENT ABSTRACT (Bavistin SO WP + BP) showed the best performance in reducing disease incidence and disease severity as well as increasing yield of rice followed by T7 ( I'ilt 250 EC + BP) and T (Champion 77 WP + BP). The treatment T6 (Bavistin 50 WP + BP) reduced upto 54.09o/o RLH and increased grain yield by 37.34% over control which was followed by Tilt 250 EC + BP (52.12%. 32.62%) and Champion 50 WP+ BP (49. l 0%. 31.94%), respectively. The fungicides alone also showed better performances but the soil amendment alone had no remarkable effect in controlling sheath blight of rice.