Evaluation of bio efficacy and Phytotoxicity of new molecule tebuconazole 15%+Zineb 57% WG against sheath blight, blast and brown spot of rice

Abstract

A field experiment to evaluate the bio efficacy and Phytotoxicity of new molecule Tebuconazole 15%+Zineb 57% WG against sheath blight, blast and brown spot of rice was undertaken during Kharif 2016-17 (season I) and 2017-18(season II) in the RRS (OAZ), UBKV, Majhian, Dakshin Dinajpur. The result revealed that all the treatments were superior over control and the treatment T3 (Tebuconazole 15%+Zineb 57% WG) @1500 g/ha showed lowest PDI against sheath blight (10.82 after 1st spray & 15.09 after 2nd spay during season I and 9.84 after 1st spray and 14.39 after 2nd spray during season II), blast (1.4 after 1st spray and 3.34 after 2nd spray & 2.54 after 1st spray & 4.87 after 2nd spray during season II ) and brown spot (3.21 after 1st spray and 4.10 after 2nd spray during season I and 4.19 after 1st spay & 6.90 after 2nd spray during season II). The highest yield (34.24 q/ha during season I and 34.16 q/ha during season II) was found in the treatment T3 (Tebuconazole 15%+Zineb 57% WG) @1500 g/ha. Considering the 2 parameters PDI and yield, it was found that T3 (Tebuconazole 15%+Zineb 57% WG) @1500 g/ha was the most effective treatment. Phytotoxicity studies revealed that none of the doses of Tebuconazole 15%+Zineb 57% WG exhibited any Phytotoxicity sign or symptoms in comparison to untreated control during both the seasons.