SCS121 CL and SCS122 Miura: risks and opportunities in the adoption of irrigated rice cultivars in Santa Catarina

Abstract

Nowadays, one of the 22 irrigated rice cultivars released by Epagri for  Santa Catarina, the SCS121 CL, has an hegemonic predominance in the rice fields of the State. Biologic and strategically, this is of great concern for the State’s rice production because it constitutes a risk for the Clearfield (CL) rice production system. Besides, it means an intense selection pressure even in the phytosanitary area, especially regarding blast. The rapid adoption of SCS121 CL is due to its good yield, unquestionable and easy weed management (also allowing the sow in drained soil), and its tolerance to blast. In this way, it is often used, in situations out of its purpose, which is the control of weedy rice. Data from field experiments and demonstration units indicate that there are cultivars with higher yield than the SCS121 CL and, therefore, they are good options for fields not infested with weedy rice. In this sense, one good option is the brand new cultivar SCS122 Miura.