This new variety is a cross between RD6 and Jao Hom Nil rice using molecular markers in the backcross breeding process. RD18 is photoperiod-sensitive, with an average height of 158 cm, and resistant to blast disease especially during the seedling stage. Suitable for rainfed lowland area in the upper north and northeast Thailand where blast disease is prevalent, it provides an average yield of 3.8 tonnes/hectare (609 kg/rai). RD18 maintains excellent grain and cooking qualities of RD6.
RD18 was developed by Rice Gene Discovery Unit, in collaboration with various research partners, namely Kasetsart University, Rajamangala University of Technology Lanna (RMUTL) and the Rice Department.
RD18 was certified by the Rice Department on 19 August 2013.