| Rice gall midge (GM) is an important insect pest in the upper north of Thailand i.e. Tak, Phrae, Lampang, Nan, Phayao, Mae Hong Son, Chiang Rai and Chiang Mai provinces. Severe infestations generally occur during September to October. Prior to this study, only MN62M and RD4, the two glutinous rice varieties were recommended as resistant ones. Hence, the non-glutinous type with resistance to GM is in urgent need. The research has been conducted for 12 years during 2001 - 2012. The cross was made between PRE92039-3-1-2-1 and SPT82022-PRE-26-3-2-GM-6. Populations were selected continuously from F2 to F6 after which study and evaluation were carried out in successive steps from observational nursery, intra-station yield trial, inter-station yield trial and... |
