Bacterial Leaf Blight caused by the bacterial pathogen Xanthomonas oryzae pv. oryzae (Xoo) limits rice yield in all major rice growing regions of the world, especially in irrigated lowland and rainfed conditions where predisposition factors favour disease development to epidemic proportions. Since bacterial pathogens are difficult to manage, development of host plant resistance is the most effective means of disease management.To combat the problem of resistance breakdown, pyramiding of resistance genes into different cultivars is being carried out. The present book deals with the gene specific marker for detection of BLB resistance genes in rice genotypes.