Abstract
A thorough study of physiological and biochemical characteristics of 40 isolates of Xanthomonas oryzae from Asia revealed that no distinct biochemical groups or types exist in blight pathogen, which would suggest that the isolates even from wide geographical regions are much more homogeneous in their reaction than described in literature. The present description can be considered as norms of this species in identifying it when seperated from host and also to differentiate it from other nomenspecies of Xanthomonas.
