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In Rajasthan, bacterial stripe & black chaff disease of barley
(Hordeum vulgare) caused by Xanthomonas campestris pv. translucens
has become an upcoming and endemic disease in recent years. The
bacterium was found to be seed-borne Seed to seedling transmission
of the bacterium showed a quantitative relationship in the density
of contaminated / infected seed. The pathway of the bacterium from
germinating seed was observed emanating from the husk (glumes) and
pericarp to coleoptile and above ground aerial plant parts. The
bacterium was observed located in the intercellular spaces of
parenchymatous cells with dissolution of cell walls leading to
cavities full of bacterial masses which in turn converted stripes
into blotches. Seed transmission studies indicated that infected
seed is an important primary source of inoculum and recurrence of
the disease from one season to next. Meteorological observations
indicated that the temperature and relative humidity, played an
important role in the initiation and development of the disease. In
terms of epidemiology, the present barley production system in the
area under study revealed that irrigation with overhead sprinklers
favours the disease.
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