bacterial disease response barley leaf streak resistance Causal agent: Xanthomonas translucens pv. translucens and pv. undulosa. plant_trait_ontology jaiswalp 2011-08-19T12:58:34Z TO:0020066 Symptoms: small, light to pale green spots which later expand into linear streaks. Streaks can extend the entire length of the leaf, that will become translucent. Infected leaves will turn yellow then brown as it dies.