Bacterial leaf streak ( Xanthomonas oryzae pv. Oryzicola)

• Occurring in some areas during very wet seasons and where high rates of nitrogen fertilizer are used.
• It causes narrow, dark-greenish, water-soaked, interveinal streaks of various lengths, initially restricted to the leaf blades.
• The lesions enlarge, turn yellowish-orange to brown (depending on cultivar), and eventually coalesce.
• BLS is not a systemic disease. its affect only parenchymatus tissue.

• Bacterial leaf streak may be confused with narrow brown spot.
• To conform leaf streak lesions are usually thinner than those of narrow brown spot
• narrow brown spot lesions are not translucent, nor do they produce bacterial ooze.

Favorable condition:

• favorable temperatures is 25−34°C
• relative humidity above 70%
• high nitrogen application

Survive and spread:

• Survive: seeds and infected stubbles to the next planting season.
• Spread: Infected leaf through water, insect.

Management:

• Plant resistant varieties.
• Treat seeds with hot water. Soak the seed in Streptocycline (250 ppm) followed by hot water treatment at 52 0C for 30 minutes eradicates seedling infection.
• Spray Streptocycline (250 ppm) along with copper oxychloride (0.3%)