The characteristic symptom is narrow brownish yellow translucent interveinal lines 0.5 to 5 mm joining to form large dirty white patches.
Yellow halo is noticed around the lesions in susceptible varieties.
Towards the later phase of the disease, the entire leaves turn yellow in colour which closely resembles the symptoms of bacterial leaf blight.
Bacterial ooze exuding from the leaves may dry up to form beads.
The symptoms of Bacterial Leaf Streak looks similar to that of narrow brown leaf spot caused by Cercospora, at later stage when the streaks coalese the symptoms resemble that of Bacterial Leaf Blight . However, this can be distinguished by its inner translucent lesions with yellow bacterial ooze.
Management
Use of disease free seeds.
Destruction of collateral weed hosts.
Apply neem cake coated urea as recommended under fertilizer application.
Apply 50 % more potash than normal recommended dosage in split application.
Follow proper weed control.
Spraying fresh cow dung extract (20g cow dung is mixed in 1L water and allowed to settle and sieved). The supernatant is taken for spraying @500l/Ha. Spraying antibiotics like Streptocycline 15g/300l/ha. Agrimycin 100 750g/500l/Ha.
Spray Azadirachtin 0.03% EC or Azadirachtin 0.15% w/w @ 2.5 L/ha at the time of first disease appearance.
Eradication of bacterium by soaking the seeds in Agrimycin 100-250 ppm (2.5g/10kg seed) for 12 hours, followed by hot water treatment at 52oC for 30 minutes.
In Bacterial Leaf Streak prone areas treat the seeds with bleaching powder (100g/L)and Zinc sulphate (2%).
Apply of bleaching powder at the rate of 5kg/ha in the irrigation water to check the spread of Bacterial Leaf Streak.
Spray antibiotics viz. Streptocycline - (15 gram/ 300 litre of water/ha) or Streptomycin sulphate + Tetracycline hydrochloride (Agrimycin 100 or Plantomycin (750 gram/ 500 litre of water/ ha) in severe cases.
