Early symptoms of bacterial streak include small, water-soaked areas between leaf veins. These water-soaked areas become tan streaks within a few days. When the disease is severe, streaks may merge to form large, irregular areas of dead tissue. When dew is present, the bacteria causing this disease may ooze from the lesions and dry to form a clear, thin film. This film flakes easily and is visible when the leaf is viewed from different angles.
Pest photo source
Erick De Wolf et al. KSU