Bacterial Leaf Streak

in Keycheck7 Pest Management

Local name: naggapula (Ilonggo)

Causal organism: Xanthomonas oryzae p.v. oryzicola (Fang et al.) Swings et al.

Where to find: On leaves

Symptoms: fine translucent streaks that enlarge lengthwise; coalesce (merging lesions ) form large brown affected leaves; later stage, entire leaf turns brown and withers

Susceptible stage: tillering to maturity
Note: wind-borne, present in lowland and upland fields

Disease development and severity is favored by:

  • Excessive nitrogen fertilization;
  • Injured leaves; and
  • High humidity, rain.

Disease Cycle

Little is known except:

  • Bacteria enter leaves through stomata and wounds
  • Bacterial cells are discharged on leaf surface at night
  • Disease is spread by irrigation water and seeds

Disease Management

  • Plant certified seeds
  • Avoid high dose of nitrogen
  • Destroy infected crop residue

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