Soybean Bacterial blight

Soybean Bacterial blightPseudomonas syringae pv. glycinea

Symptom:
  • Seeds may develop raised or sunken lesions and become shrivelled and discoloured.
  • Small, angular, translucent, water-soaked, yellow to light brown spots appear on leaves.
  • Young leaves are most infected and are destroyed, stunted and chlorotic.
  • Angular lesions enlarge and merge to produce large, irregular dead areas.
  • Early defoliation of lower leaves may occur.
  • Large, black lesions develop on stems and petioles.
Management:
  • Deep summer ploughing.
  • Use healthy/certified seeds.
  • Destroy infected crop debris
  • Seed treatment with streptocyclin @ 250 ppm (2.5 g/10 kg seeds).
  • Application of any copper fungicides @ 2 g/lit along with streptocyclin at the rate of 250 ppm (2.5 g/10 lit water).

 

Source-

  • TamilNadu Agritech Portal