Diseases of Fruit Plantation Medicinal and Aromatic Crops

Bacterial canker

Causal organism: Pseudomonas syringae pv.syringae (van Hall).
SYMPTOMS

• The disease attacks trunk, limbs, shoots, fruit spurs, blossom, dormant buds, leaves and fruits.
• The bark and outer sap wood show circular to elongated, water –soaked lesions.
• Bark becomes brown and gummy.
• The girdled branches die.
• Blossom blight occurs and purple lesions appear on leaves.
Source of inoculum

• PSI: Infected plant
  
• SSI: Air borne bacterial cell.



Life cycle

Management

• Cut & burn the infected plant parts.
• Aerial spray of streptocycline 0.5g/ litre
• Growing of resistant varieties -Barbank, Black champa, Elephant Heart and Mariposa.