Diseases of fruit plantation medicinal and aromatic crops (2+1)

Bacterial canker

Causal organism: Pseudomonas syringae pv. syringae vanHall.
SYMPTOMS

• The disease attacks trunk, limbs, shoots, fruit spurs, blossoms, 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

• Primary source of inoculum: Infected plant part
  
• Secondary source of inoculum: Air borne bacterial cell.
  


MANAGEMENT

• Cut and burn the infected plant part.
• Aerial spray of streptocycline (0.5g/ litre) is effective.
• Resistant varieties like -Barbank, Black champa, Elephant Heart & Maripo should be cultivated