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

Bacterial leaf spot

Causal organism: Pseudomonas morus-prunorum.
SYMPTOMS

• Small, circular green spots occur on the leaves.
• Later spots become angular, deep purple to black.
• The spotted area falls and shot holes are formed.
• Severe disease infection leads to defoliation which devitalizes the tree.
• Circular spots are noticed on fruits. These are water-soaked initially and become black.
• Due to intense spotting on the fruits, pitting or cracking occurs in the vicinity of spots.
• Twig canker results in the death of branch.
 
MANAGEMENT

• Cut and burn the infected plant parts.
• Spraying with zinc sulphate-lime solution as a mixture is effective.