Diseases of Fruit Plantation Medicinal and Aromatic Crops

Angular leaf spot

Causal organism: Xanthomonas azadiractae
Symptoms

• Initially water soaked, angular spots appear on the leaf, which later turn into pale yellow in colour with oily appearance.
• Blightening, dry of leaf, defoliation followed by cell necrosis.
Etiology

• Pathogen is microscopic, unicellular, reproduction by binary fission, monotrichous, motile, gram –ve and rod shaped.
• Primary sources of inoculum: Affected plant debris (corky area of the leaves)
• Secondary sources of inoculum: Rain splash and air borne bacterial cells
• Entry: through stomata
Management

• Use healthy planting material and disease free area
• Cut and burn the infected plants
• Regular pruning
• Maintain recommended NP balance and increase K application in the soil.
• Drip irrigation helps in reducing disease incidence.
• Chemical: copper oxychloride( 0.3%) and Streptocycline (0.05%) sprays on the trees