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1. Welcome
Dhiman Adhikary
Student Id: 17 P. Path JJ-
02M

2. Presentation Topic
Integrated Disease Management
of
Angular Leaf Spot of Cotton

3. Angular Leaf Spot of Cotton
Causal Organism:
Xanthomonas axonopodis pv. malvacearum
Also known as
Bacterial leaf spot, Vein blight, Boll rot or black
arm

4. Symptoms
• Dark green, watersoaked,
angular lesions across the
leaves and bracts
• Especially on the under
surface of leaves
Spot on Bracts

5. Symptoms
Sometimes extensive dark
green, water soaked
lesions along the veins
known as vein blight.

6. Symptoms
• Dark green, watersoaked,
greasy, circular across the
bolls
• When boll matures the
lesions dry out and
prevent normal boll
opening. It is called "Boll

7. Favourable Factors for this
disease
 Temperature is over 25ºC and
 Relative humidity exceeds 85%
 Low-organic-matter in soils

8. IDM for angular leaf spot of cotton
IDM for
Angular
leaf spot
of cotton
Regular
monitoring
Quarantine
1. Exclusion of the
pathogen
2. Seed treatment by H2SO4
(100 ml/kg) with bio-
fungicides or any
systemic fungicides
Use of resistant
varieties/cultivar
s
MCU 10, L 604, L
389
Cultural practices
i. Time of sowing(Sept-
Nov)
ii. Crop rotation (Cotton-
sorghum-alfalfa-onion)
iii. Irrigation management
iv. Excessive application
certain organic manures
v. Field sanitation
vi. Incorporation of
compost
Biological control
PGPR (Bacillus,
Pseudomonas, Streptomyces)
and the fungal genera
Trichoderma
Chemical control
Carbendazim 50 WP
Benzothiodiazole group
chemical (Bion)

9. Thanks To All