🌿 Cotton Disease Identification & Management
Bacterial Blight / Angular Leaf Spot
Cause • Symptoms • Management
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Cause
Bacteria
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Symptoms
💧 Water-soaked spotsSmall water-soaked spots may appear on the leaves.
🟤 Brown / Black spotsThe spots later become brown or black.
🔷 Angular spotsThe lesions often appear angular.
〰️ Vein-associated infectionInfection may progress around the leaf veins.
🖤 Black ArmDark stem lesions may develop and severe cases may show the Black Arm symptom.
🌸 Boll infectionWhen bolls are infected, dark spots or rot may develop.
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Treatment / Management
Important:This is a bacterial disease. Management should focus on reducing infected residue and seed-borne risk while avoiding prolonged leaf wetness.
1
Remove Crop Residue
Do not leave infected crop residue in the field.
Do not leave infected crop residue in the field.
2
Use Certified Seed
Use healthy, certified seed.
Use healthy, certified seed.
3
Seed Treatment
Carry out seed treatment according to local agricultural recommendations.
Carry out seed treatment according to local agricultural recommendations.
4
Reduce Leaf Wetness
Avoid prolonged field moisture and long periods of leaf wetness.
Avoid prolonged field moisture and long periods of leaf wetness.
5
Do Not Save Seed
Do not save seed from a diseased field for the next season.
Do not save seed from a diseased field for the next season.
6
Bactericidal / Copper Treatment
When necessary, use a registered bactericidal or copper-based treatment according to local recommendations.
When necessary, use a registered bactericidal or copper-based treatment according to local recommendations.
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Identification Tip
Look for these signs:
If water-soaked spots later become brown/black and angular, with infection developing around the veins, consider the possibility of bacterial blight.
If water-soaked spots later become brown/black and angular, with infection developing around the veins, consider the possibility of bacterial blight.