🌿 Cotton Disease Identification & Management
Alternaria Leaf Spot
Identification • Symptoms • Treatment / Management
🔍
Identification
Carefully inspect the leaves for characteristic spots and patterns.
🟤 Brown/Black Circular SpotsBrown or black circular spots may appear on the leaves.
📈 Spots EnlargeThe spots gradually increase in size.
🎯 Concentric RingsSeveral spots may develop concentric rings.
🍂 Leaf FallUnder severe infection, leaves may fall prematurely.
🛡️
Treatment / Management
Important:Management should focus on field sanitation, canopy and moisture management, and appropriate use of a registered fungicide according to the label dose when necessary.
1
Manage Infected Leaves/Residue
Properly manage infected leaves and crop residues.
Properly manage infected leaves and crop residues.
2
Maintain Air Circulation
Maintain adequate air circulation within the crop canopy.
Maintain adequate air circulation within the crop canopy.
3
Avoid Excess Nitrogen
Avoid excessive nitrogen use and maintain balanced crop nutrition.
Avoid excessive nitrogen use and maintain balanced crop nutrition.
4
Manage Irrigation & Humidity
Manage irrigation carefully and reduce excessive humidity and prolonged leaf wetness.
Manage irrigation carefully and reduce excessive humidity and prolonged leaf wetness.
5
Registered Fungicide
If necessary, spray a registered fungicide for cotton according to the label dose.
If necessary, spray a registered fungicide for cotton according to the label dose.
6
Rotate Modes of Action
Use appropriate mode-of-action rotation as part of fungicide resistance management.
Use appropriate mode-of-action rotation as part of fungicide resistance management.
💡
Identification Tip
Look for these signs:
If brown/black circular spots gradually enlarge and several spots show concentric rings, consider the possibility of Alternaria Leaf Spot.
If brown/black circular spots gradually enlarge and several spots show concentric rings, consider the possibility of Alternaria Leaf Spot.