Agricultural crops :: Cash crops :: Cotton
Alterneria leaf blight: Alternaria macrospora
Symptom
- The disease may occur in all stages but more severe when plants are 45-60 days old.
- Small, plate to brown, irregular or round spots, may appear on the leaves.
- Each spot has a central lesion surrounded by concentric rings.
- Several spots coalesce together to form blighted areas.
- The affected leaves become brittle and fall off.
- Sometimes stem lesions are also seen.
- In severe cases, the spots may appear on bracts and bolls.
Management
- Remove and destroy the infected plant residues.
- Spray Mancozeb or Copper oxychloride at 2kg/ha at the intimation of the disease.
- Two to three sprays may be given at 15 days interval.
|
|
|