Leaf blight: Alternaria alternata

Symptoms

• Initially, small circular brown spots appear on the leaves. Later the spots enlarge with characteristic concentric rings and leads to blighting of entire leaves.

Management

• Spray Bacillus subtilis 2g/l of water on 30 and 60 days after planting.

Root rot and tuber rot: Macrophomina phaseolina

Symptoms

• Yellowing of leaves, discolouration and rotting of roots and dark brown lesions on the stem are the prominent symptoms. Rotting of tubers also occur.
• The presence of sclerotial bodies as small, black dot like structures are seen in the stem portions.

Management

• Tuber treatment with Pseudomonas fluorescens @ 2 g/1 lit of water for 20 minutes.
• Drenching with Bacillus subtilis 2g/l of water on 30 days after planting.

Content validator and Image source:

Dr. B. Meena, Assistant professor, Department of Medicinal and Aromatic plants, TNAU, Coimbatore-641003.