• Circular, black, sunken spots with dark center and bright red orange margins on leaves and pods.
• Severe infections spread entire leaf gives blighted appearance
• Affected parts wither off.

Causal organism

Colletotrichum lindemuthianum

• Mycelium - hyaline, septate and branched
• Conidiophores - hyaline, short and unbranched
• Conidia - hyaline, one celled, oblong, cylindrical with rounded ends
• Perfect stage perithecia produce ascus contains 8 ascospores

Conidia

Survival and mode of spread

• Survival: Seed, plant debris and soil-borne
• Primary spread: Seed and plant debris
• Secondary spread: air-borne conidia
• Rain splash also helps in the dissemination of the fungus

Favourable conditions

• Temperature : 15-20°C
• Relative humidity : Above 90 per cent
• Cloudy rainy weather

Integrated disease management

• Remove and destruct plant debris
• Seed treatment with Carbendazim @ 2g/kg
• Spray any one of the following fungicides at initial symptom appearance
Mancozeb 72 WP @ 1000g/ha
Carbendazim 50% WP @ 500/ha
Tebuconazole 50% + trifloxystrobin 25% WG @ 500 g/ha
Tebuconazole 25.9% EC @ 500 ml/ha