Agricultural crops :: Pulses :: Blackgram
Cercospora leaf spot: Cercospora canescens
| Field diagnostic symptoms |
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Numerous spots with pale brown/grey centre and reddish/dark brown margin on leaves, branches and pods.
- Defoliation during flower and pod formation.
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Severe infection leads to premature senescence
Cercospora infected plants
Causal agent
Cercospora canescens
- Condiophores - long, multi septate, straight or slightly curved, light brown to brown
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Conidia - sub hyaline or pale oliovaceous, multi septate or slightly curved with obconic base
Conidia and Conidiophores
- Survival: Seed and infected plant debris
- Spread: Wind-borne conidia
Favourable conditions
- Humid weather
- Drizzling
- Dense plant population
Integrated disease management
- Remove and burn infected plant debris
- Spray any one of the following fungicides at initiation of disease and second spray at 10 days later.
Carbendazim 50% WP @ 500 g/ha
Mancozeb 72 WP @1000g/ha
Tebuconazole 25.9% EC @ 500 ml/ha
Azoxystrobin 5.1%w/w + Tebuconazole 9.1% w/w + Prochloraz 18.2 % w/w EC @ 1250 ml/ha
Metiram 55% + Pyraclostrobin 5% WG @ 1500-1750ml/ha
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