TNAU Agritech Portal
Home | About Us | Success Stories | Farmers Association | Farmers' Innovation | Publications | Contact

Agricultural crops :: Pulses :: Blackgram

Cercospora leaf spot: Cercospora canescens

Field diagnostic symptoms
  • Numerous spots with pale brown/grey centre and reddish/dark brown margin on leaves, branches and pods.
  • Defoliation during flower and pod formation.
  • 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
  • Conidia - sub hyaline or pale oliovaceous, multi septate or slightly curved with obconic base

 Conidia and Conidiophores

Survival and mode of spread
  • 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.
    1. 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
Updated on Jun 2023

Home | About Us | Success Stories | Farmers Association | Farmers' Innovation | Publications | Contact Us

© 2008 - 2023 TNAU. All Rights Reserved.