Symptom

• Round or irregular greyish spots appear on leaves.
• The spots may have dark brown or blackish borders in older leaves.

Survival and Mode of Spread

• The pathogen survives in the infected plant debris as conidia
• The conidia are disseminated by wind or rain splash.

Favourable Conditions

• Dense planting .
• Cloudy weather coupled with intermittent rain followed by dry weather.
• High Relative humidity .

Management

• Remove and destroy the infected plant residues.
• Spray Mancozeb @ 400g/ acre or Copper oxychloride @ 500 g/ acre or Carbendazim 50% WP @ 200g/acre or Propiconazole @ 200 ml/ acre or Metiram 55% + Pyraclostrobin 5% WG @ 200g/acre or Kresoxim-methyl 44.3% SC @ 200 ml/ acre at the intimation of the disease.

• Online resources
• CPG 2020