• Symptoms often vary as a result of systemic infection.
• Leaf symptoms begin as chlorosis at the base and successively higher leaves show progressively greater chlorosis.
• Infected chlorotic leaf areas can support abundant white asexual sporulation on the lower leaf surface.
• Severely infected plants are generally stunted and do not produce panicles.
• Green ear symptoms result from transformation of floral parts into leafy structures.

Management

• Grow downy mildew resistant varieties CO7, WCC 75, CO(Cu)9, TNAU-Cumbu Hybrid-CO9
• Transplanting reduces disease incidence. At the time of planting infected seedlings should be removed.
• In the direct sown crop, infested plants should be removed up to 45 days of sowing as and when the symptoms are noticed.
• Spray any one of the fungicides Metalaxyl + Mancozeb @500 g or Mancozeb 1000g/ha