This disease is caused by a fungus called Cacopsora pachyrhizi. When the temperature remains between 18 to 28 degree Celsius due to continuous rains or the expected humidity is around 80 percent or leaves remain wet, then the possibility of Rust disease increases.
On the leaves of plants affected by this disease, needle-tip-shaped spots appear on the lower surface. Within a short time, these spots start growing in groups and spread over the entire leaf. They emit a brown powder which falls on the healthy leaves and increases the severity of the disease.
Spray Novacone (Hexaconazole 5% EC) 300 ml or Galileo (Picoxystrobin 22.52% w/w SC) 160 ml/acre in 150 liters of water at the initial stage of the disease.
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