Symptoms
- The next trifoliate leaves emerging from the growing apex show irregular yellow and green patches alternating with each other.
- Spots gradually increase in size and ultimately some leaves turn completely yellow.
- Infected leaves also show necrotic symptoms.
- Diseased plants are stunted, mature late and produce very few flowers and pods.
- Pods of infected plants are reduced in size and turn yellow in colour.
Management
- Growing resistant varieties such as VBN 4, VBN 6 and VBN 7
- Installation of yellow sticky traps 12 nos/ha
- Rogue out the infected plants up to 45 days
Dept of Agriculture Development 
SFAC Kerala