Grass blue butterfly

Grass blue butterfly: Euchrysops cnejus

Symptoms of damage

  • Buds, flowers and young pods with boreholes and presence of slug-like caterpillar.
  • Larval entry hole on the pod is plugged with excreta.

Identification of the pest

  • Larva – pale green or yellow with a red line and short black hairs on the body.
  • Adult– The butterfly is blue, medium sized with 5 black spots on the hind wings and two black spots in the inner margin.

Management of pod borer complex

  • ETL 10% affected parts
  • Deep summer ploughing in 2-3 years to eliminate quiescent pupa.
  • Early sowing, short duration varieties.
  • Avoid closer plant spacing.
  • Grow tall sorghum as comparison crop to serve as biological bird perches
  • Collect and destroy larvae and adults to the extent possible
  • Install pheromone traps at a distance of 50 m @ 5 traps/ha for each insect pest.
  • Install Bird perches @ 50/ha.
  • Setting of light traps (1 light trap/5 acre) to kill moth population.
  • Control is achieved by releasing of Trichogramma chlionis at weekly intervals @1.5 lakh/ha/ week for four times.
  • Conserve green lacewing, predatory stink bugs, spider, ants
  • Application of NPV 250 LE /ha with teepol 0.1% and Jaggery 0.5% thrice at 10 – 15 days interval commencing from the flowering stage. (Note: Insecticide / Ha NPV spray should be applied when the larvae are in early stage).
  • Bt @ 600 g, neem oil/ pungum oil 80 EC @ 2ml/lit
  • Spray NSKE 5% twice followed by triazophos 0.05%.
  • Apply any one of insecticides at 25 kg/ha. quinalphos 4D, carbaryl 5D
  • Quinalphos 25 EC @ 1000 ml/ha.



  • TamilNadu Agritech Portal
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