Bihar hairy caterpillar

Bihar hairy caterpillar: Spilosoma obliqua

Symptoms of damage

  • Young larvae feed gregariously on chlorophyll mostly on the under surface of the leaves, due to which the leaves look like brownish-yellow in colour.
  • In later stages, the larvae eat the leaves from the margin.
  • The leaves of the plant give an appearance of net or web

Identification of the pest

  • Eggs: Laid in a cluster on the underside of leaves.
  • Larva: Covered with long yellowish to black hairs
  • Adult: Medium sized brown moth with a red abdomen


  • Deep summer ploughing.
  • Avoid pre-monsoon sowing.
  • Use optimum seed rate.
  • Adequate plant spacing should be provided
  • Intercrop soybean either with (early maturing) pigeon pea variety or maize or sorghum in the sequence of 4:2 should be practiced.
  • Collect & destroy infested plant parts, egg masses and young larvae.
  • Field Sanitation: Remove the infested plant parts at least once in 10 days and bury them in compost pit to monitor and reduce the population.
  • Light Trap: Install one light trap (200W mercury vapour lamp) per hectare to catch the adults of some nocturnal pests such as hairy caterpillar (positively phototropic).
  • Apply chlorpyriphos 20 EC @ 1.5 lit/ha or trizophos 40 EC @ 0.8 Lit/ha or quinalphos 25 EC @ 1.5 lit/ha.
  • Dust Chlorpyriphos 1.5% DP quinalphos 1.5% @ 25kg/ha when the population is likely to reach 10/m row length (ETL). Repeat it as needed.



  • TamilNadu Agritech Portal
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