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Crop Protection :: Pest of paddy

Rice earhead bug: Leptocorisa acuta

Symptoms of damage:

  • Nymphs and adults suck the sap from individual grains, which are in milky stage.
  • Individual grains become chaffy
  • Black spots on the grains at the site of feeding puncture.
  • Buggy odour in rice field during milky stage

Identification of insect pest:

  • Egg: Circular, brownish seed like 2mm long laid in clusters in two rows along the midrib on the upper surface of the leaf blade
  • Nymph: First instar is small, 2mm long, pale green in colour which grows to dark green through different instars
  • Adult: Greenish yellow, long and slender, above ½ inch in length with a characteristic buggy odour

Management:

ETL: 5 bugs/100 earheads at flowering and 16 bugs/100 earheads from milky stage to grain maturity

  • Dust any one of the following at 10 kg/ac twice, the first during flowering and second a week later:
    • Quinalphos 1.5 D
    • KKM 10 D (KKM dust formulation consists of 10% of Acorus calamus rhizome powder and 90% of fly ash which is a waste product from Thermal Power Station)
  • Spray any one of the following twice as above
    • Malathion 50 EC 200 ml/ac
    • Neem seed kernel extract 5% 10 kg/ac
    • Notchi or Ipomoea or Prosopis leaf extract 10%

Earhead Bug Feeding Injuries

Adult feeding on the grains

Earhead Bug Eggs Nymph
Adult

 

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