Spiny beetle

Spiny beetle: Rice hispa, Dicladispa armigera

Symptoms of damage:

  • Tunneling through leaf tissue causing irregular translucent white patches that are parallel to the leaf veins
  • Adults feed on chlorophyll by scraping and causing white parallel streaks
  • Grubs mine into the leaves and make blister near leaf tips.
  • Damaged leaves fall down
  • At server infestation, field looks like burnt appearance.

Identification of insect pest:

  • Egg: Eggs are laid inside minute slits on the tender leaves generally toward the tip
  • Larva: The grub is whitish yellow and flattened. It feeds inside the leaf tissue by mining. It pupates inside
  • Adult: The adult beetle is somewhat square shaped about 1/6 to 1/8” in length and width. Dark blue or blackish in colour with spines all over the body.

Management:

  • Spray any one of the following insectcides
  • Carbofuran 3% CG 50 kg/ha
  • Chlorpyriphos 20% EC 1250ml/ha
  • Malathion 50%EC 1150 ml/ha
  • Triazophos 40% EC 625-1250 ml/ha

 

Source-

  • TNAU Agritech Portal