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Bioecology of cut worm

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Bioecology of cut worm

Mythimna seperata (Climbing cut worm):

  • The adult moths are pale and reddish brown in colour, and have a very hairy body covered with dark specks and patches.
  • Whitish to pale yellow eggs are laid between the leaf sheaths and the stem in clusters of several rows.
  • The dark or greenish grey larvae are nocturnal, remaining hidden under foliage or debris in the day but feeding actively from dusk to dawn.
  • The fifth- to sixth-instar larvae become gregarious and are voracious feeders.
  • The full-grown larvae crawl down into the soil for pupation.

Spodoptera litura (Common cut worm):

  • Pearly white, round eggs are laid in clusters on both sides of the leaves of various plants.
  • The clusters are covered with short yellowish brown hairs from the abdominal tips of the female moths.
  • The larvae are gregarious up to the third instar and may later disperse.
  • The full-grown larva has a cylindrical body and is brown or brownish black tinged with orange.
  • The abdominal segments have generally two light, brownish lateral lines on each side—one above and one below the spiracles.
File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
Photo Courtesy: 
CRRI
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