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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.
Insect Pests of Rice by M. D. Pathak and Z. R. Khan