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Spinning Behaviour of Two Species of Rice Leaffolders, Cnaphalocrocis Medinalis (Guenée) and Marasmia Patnalis Bradley (Lepidoptera: Pyralidae)

  • M. L. P. Abenes
  • Z. R. Khan
Article

Abstract

Two species of rice leaffolders, Cnaphalocrocis medinalis (Guenée) and Marasmia patnalis Bradley are usually found in association on rice plants in South and Southeast Asia. Larvae of the two species are similar in morphology, as is their feeding behaviour. Spinning, the process of stitching leaf margins together to form a leaf roll before the initiation of feeding process, is an important behaviour of leaffolder larvae. The spinning behaviour of two species of rice leaffolders was compared to find out if accurate differentiation between larvae of the two species is possible. The manner of spinning, average number of stitch bands made, average time spent to complete one band, order of spinning, number of turns taken by the larvae per band made, and feeding behaviour, while spinning a leaf roll were compared. The results revealed that the two leaffolder species have similar spinning behaviour.

Key Words

Rice leaffolders Cnaphalocrocis medinalis Marasmia patnalis spinning behaviour 

Résumé

Deux espéces de tordeuses des feuilles, Cnaphalocrocis medinalis (Guenée) et Marasmia patnalis Bradley sont habituellement identifiqes en association avec des plantes de riz en Asie du Sud et Asie du Sud Est. Les larves de ces deux espéces sont identiques morphologiquement et en ce qui concerne leur comportement alimentaire. L’enroulement qui consiste à coudre les deux bordures d’une feuille avant que ne commence la consommation est un comportement important des tordeuses des feuilles. L’aptitude des larves des deux espéces à enrouler les feuilles est comparée afin de déterminer si elles peuvent étre différenciées par ce caractére. Le type d’enroulement, le nombre de coûtures, le temps moyen nécessaire a la confection d’une coûture, le nombre de rotations effectuées par la larve par coûture et le comportement alimentaire pendant l’enroulement sont comparés. Les résultats de montrent que les deux espéces de tordeuses des feuilles en ont un comportement similaire.

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References

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Copyright information

© ICIPE 1993

Authors and Affiliations

  • M. L. P. Abenes
    • 1
  • Z. R. Khan
    • 1
    • 2
  1. 1.The International Centre of Insect Physiology and Ecology (ICIPE)NairobiKenya
  2. 2.International Rice Research Institute (IRRI)ManilaPhilippines

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