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International Journal of Tropical Insect Science

, Volume 14, Issue 1, pp 107–114 | Cite as

Nature of Resistance in Rice Varieties Against Leaffolder Cnaphalocrocis Medinalis (Guenée)

  • K. Dakshayani
  • J. S. Bentur
  • M. B. Kalode
Research Article

Abstract

Nature of resistance against the rice leaffolder, Cnaphalocrocis medinalis (Guenée) was studied in 16 rice varieties selected on the basis of greenhouse feeding test Resistant varieties as a group were less preferred for feeding by the larvae in a free choice test lasting 10 days. Cut leaf assay with limited choice brought out subtle differences among some of the test varieties In larval settling response. Larval preference was correlated positively with the leaf area damage noted In feeding test, per cent pupation and leaf width, and negatively with trichome density. However, oviposltion preference was neither distinct nor correlated with resistance or leaf morphology. An antibiosis component in the test varieties ARC 11128, Balam, Gorsa, ARC 7064 and Ptb 19 was distinctly manifested as reduced larval survival, lower pupation rate and pupal weights in comparison with the susceptible check. When neonate larvae were reared on the meridic diets containing the leaves of die varieties Darukasail, Balam or Ptb 12, antibiotic effects were much more pronounced in comparison with the larvae reared on the diet containing the leaves of the susceptible check TN 1.

Key Words

Cnaphalocrocis medinalis resistance rice varieties antixenosis antibiosis meridic diet 

Résumé

La nature de la résistance contre la chenille enrouleuse des feuilles, Cnaphalocrocis medinalis (Guenée) est étudiée sur 16 variétés de riz en conditions de serre. Les variétés résistantes constituant un groupe, étaient moins préférées pour l’alimentation par les larves en condition de libre choix sur une période de 10 jours. Des simulations portant sur la coupure des feuilles avec un choix limité apporte des différences sensibles entre les variétés dans l’établissement de la larve. La préférence larvaire était corrélée positivement avec la surface foliaire endommagée dans les tests d’alimentation, avec le pourcentage de pupaison et la largeur foliaire; elle est négativement corrélée avec la densité des trichomes. Cependant, la préférence pour l’oviposition n’était ni distincte ni corrélée avec la résistance ou la morphologie foliaire. Un composant d’antibiosis dans les variétés testées, ARC 11128, Balam, Gorsa, ARC 7064 et Ptb 19, est distingue dans la réduction de la survie larvaire, la baisse de la pupaison et du poids des pupes, en comparaison avec des témoins. Les effets antibiotiques étakntplus prononcés sur des larves neonates élevées sur des milieux artificiels à base des feuillesdes variétés Darukasail, Balam et Ptb12 par rapportàcellesélevéessurdesmllleuxàbase de feuilles de la variété sensible TN1.

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Copyright information

© ICIPE 1993

Authors and Affiliations

  • K. Dakshayani
    • 1
  • J. S. Bentur
    • 1
  • M. B. Kalode
    • 1
  1. 1.Directorate of Rice ResearchRajendranagar HyderabadIndia

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