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Antixenosis Component of Resistance to Corn Planthopper, Peregrinus Maidis (Ashmead) in Sorghum

  • B. M. Chandra Shekar
  • K. D. Reddy
  • B. U. Singh
  • D. D. R. Reddy
Research Article

Abstract

Antixenosis component of resistance to corn planthopper, Peregrinus maidis (Ashm.) was investigated in 10 selected sorghum genotypes at three plant growth stages (30, 45 and 60 DAG) under laboratory and field (rainy and postralny seasons) conditions. In a free-choice test, the orientational and settling responses of nymphs and brachypterous adults on ail genotypes although influenced by the olfactory and visual responses, their feeding was not sustained due to gustatory stimuli indicating their significant role in determining the degree of antixenosis. The genotypes IS 18676, IS 19349 and IS 18677 showed a high degree of antixenosis in settling fewer nymphs and adults consistently at 30, 45 and 60 DAG. This finding was supported with low colonization of nymphs, and brachypterous and macropterous adults under field conditions. In addition, high degree of antixenosis for oviposition in both laboratory and field tests was evidenced on IS 18676 and IS 19349 at 30, 45 and 60 DAG, but on SPV 472 and SPV 475 only at specific plant growth stages. The variability in the rate of adult colonization together with suitability of plant growth stages for oviposition has contributed to variable degrees of antixenosis for oviposition.

Key Words

Antixenosis corn planthopper orientational response oviposition Peregrinus maidis sorghum 

Résumé

L’antixenosis, composante dans la résistance du maïs vis à vis de la cicadelle, Peregrinus maïdis est évaluée sur 10 génotypes de sorgho sélectionées, à trois stades de développement de la plante (30, 45 et 60 jours après levée) en conditions de laboratoire et de champs (saisons pluvieuse et sèche). Dans les tests de libre choix, les réponses dans l’orientation et l’établissement des nymphes et adultes ailés sur les plantes, peuvent être influencée par les réponses olfactive et visuelle; cependant la prise de nourriture n’était pas soutenue par des stimuli gustatifs indiquant un rôle significatif dans les dégrés d’antixenosis. Les génotypes IS 18676, IS 19349, IS 18677 ont montré des degrés élevés d’antixenosis dans l’établissement de très peu de nymphes et d’adultes à 30, 45 et 60 jours après levée. Ces résulats sont en harmonie avec la faible colonisation des nymphes, des brachyptères et macroptères en condition naturelle. En plus, un degré élevé d’antixenosis pour la ponte en conditions naturelle et de laboratoire est établi sur les variétés IS 18676 et IS 19349 à 30, 45 et 60 jours après levée, mais à des stades spécifiques de développement sur SPV 472 et SPV 475. La variabilité dans le taux de colonisation combinée avec la convenance de certains stades de développement pour la ponte ont contribué à des dégrés variables d’antixenosis pour l’oviposition.

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Copyright information

© ICIPE 1993

Authors and Affiliations

  • B. M. Chandra Shekar
    • 1
  • K. D. Reddy
    • 1
  • B. U. Singh
    • 1
  • D. D. R. Reddy
    • 1
  1. 1.Department of EntomologyCollege of Agriculture Andhra Pradesh Agricultural UniversityIndia

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