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Antixenosis component of resistance to corn planthopper, Peregrinus maidis (Ashmead) in sorghum

Published online by Cambridge University Press:  19 September 2011

B. M. Chandra Shekar ,
K. D. Reddy ,
B. U. Singh  and
D. D. R. Reddy
B. M. Chandra Shekar
Affiliation:
Department of Entomology, College of Agriculture, Andhra Pradesh Agricultural University
K. D. Reddy
Affiliation:
Department of Entomology, College of Agriculture, Andhra Pradesh Agricultural University
B. U. Singh*
Affiliation:
Department of Entomology, College of Agriculture, Andhra Pradesh Agricultural University
D. D. R. Reddy
Affiliation:
Department of Entomology, College of Agriculture, Andhra Pradesh Agricultural University
*
* Address for correspondence: National Research Centre for Sorghum, Rajendranagar, Hyderabad 500 030 (AP), India.
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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 postrainy seasons) conditions. In a free-choice test, the orientationa) and settling responses of nymphs and brachypterous adults on all genotypes although influenced by the olfactory and visual responses, then- feeding was notsustained due to gustatory stimuli indicating their significant role in determining the degreeof antlxenosis. The genotypes IS 18676, IS 19349 and IS 18677 showed a high degree of antixenosls 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.

Résumé

L'antixenosis, composante dans la résistance du mai's vis À vis de ia clcadelle, 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 seche). Dans les tests de libre choix, les réponses dans l'orientation et I'établissement des nymphes et adultes ailés sur les plantes, peuvent être influencée par les réponses olfactive et vlsuelle; cependant la prise de nourriture nétait pas soutenue par des stimuli gustatifs indiquant un rôle significatif dans les dégrés d'antixenosis. Les génotypesis 18676, IS 19349, IS 18677 ont montré des degrés élevés d'antixenosis dans I'établissement de très peu de nymphes et d'adultes à 30,45 et 60jours 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 pourla 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 SPV472 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 dégres variables d'antixenosispour l'oviposition.

Keywords

Antixenosiscorn planthopperorientational responseovipositionPeregrinus maidissorghum
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 1 , February 1993 , pp. 77 - 84
Copyright
Copyright © ICIPE 1993

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