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Chilo partellos (Swinhoe) oviposition on susceptible and resistant maize genotypes

  • J. K. O. Ampofo (a1)

Abstract

The influence of resistance or susceptibility of certain maize genotypes on Chilo partellus colonization was studied. The aspects studied were: oviposition in relation to date of planting, plant age and certain morphological and biochemical characteristics. The pattern of oviposition was similar among the maize genotypes and among the different planting dates. However, the intensity of oviposition differed among the maize genotypes and also with plant age. Plants in the whorl stage of development were the most preferred for oviposition. On the whorl-stage plants, ca 92% of all the eggs were deposited on the lower leaves (1–4 from the ground). As the lower leaves senesced with plant age, the upper leaves were selected for oviposition. On all leaves, the lower surfaces were more preferred. The plant characters that appeared to influence oviposition included plant exudates (as the moth diet) and leaf surface trichomes. The quality of exudates from the different genotypes appeared to influence moth fecundity and longevity, while the trichomes appeared to influence the selection of oviposition sites. The possibility of interactions between these factors and oviposition is discussed.

L'influence de la résistance ou la susceptibilité de certains génotypes de mais à la colonisation par Chilo partellus a été étudiée. Les aspects étudies etaient: l'oviposition vis à vis la date de plantation, l'âge de la plante et certaines characteristiques morphologiques et biochimiques. Le modèle d'oviposition était semblable pour les genotypes de mais et pour les différentes dates de plantation. Cependant, l'intensité d'oviposition était différente pour les génotypes de mais ainsi que l'âge de la plante. Les plantes au stade de verticelle étaient les plus choisies pour l'oviposition. Pour les plantes au stade de verticelle, environs de 92% de tous les oeufs étaient déposés sur les feuilles inférieures (1–4 à partir du sol). Au fur et à la mesure que les feuilles inférieures vieillissaient, les plantes supérieures étaient sélectionées pour l'oviposition. Sur toutes les feuilles, les surfaces inférieures étaient choisies. Les characteristiques des plantes qui semblaient influencer l'oviposition comprenaient les exudats des plantes et les trichomes des surfaces des feuilles. La qualité des exudats provenant des différents génotypes semblait influencer la fécondité et la longévité tandis que les trichomes semblaient influencer la sélection des sites d'oviposition. La possibilité d'interaction entre ces facteurs et l'oviposition et discutée.

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References

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Keywords

Chilo partellos (Swinhoe) oviposition on susceptible and resistant maize genotypes

  • J. K. O. Ampofo (a1)

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