, Volume 155, Issue 3, pp 337–348 | Cite as

Characterization of resistance of cassava genotypes to bacterial blight by evaluation of leaf and systemic symptoms in relation to yield in different ecozones

  • Kerstin Wydra
  • Agnassim Banito
  • Kossi Esotina Kpémoua


Twenty-two improved and local cassava genotypes were evaluated for their bacterial blight symptom types in reaction to infection by Xanthomonas axonopodis pv. manihotis under field conditions in the forest, forest savanna transition and wet savanna zones of Togo. High genotype × environment interactions in development of each symptom type were observed. Combining data on environments and genotypes, spot, blight and wilt symptoms were positively correlated. Analysing genotype reactions across environments, indications for independent mechanisms of resistance on leaf and stem level, varying by genotype, were found. Genotypes Main27 with resistance to spot and blight symptoms and TMS4(2)1425 with resistance to wilt symptoms are recommended to breeders to introgress their resistance characteristics. Significant negative correlations were generally observed between blight and wilt symptom development and root yield across ecozones, with blight being more important under lower, and wilt under higher inoculum pressure. Genotypes TMS30572, CVTM4, TMS92/0429 and TMS91/02316 showed low spot, blight and wilt symptoms combined with high root yield across ecozones.


Manihot esculenta Xanthomonas axonopodis pv. manihotis Togo 



This study was funded by the European Union, INCO-DC programme, Contract Number IC18-CT-1998–0306. We thank the International Institute of Tropical Agriculture, Station Cotonou, Benin, and the Institut Togolais de Recherche Agronomique, Lomé, Togo, for logistic support in field and laboratory trials.


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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Kerstin Wydra
    • 1
  • Agnassim Banito
    • 1
    • 2
    • 3
  • Kossi Esotina Kpémoua
    • 2
  1. 1.Institute of Plant Diseases and Plant ProtectionGottfried Wilhelm Leibniz University HannoverHannoverGermany
  2. 2.Institut Togolais de Recherche Agronomique (ITRA), CacavéliLoméTogo
  3. 3.Ecole Supérieure d’Agronomie (ESA), Université de LoméLoméTogo

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