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    Field evaluation of root rot disease and relationship between disease severity and yield in cassava

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    S05ArtFieldOnyeka.pdf (78.80Kb)
    Date
    2005-07
    Author
    Onyeka, T.J.
    Dixon, Alfred G.O.
    Ekpo, E.J.A.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    eports of cassava root rot disease from different African countries have increased in recent times. Field studies were conducted from July 1998 to October 1999 to determine a reproducible disease assessment method that would allow the comparison of results from different locations and an evaluation of the relationship between disease severity and root yield. Single point disease assessments at 6, 9, 12 and 15 months after planting (MAP) were compared to multiple points assessment based on the area under a disease progress curve (AUDPC). Single point assessments at 12 and 15 MAP, and the AUDPC identified continuous variation (p≤0.01) among the genotypes. However, a consistent result across trials was obtained only with the assessment based on AUDPC. Root dry yield (DYLD) at 15 MAP showed a strong negative correlation with AUDPC (r=−0.74). Regression analysis also confirmed the negative relationship between yield and root rot severity. The five genotypes compared were separated into resistant (91/02324, 30572 and 92/0427) and susceptible (92/0057 and TME-1) groups. It was concluded that root rot disease may cause significant yield loss; however, the magnitude of the yield loss will depend on the susceptibility of the cassava genotype.
    https://dx.doi.org/10.1017/S0014479705002668
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5184
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1017/S0014479705002668
    IITA Subjects
    Cassava; Food Security; Plant Diseases
    Agrovoc Terms
    Cassava; Root Rots; Food Security; Diseases; Nigeria; West Africa; Yield Losses
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Experimental Agriculture
    Collections
    • Journal and Journal Articles4835
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