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Distribution and disease recovery of African cassava mosaic virus (ACMV) in stems of resistance and susceptible cassava
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The base section of the ACMV-susceptible clone 60506 recorded the highest disease incidence and severity relative to all other sections of the moderately resistant clone TMS 4(2)1425 and the resistant clone TMS 30001. However, in all clones, the base section recorded higher disease than either the top or middle sections. The highest frequency of diseased nodes was recorded from the base section of clone 60506. This frequency dropped consistently from the base, through the middle, to the top sections of each clone. Disease ceased to express on plants of the resistant clone TMS 30001 but persisted throughout on those of clones TMS 4(2)1425 and 60506. In ELISA, evidence of restricted movement of virus occurred in clone TMS 30001 between nodes 1 and 10 but not in clones TMS 4(2)1425 and 60506; Cassava mosaic virus; Disease resistance; Varieties; Nigeria Manihot esculenta; Virus del mosaico de la casava; Resistencia a la enfermedad; Variedades; igeria Cassava; Yuca; Enfermedades de las plantas.