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Gabriel, C.J. ,  WALSH, R. ,  Nolt, Barry L. ,  [Evidence for a latent viruslike agent in cassava] ,  Evidence for a latent viruslike agent in cassava

Nolt, Barry L. ,  Pineda López, Benjamín ,  Velasco, Ana Cecilia ,  [Surveys of cassava plantations in Colombia for virus and virus- like diseases] ,  Surveys of cassava plantations in Colombia for virus and virus- like diseases

Nolt, Barry L. ,  Velasco, Ana Cecilia ,  Pineda López, Benjamín ,  [Improved purification procedure and some serological and physical properties of cassava common mosaic virus from South America] ,  Improved purification procedure and some serological and physical properties of cassava common mosaic virus from South America

Gabriel, C.J. ,  Walsh, R ,  Nolt, Barry L. ,  [Postharvest root deterioration or vascular streaking of cassava clones (accessions and breeding lines) was evaluated with harvests at different ages (8 and 12 mo.), seasons (beginning and end of wet season), and locations (CIAT-Palmira, Carimagua, and Caribia in Colombia) to assess the effect of environmental factors on cassava genotypes. Vascular streaking was sensitive to any of these environmental factors. Genotype x location interaction was highly significant suggesting that final cv. selection should be carried out in each location. Genetic analysis carried out in one location suggested that inheritance of vascular streaking was, at least partly, controlled by additive factors and was quantitative rather than qualitative. Narrow sense heritability of 0.64 was obtained. Vascular streaking was highly and significantly correlated with root DM content in all the trials conducted during 7 yr. Since free recombination between resistance to vascular streaking and high root DM content may not be possible, the most acceptable balance between these 2 traits should be defined according to the use of product and edaphoclimatic condition of production area prior to selection program. (AS)] ,  Postharvest root deterioration or vascular streaking of cassava clones (accessions and breeding lines) was evaluated with harvests at different ages (8 and 12 mo.), seasons (beginning and end of wet season), and locations (CIAT-Palmira, Carimagua, and Caribia in Colombia) to assess the effect of environmental factors on cassava genotypes. Vascular streaking was sensitive to any of these environmental factors. Genotype x location interaction was highly significant suggesting that final cv. selection should be carried out in each location. Genetic analysis carried out in one location suggested that inheritance of vascular streaking was, at least partly, controlled by additive factors and was quantitative rather than qualitative. Narrow sense heritability of 0.64 was obtained. Vascular streaking was highly and significantly correlated with root DM content in all the trials conducted during 7 yr. Since free recombination between resistance to vascular streaking and high root DM content may not be possible, the most acceptable balance between these 2 traits should be defined according to the use of product and edaphoclimatic condition of production area prior to selection program. (AS)

Roca, William M. ,  Nolt, Barry L. ,  Mafla, G. ,  Roa E, J.C. ,  Reyes, R. ,  [Eliminacion de virus y propagacion de clones en la yuca (Manihot esculenta Crantz)] ,  Eliminacion de virus y propagacion de clones en la yuca (Manihot esculenta Crantz)