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Mostrando ítems 1 a 9 de 29.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 1979

    Emphasis has been placed on the screening of hybrid selections for resistance to rust, anthracnose, BCMV and Empoasca sp., yield and sensitivity to photoperiod. A total of 1464 materials (937 selections from the breeding program) were screened in the Bean Team Nursery and 700 (200 breeding selections) in the Preliminary Yield Trial. Results from the latter demonstrated major gains in yield among colored materials and a very high proportion of lines resistant to BCMV. Many lines demonstrated multiple-disease resistance.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 1979
    Colombia, América central, América del Sur

    Some cultural control measures of weeds in cassava are discussed: quality of the material, planting system and density, density x plant type interaction and use of mulching. In order to study the interaction plant type x planting density, var. M Mex 59 (vigorous) and M Col 22 (nonvigorous) were planted in plots of 7500 and 15,000 plants/ha; and 3 levels of weed control were established: complete, intermediate and no control. The vigorous var.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 1979
    Colombia, América del Sur, América central

    This audiotutorial unit (cassette, printed script, 80 color slides, study guide, self-evaluation test), prepared by the Communications Support Unit at CIAT, is available for use with a manually or automatically synchronized slide projector/cassette tape recorder. Each unitis available from the Distribution Office at a cost of US$50; photocopies of the study guide alone can be obtained from the Bean Information Center. Pests are one of the main factors limiting bean production. Of the 200 species of insects and mites, however, only a few cause losses of economic importance.

  4. Library Resource
    Informes e investigaciones
    Diciembre, 1979
    Kenya, África, África oriental

    Outlines of ranch development in various districts of Kenya w. description of geographical aspects of the districts, land use and tenure systems, human population and animal population trends, and livestock marketing activities, incl. maps showing ranch boundaries and status of land adjudication.

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