| Summary: | The International Bean Rust Nursery (IBRN) is in charge of testing promising Phaseolus vulgaris cv. and lines for their resistacne to rust (Uromyces phaseoli). In 1975-76 132 bean lines were tested, among which there were 28 potential rust-race differentials. In 1977-78, 26 trials were planted with the help of 20 collaborators in 22 locations of L.A., U.S.A., Europe, Africa and Australia. Rust incidence was evaluated 20-40 days after planting and 40-60 days after germination, according to the intensity of infection and type of pustule that can be found at any of the 5 stages of development. The final classification of the plant`s reactions to each material at the different sites is given in table form. Var. Cocacho (4), Cuilapa 72 (26), Redlands Pioneer (28), Redlands Greenleaf B (44), Redlands Greenleaf C (46) and Puebla 87 (88) did not show susceptibility at any of the locations. (AS)
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