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EnglishAsian soybean rust is an important disease that has deeply troubled farmers and researchers since it was first reported. The causal agent, biotrophic fungus Phakopsora pachyrhizi Sydow & P. Sydow, has found extremely favorable conditions for its dissemination in Brazil. The most characteristic symptom of infection appears in the leaves, initially on the adaxial leaf surface, as small angular points less than 1mm in diameter, together with gray-colored uredospores (spores). Management involves a set of practices that guarantee coexistence between the plant and the pathogen without significant damage to the crop. The objective of this research was to evaluate tolerance to Asian rust by estimating losses caused by natural infection in the field. Experiments with generation F4 (2014/15) plants were established in a randomized blocks design with four replicates, with two types of genotypes (crosses and parents) and two schemes for disease management using fungicides. For analysis of the data, a test was applied on two dependent samples to verify the significance of the estimate of the rust effect. With regard to grain yield and tolerance, the most outstanding crosses were 104 (USP14-01-20 × EMGOPA313) and 149 (USP93-05.552 × EMGOPA313). Crosses 147 (USP93-05552 × PI153.282) and 137 (USP70.108 × PI153.282) were graded as tolerant in the evaluation of both yield reduction and seed size. We found evidence of tolerance to Asian rust in both crosses and parents. The statistical test revealed the significance of the rust effect estimates in soybean. Key words: Glycine max; Phakopsora pachyrhizi; partial diallel; paired t-test; rust managements with fungicides. portuguesA ferrugem asiatica da soja e a doenca que mais tem preocupado os produtores e pesquisadores desde sua primeira evidencia. Ela e causada pelo fungo biotrofico Phakopsora pachyrhizi Sydow & P. Sydow que encontrou condicoes extremamente favoraveis para a sua disseminacao no Brasil. O sintoma mais caracteristico apresenta-se nas folhas, inicialmente na face adaxial, como pequenos pontos angulares com menos de um milimetro de diâmetro, juntamente com os uredosporos (esporos) de coloracao acinzentada. O manejo se da por meio de um conjunto de praticas que garanta a boa convivencia entre a planta e o patogeno e sem que ocorra danos significativos a lavoura. O trabalho objetivou avaliar a tolerância a ferrugem asiatica estimando as perdas causadas pela infestacao natural a campo. Os experimentos com a geracao F4 (2014/15) foram delineados em blocos ao acaso com quatro repeticoes. Foram realizadas categorias de experimentos, envolvendo dois tipos de genotipos (cruzamentos e genitores) e dois tipos de manejos de doencas com fungicidas. Para a analise dos dados foi aplicado um teste, para duas amostras dependentes, a fim de verificar a significância da estimativa do efeito ferrugem. Considerando a produtividade e a tolerância, os cruzamentos mais importantes foram 104 (USP 14-01-20 x EMGOPA 313) e 149 (USP 93-05.552 x EMGOPA 313). Os cruzamentos 147 (USP 93-05.552 x PI 153.282) e 137 (USP 70.108 x PI 153.282) foram tolerantes tanto na avaliacao de reducao da produtividade e do tamanho de semente. Houveram evidencias de tolerância a ferrugem asiatica nos cruzamentos e nos genitores. O teste estatistico revelou a significância das estimativas de efeito ferrugem em soja. Palavras-chave: Glycine max; Phakopsora pachyrhizi; dialelo parcial; teste t pareado; manejo da ferrugem com fungicidas

Rust effect estimation in soybean crosses for tolerance to Asian rust