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The aim of this study was to identify plants of the IAPAR-59 and Tupi IAC 1669-33 coffee cultivars with less defeated resistance genes by the rust races present at IAPAR (Londrina, Paraná State, Brazil) using test-crosses. Eighteen test-crosses derived from hybridizations between 'IAPAR-59' or 'Tupi IAC 1669-33' with susceptible coffee to the rust disease were evaluated. Six hybrids were used as susceptible standards originated from hybridizations between two susceptible coffee plants. Many parental plants of the 'IAPAR-59' and 'Tupi IAC 1669-33' presented more defeated resistance genes against rust races present at IAPAR than others of these cultivars or the genes were in heterozygous, because of segregant susceptible plants observed in some test-crosses. The test-crosses were very efficient to identify plants with less defeated resistance genes to the H. vastatrix. Coffee plants considered resistants would must be made test-crosses to verify which plants presented less and/or more defeated genes in homozygous. A ferrugem é uma das principais doenças do café. O objetivo deste trabalho foi identificar plantas das cultivares IAPAR-59 e Tupi IAC 1669-33 com menos genes de resistência quebrados às raças de ferrugem presentes no IAPAR (Londrina, Paraná, Brasil) através de cruzamentos testes. Foram avaliados 18 cruzamentos testes derivados dos cruzamentos de 'IAPAR-59' ou 'Tupi IAC 1669-33' com cafeeiros suscetíveis à ferrugem. Seis híbridos foram usados como testemunhas suscetíveis derivados do cruzamento de dois cafeeiros suscetíveis. Muitas plantas da 'IAPAR-59' e 'Tupi IAC 1669-33' apresentam mais genes de resistência quebrados pelas raças de ferrugem presentes no IAPAR do que outras dessas cultivares ou os genes estão em heterozigoze, pois foram observadas muitas plantas segregantes suscetíveis em alguns cruzamentos testes. Os cruzamentos testes são muito eficientes para selecionar plantas com menos genes de resistência à ferrugem quebrados. Em cafeeiros de cultivares considerados resistentes deveriam ser feitos cruzamentos testes para verificar quais plantas apresentam menos genes de resistência quebrados ou mais genes em homozigoze

Selection for durable resistance to leaf rust using test-crosses on IAPAR-59 and Tupi IAC 1669-33 cultivars of Coffea arabica