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EnglishThe aim of this study was to evaluate the occurrence and intensity of leaf diseases and crop cycle in six soybean cultivars in Passo Fundo, RS, Brazil, during two times of sowing in 2007-08 season. Cultivars A 4910 RG, BMX Apolo RR, A 6001 RR, CD 214 RR, FUNDACEP 55 RR and CD 219 RR were used, because they represent large area of cultivation in Brazilian state. The intensity of leaf diseases present in the aerial part of crop was evaluated weekly in a period of five weeks. Severity values (except cercospora blight and soybean rust) were integrated in the area under the relative disease progress curve (AUDPCr). A randomized complete block (RCBD) design with six treatments and four replications was used, and the data obtained were submitted to variance analysis. Subsequently, a comparison of media by Tukey (p?0.05) was carried out for each season, and for the comparison between the seasons test T (p?0.05) was used. Cultivars A 4910 RG and BMX Apolo RR had lower severity of downy mildew and blight cercospora, as well as of the number of lesions cm-2 of Asian rust. Cultivars CD 219 RR and FUNDACEP 55 RR showed less bacterial blight, downy mildew and powdery mildew severity. Genotype A 4910 RG behaved as very early, BMX Apolo RR, A 6001 RR and CD 214 RR as precocious, FUNDACEP RR 55 as medium and CD 219 RR as late. portuguesO objetivo do trabalho foi avaliar a ocorrencia e intensidade de doencas foliares e a duracao do ciclo de cultivo de seis cultivares de soja em Passo Fundo, RS, Brasil, durante duas epocas de semeadura na safra agricola de 2007-08. Utilizaram-se os cultivares A 4910 RG, BMX Apolo RR, A 6001 RR, CD 214 RR, FUNDACEP 55 RR e CD 219 RR, escolhidas por representarem grande area de cultivo no estado brasileiro. Avaliou-se semanalmente a intensidade de doencas presentes na parte aerea da cultura, totalizando cinco semanas. Os valores de severidade (exceto crestamento de cercospora e ferrugem asiatica) foram integralizados na area abaixo da curva de progresso da doenca relativa (AACPDr). O delineamento experimental foi de blocos completos ao acaso (DBCA), com quatro repeticoes, sendo os dados obtidos submetidos a analise de variância. Posteriormente, realizou-se uma comparacao das medias pelo teste de Tukey (p?0.05) para cada epoca, e para a comparacao entre as medias das epocas a prova de T (p?0.05). Os cultivares A 4910 RG e BMX Apolo RR obtiveram menor severidade de mildio e crestamento foliar de cercospora, assim como de numero de lesoes cm-2 da ferrugem asiatica. Os cultivares CD 219 RR e FUNDACEP 55 RR mostraram menor severidade de crestamento bacteriano, mildio e oidio. Durante esta safra o genotipo A 4910 RG se comportou como superprecoce, os BMX Apolo RR, A 6001 RR e CD 214 RR como precoces, FUNDACEP 55 RR como medio e CD 219 RR como tardio..

OCORRÊNCIA E INTENSIDADE DE DOENÇAS FOLIARES E CICLO DE CULTIVO EM SEIS CULTIVARES DE SOJA DURANTE DUAS ÉPOCAS DE SEMEADURA