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RESEARCH ARTICLE
Contents Vol 58(6)

The situation of common wheat rusts in the Southern Cone of America and perspectives for control

Silvia Germán A , Amarilis Barcellos B , Marcia Chaves C , Mohan Kohli D , Pablo Campos E and Lidia de Viedma F
+ Author Affiliations
- Author Affiliations

A Corresponding author; INIA La Estanzuela, CC 39173, Colonia, CP 70000, Uruguay. Email: sgerman@inia.org.uy

B OR Melhoramento de Sementes Ltda., Rua João Battisti 71, Passo Fundo, CP 99050-380, RS, Brazil.

C EMBRAPA Trigo, Rodovia BR 285, km 174, Passo Fundo, CP 99001-970, RS, Brazil.

D CAPECO, Av. Brasilia 840, Asunción, Paraguay.

E INTA Bordenave, CC 44, Bordenave, CP 8187, Argentina.

F MAG/DIA/CRIA, Ruta VI, km 16, Capital Miranda, Itapúa, Paraguay.

Australian Journal of Agricultural Research 58(6) 620-630 https://doi.org/10.1071/AR06149
Submitted: 10 May 2006  Accepted: 16 October 2006   Published: 26 June 2007

Abstract

Approximately 9 million ha of wheat (Triticum aestivum and T. durum) is sown in the Southern Cone of America (Argentina, Brazil, Chile, Paraguay, and Uruguay). Two rust epidemiological zones separated by the Andean mountain range have been described in the region. Presently, leaf rust (caused by Puccinia triticina) is the most important rust disease of wheat. The utilisation of susceptible or moderately susceptible cultivars in a high proportion of the wheat area allows the pathogen to oversummer across large areas, resulting in early onset of the epidemics. Severe epidemics cause important economic losses if chemical control is not used. The pathogen population is extremely dynamic, leading to transitory resistance in commercial cultivars. Lr34 is commonly present in the regional germplasm, but there is limited knowledge about the presence of other genes conferring resistance in cultivars. Genes Lr28, Lr36, Lr38, Lr41, and Lr43 provide effective resistance in the region. The best strategy for the stabilisation of the pathogen population and resistance is considered to be the use of adult plant resistance conferred by minor additive genes including Lr34 and Lr46. Sources of this type of resistance from CIMMYT and the region have been made available to breeding programs in the Southern Cone. Stripe rust (P. striiformis f. sp. tritici) is endemic in Chile where chemical control is required to prevent severe losses in stripe rust susceptible cultivars. Although new virulent races emerge frequently, resistance genes Yr5, Yr8, Yr10, Yr15, and YrSp are currently effective in Chile. Some important stripe rust epidemics have occurred in Argentina, Brazil, and Uruguay. Avoiding the use of highly susceptible cultivars appears to be an effective strategy to prevent stripe rust epidemic development in this area. There have been no serious stem rust (P. graminis f. sp. tritici) epidemics for over 2 decades; the disease was controlled by resistant cultivars. The most important genes conferring resistance in Southern Cone germplasm at the present time are probably Sr24 and Sr31. Other effective genes are Sr22, Sr25, Sr26, Sr32, Sr33, Sr35, Sr39, and Sr40. Several stem rust susceptible wheat cultivars have recently been released. The increased cultivation of susceptible cultivars may lead to higher stem rust incidence, increasing the probability of appearance of new virulent races. Since the 1BL.1RS translocation possessing Sr31 is present in a high proportion of the regional germplasm, the possible introduction of stem rust with Sr31 virulence from Africa is of great concern.

Additional keywords: Triticum aestivum, Puccinia triticina, Puccinia striiformis f. sp. tritici, Puccinia graminis f. sp. tritici, pathogen variability, resistance.


Acknowledgments

We appreciate the contribution of Dr Ricardo Madariaga, INIA-Chile, and Dr Robert McIntosh, University of Sydney, for reviewing the paper. Much of the information from 1999–2004 was obtained during the execution of a project funded by USDA. Funding of the attendance of the main author to the conference ‘Global Landscapes in Cereal Rust Control’ (September 2005) by GRDC is greatly appreciated.


References


Aguayo L (1983) Mejoramiento de trigos invernales y primaverales en la zona centro-sur de Chile. In ‘Reunião de Melhoristas de Trigo do Cone Sul’. EMBRAPA-CNPT, Passo Fundo, RS. (Coord. O de S Rosa) pp. 91–100. Diálogo No. 9. (Programa Cooperativo de Pesquisa Agricola: Montevideo)

Andrade Vilaro O (1990) Polvillo estriado o roya amarilla (Puccinia striiformis Westend) del trigo en la zona sur de Chile. Instituto de Investigaciones Agropecuarias, Estación Experimental Carillanca, Boletín Técnico No. 164, Temuco.

Antonelli EF (1969) Fuentes de germoplasma de resistencia a enfermedades y plagas. In ‘Simposio del trigo’. Buenos Aires. pp. 332–351. (Academia Nacional de Agronomía y Veterinaria: Buenos Aires)

Antonelli EF (1982) Especializacion fisiológica de Puccinia recondita tritici y P. graminis tritici en la Argentina en el período 1978–1981. In ‘Reunión de Especialistas en Royas del Trigo, Cono Sur de América’. INTA Castelar, Argentina. [s.p.]. (Programa IICA-Cono Sur/BID)

Antonelli EF (1983) Principales patógenos que afectan la producción de trigo en la Argentina. In ‘Simposio sobre Fitomejoramiento y Producción de Cereales’. INTA/CIMMYT Marcos Juárez, Córdoba. [s.p.]. (Agencia Estadounidense para el Desarrollo Internacional, Universidad Estatal de Oregon)

Antonelli EF (1986) Especialización fisiológica de Puccinia recondita tritici y P. graminis tritici en la Argentina en el período 1982–1984. In ‘Reunião de Especialistas em Ferrugens de Cereais de Inverno’. CNPT/EMBRAPA, Passo Fundo, RS. (Ed. CJ Molestina) pp. 37–39. Diálogo No. 13. (PROCISUR: Montevideo)

Antonelli EF (1994) Resistencia en plántula y planta adulta de cultivares comerciales argentinos de trigo y progenitores (antecesores) tradicionales. In ‘Interacción hospedante-patógeno en hongos biotrofos. Informe correspondiente al año 1993. [s.p.]. (Instituto de Genética E.A. Favret: Castelar)

Antonelli EF (2000) La roya negra del tallo (Puccinia graminis f. sp. tritici). Una ilustre ausente de los campos de trigo. ¿Por cuánto tiempo más? (Grafos: Necochea, Argentina)

Antonelli EF (2003) La roya anaranjada (Puccinia triticina Erikss.). Sobre la efímera resistencia observada en la última década en cultivares comerciales de trigo de amplia difusión en la Argentina. (Grafos: Necochea, Argentina)

Barcellos AL (1982) As ferrugens do trigo no Brasil. In ‘Trigo no Brasil’. (Coord. EA Osório) pp. 377–419. (Fundacão Cargill: Campinas)

Barcellos AL (1986) Ferrugem da folha do trigo no Brasil. População patogênica, fontes de resistência, trigos comerciais, perpetuação e controle químico. In ‘Reunião de Especialistas em Ferrugens de Cereais de Inverno’. CNPT/EMBRAPA, Passo Fundo, RS. (Ed. CJ Molestina) pp. 72–87. Diálogo No. 13. (PROCISUR: Montevideo)

Barcellos AL (1991) Durable leaf rust resistance in wheat in Brazil. In ‘Wheat for the non-traditional warm areas’. (Ed. D Saunders) pp. 462–465. (CIMMYT: México DF)

Barcellos AL (2000) Urgent need for less ephemeral resistance to leaf rust in Brazilian wheat cultivars. In ‘6th International Wheat Conference’. Agricultural Research Institute of the Hungarian Academy of Sciences, Martonvásár, Hungary.

Barcellos AL , Aita L (1982) Síntese dos resultados das pesquisas sobre ferrugem da folha do trigo realizadas no CNPT-EMBRPA, Passo Fundo, RS, Brasil, de 1980 a 1982. In ‘Reunión de Especialistas en Royas del Trigo, Cono Sur de América’. INTA Castelar, Argentina. [s. p.]. (Programa IICA-Cono Sur/BID)

Barcellos AL , Aita L , Coehlo ET (1982) Informações preliminares sobre fonte de inóculo de ferrugem da folha e do colmo do trigo em Passo Fundo. In ‘Reunión de Especialistas en Royas del Trigo, Cono Sur de América’. INTA Castelar, Argentina. [s. p.]. (Programa IICA-Cono Sur/BID)

Barcellos AL , Kohli MM (2003) Resultados da XIa, XIIa, XIIIa, e XIVa coleção para avaliação e coleta de ferrugem do colmo e ferrugem da folha do trigo 1998–2001. EMBRAPA Trigo/CIMMYT, Documentos no. 37, Passo Fundo.

Barcellos AL, Roelfs AP, de Moraes-Fernandes MIB (2000) Inheritance of adult plant leaf rust resistance in the Brazilian wheat cultivar Toropi. Plant Disease 84, 90–93.
| Crossref |
open url image1

Barcellos AL , Turra C (2004) Search for durable resistance to wheat leaf rust in Brazil. In ‘Abstracts [of the] 11th International Cereal Rusts and Powdery Mildews Conference’. John Innes Centre, Norwich, England, UK. p. A2.3.

Barcellos AL , Turra C (2005) Partial resistance – best approach for control of wheat leaf rust in environments favorable for the disease. In ‘Wheat production in stressed environments: abstracts of oral and poster presentations [of the] 7th International Wheat Conference’. Mar del Plata, Argentina. pp. 125. (Secretariat of Agriculture, Animal Husbandry, Fisheries and Food)

Beckmann I (1940) El problema del trigo en el Brasil. Revista de la Facultad de Agronomía, (Montevideo) 19, 21–36.

Betucci L , Ferreira V , Szpiniak B (1971) Razas fisiológicas de Puccinia graminis tritici y Puccinia recondita tritici presentes en el Uruguay en 1968. Universidad de la República, Boletín No. 117, Montevideo.

van Beuningen LT , Kohli MM (1986) Results from the observations on the Latin American Rust Nursery (ELAR 1981–1983). In ‘Reunião de Especialistas em Ferrugens de Cereais de Inverno’. CNPT/EMBRAPA, Passo Fundo, RS. (Ed. CJ Molestina) pp. 7–20. Diálogo No. 13. (PROCISUR: Montevideo)

Boasso CS, Levine MN (1951) Leaf rust of wheat, Puccinia rubigovera tritici, in Uruguay. Phytopathology 41, 736–741. open url image1

Boerger A (1934) Consideraciones restropectivas acerca de la primera aparición epidémica de la roya amarilla (Puccinia glumarum (Schm) Erikss. et Henn.) en el Río de la Plata. Revista del Ministerio de Industrias (Montevideo) 1, 5–16. open url image1

Brammer SP, Fernandes MIB, Barcellos AL, Milach SCK (2004) Genetic analysis of adult-plant resistance to leaf rust in a double haploid wheat (Triticum aestivum L. em Thell) population. Genetics and Molecular Biology 27, 432–436.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Brammer SP , Worland A , Barcellos AL , Fernandez MIB (1998) Monosomic analysis of adult-plant resistance to leaf rust in the Brazilian wheat cultivar ´Toropí´. In ‘Proceedings 9th International Wheat Genetics Symposium’. Saskatoon, Saskatchewan. (Ed. AE Slinkard) v.2, pp. 17–18. (University of Saskatchewan)

Campos PE , López JR , Brach AM (2005) Characterization of population of Puccinia triticina in Argentina in 2003 and 2004. In ‘Wheat production in stressed environments: Abstracts of oral and poster presentations of the 7th International Wheat Conference’. Mar del Plata, Argentina. p. 129. (Secretariat of Agriculture, Animal Husbandry, Fisheries and Food)

Chaves MS , Barcellos AL , Germán S , Scheeren PL , Del Duca L de JA Silva M Só e, Caierão E (2005) Population dynamics of Puccinia triticina in the South Cone region of South America. In ‘Wheat production in stressed environments: Abstracts of oral and poster presentations [of the] 7th International Wheat Conference’. Mar del Plata, Argentina. p. 130. (Secretariat of Agriculture, Animal Husbandry, Fisheries and Food)

Coelho ET (1980) Distritribução, prevalencia de novas razas fisiologicas de Puccinia graminis tritici (ferrugem do colmo do trigo) no Brasil de 1974 a 1978. In ‘XI Reunião Nacional de Pesquisa de Trigo’. Porto Alegre, RS, Brasil. v. 2, pp. 9–22. (EMBRAPA Centro Nacional de Pesquisa de Trigo: Passo Fundo)

Coelho E (1982) Síntese dos resultados das pesquisas sobre ferrugem do colmo do trigo realizadas no Centro Nacional de Pesquisa de Trigo (CNPT) EMBRAPA, Passo Fundo, RS, Brasil 1980 e 1981. In ‘Reunión de Especialistas en Royas del Trigo, Cono Sur de América’. INTA Castelar, Argentina. [s.p.]. (Programa IICA-Cono Sur/BID)

Coelho E (1986) Síntese dos estudos com ferrugem do colmo do trigo -1982 a 1984. In ‘Reunião de Especialistas em Ferrugens de Cereais de Inverno’. CNPT/EMBRAPA, Passo Fundo, RS. (Ed. CJ Molestina) pp. 107–110. Diálogo No. 13. (PROCISUR: Montevideo)

Dyck PL (1989) The inheritance of leaf rust resistance in wheat cultivars Kenyon and B. Manantial. Canadian Journal of Plant Science 69, 1113–1117. open url image1

Dyck PL (1991) Genetics of adult plant leaf rust resistance in Chinese Spring and Sturdy wheats. Crop Science 24, 309–311. open url image1

Dyck PL, Kerber ER (1977) Inheritance of leaf rust resistance in wheat cultivars Rafaela and EAP 26127 and chromosome location of Lr17. Canadian Journal of Genetics and Cytology 19, 355–358. open url image1

Dyck PL, Samborski DL (1968a) Genetics of resistance to leaf rust in the common wheat varieties Webster, Loros, Brevit, Carina, Malakoff and Centenario. Canadian Journal of Genetics and Cytology 10, 7–17. open url image1

Dyck PL , Samborski DL (1968 b) Host-parasite interactions involving two genes for leaf rust resistance in wheat. In ‘Proceedings of the Third International Wheat Genetics Symposium’. Canberra, Australia (Eds KW Finlay, KW Shepherd) pp. 245–250. (Australian Academy of Science: Canberra)

Dyck PL, Samborski DL (1970) The genetics of two alleles for leaf rust resistance at the Lr14 locus in wheat. Canadian Journal of Genetics and Cytology 12, 689–694. open url image1

Dyck PL, Samborski DL (1982) The inheritance of resistance to Puccinia recondita in a group of common wheat cultivars. Canadian Journal of Genetics and Cytology 24, 273–283. open url image1

Dyck PL, Samborski DL, Anderson RG (1966) Inheritance of adult plant-leaf rust resistance derived from the common wheat varieties Exchange and Frontana. Canadian Journal of Genetics and Cytology 8, 665–671. open url image1

FAOSTAT (2006) Core production data (online). (FAO: Rome). Available at: http://faostat.fao.org/site/340/default.aspx. Verified: July 2006.

Germán S , Caffarel JC (1999) Roya estriada de trigo. In ‘Jornada de Cultivos de Invierno’. INIA La Estanzuela, Colonia, Uruguay. pp. 25–32. Serie Actividades de Difusión No. 188, La Estanzuela.

Germán S , Díaz M , Verges R , Castro M (2005) Breeding for resistance to wheat rusts in a highly favourable environment for diseases. In ‘Wheat production in stressed environments: Abstracts of oral and poster presentations [of the] 7th International Wheat Conference’. Mar del Plata, Argentina. pp. 139. (Secretariat of Agriculture, Animal Husbandry, Fisheries and Food)

Germán S , Kohli M , Chaves M , Barcellos A , Nisi J , Annone J , Madariaga R , de Viedma L (2004) Breakdown of resistance of wheat cultivars and estimated losses caused by recent changes in the leaf rust population in South America. In ‘Abstracts [of the] 11th International Cereal Rusts and Powdery Mildews Conference’. John Innes Centre, Norwich, England, UK. pp. A2.21.

Germán S , Kolmer JA (1996) Genetics of leaf rust resistance in selected Uruguayan wheat cultivars. In ‘Proceedings of the 9th European and Mediterranean Cereal Rusts & Powdery Mildews Conference’. Lunteren, The Netherlands. (Eds GHJ Kema, RE Niks, RA Daamen). Cereal Rusts and Powdery Mildews Bulletin 24, 235.

Germán SE, Abadie T, Perea C (1986) Epifitia de roya de la hoja sobre el cultivar de trigo La Paz INTA. Investigaciones Agronómicas (Montevideo) 7, 75–77. open url image1

Germán SE, Kolmer JA (1994) Virulence phenotypes of Puccinia recondita f. sp. tritici in Uruguay. Plant Disease 78, 1139–1141. open url image1

Hacke E (1986) Investigación en polvillos (o royas) del trigo realizadas en Chile en las temporadas 1982–83 a 1984–85. In ‘Reunião de Especialistas em Ferrugens de Cereais de Inverno’. CNPT/EMBRAPA, Passo Fundo, RS. Diálogo No. 13. (Ed. CJ Molestina) pp. 137–152. (PROCISUR: Montevideo)

Hacke E (1990) Investigación en polvillos o royas del trigo realizada en el período 1985–1989 en Chile. In ‘Reunião Técnica sobre Ferrugens. Projeto Trigo’. CNPT/EMBRAPA, Passo Fundo, RS. pp. 1–28. (PROCISUR)

Haggag MEA, Dyck PL (1973) The inheritance of leaf rust resistance in four common wheat varieties possessing genes at or near the Lr3 locus. Canadian Journal of Genetics and Cytology 15, 127–134. open url image1

Hewstone MC (1983) Mejoramiento de trigos para el sur de Chile. In ‘Reunião de Melhoristas de Trigo do Cone Sul’. EMBRAPA-CNPT, Passo Fundo, RS. (Coord. O de S Rosa) pp. 101–109. Diálogo No. 9. (Programa Cooperativo de Pesquisa Agricola: Montevideo)

Kohli MM , Skovmand B (1997) Wheat varieties of South America. Names, parentage, pedigrees, and origins. (CIMMYT: México DF)

Kohli MM , Ulery A , Quincke M (2003) Intercambio de germoplasma regional de trigo en el Cono Sur. In ‘Estrategias y Metodologías utilizadas en el Mejoramiento de Trigo: un enfoque multidisciplinario’. INIA La Estanzuela, Colonia, Uruguay. (Eds MM Kohli, M Díaz de Ackermann, M Castro) pp. 230–242. (CIMMYT-INIA: Montevideo)

Kolmer JA (1996) Genetics of resistance to wheat leaf rust. Annual Review of Phytopathology 34, 435–455.
| Crossref | GoogleScholarGoogle Scholar | PubMed | open url image1

Kolmer JA, Liu JQ (2001) Simple inheritance of partial resistance to leaf rust in two wheat cultivars. Plant Pathology 50, 546–551.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Kolmer JA, Long DL, Hughes ME (2004) Physiologic specialization of Puccinia triticina on wheat in the United States in 2002. Plant Disease 88, 1079–1084.
| Crossref |
open url image1

Kolmer JA, Oelke LM, Liu JQ (2007) Genetics of leaf rust resistance in three Americano landrace derived wheat cultivars from Uruguay. Plant Breeding 126, 152–157.
| Crossref |
open url image1

Lewis S , Bullrich L , Suárez E (2003) Desarrollo de germoplasma premejorado de trigo para resistencia a roya mediante selección asistida por marcadores moleculares. In ‘Estrategias y Metodologías utilizadas en el Mejoramiento de Trigo: un enfoque multidisciplinario’. INIA La Estanzuela, Colonia, Uruguay. (Eds MM Kohli, M Díaz de Ackermann, M Castro) pp. 317–318. (CIMMYT-INIA: Montevideo)

Long DL, Kolmer JA (1989) A North American system of nomenclature for Puccinia recondita f.sp. tritici. Phytopathology 79, 525–529. open url image1

Luizzi DV, Gatti de DeLeón I, Cabrera N (1980) Selección por resistencia a roya de tallo (Puccinia graminis Pers. f. sp. tritici) en trigo. Investigaciones Agronómicas (Montevideo) 1, 32–35. open url image1

Madariaga R , Mellado M , Becerra V (2004). Significance of wheat yellow rust (Yr) genes in Chile. In ‘Abstracts [of the] 11th International Cereal Rusts and Powdery Mildews Conference’. John Innes Centre, Norwich, England, UK. p. A2.38.

McIntosh RA (1992) Close genetic linkage of genes conferring adult plant resistance to leaf rust and stripe rust of wheat. Plant Pathology 41, 523–527. open url image1

McIntosh RA , Wellings CR , Park RF (1995) ‘Wheat rusts: An atlas of resistance genes.’ (CSIRO: Canberra)

Rajaram S , Campos A (1974) Epidemiology of wheat rusts in the Western Hemisphere. CIMMYT Research Bulletin No. 27, México, DF.

Rajaram S , Singh RP , Torres E (1988) Current CIMMYT approaches in breeding wheat for rust resistance. In ‘Breeding strategies for resistance to the rusts of wheat’. (Eds NW Simmonds, S Rajaram) pp. 101–118. (CIMMYT: México DF)

Ribeiro R (1952) Evolución varietal del trigo en el Uruguay. Archivo Fitotécnico del Uruguay (Montevideo) 5, 373–391. open url image1

Roelfs AP (1988) Resistance to leaf and stem rusts in wheat. In ‘Breeding strategies for resistance to the rusts of wheat’. (Eds NW Simmonds, S Rajaram) pp. 10–22. (CIMMYT: México, DF)

Rosa Filho O (1997) Effect of the six glutenin loci on selected bread quality traits in wheat. PhD thesis, Oregon State University, Corvallis, OR, USA.

Rudorf G , Job MM , von Rosenstiel K (1933) Investigaciones sobre inmunidad en trigo. (Universidad Nacional de La Plata: Argentina)

Schramm W (1969) Molestias do trigo no RS. Ciência e Cultura (São Paulo) 21, 777–782. open url image1

da Silva AR (1966) Melhoramento das variedades de trigo destinadas às diferentes regiões do Brasil. Serviço de Informação Agrícola, Estudos técnicos No. 33, Rio de Janeiro.

da Silva PR (2002) Identificação e conversão de marcadores moleculares associados à resistência à ferrugem da folha em trigo. Dissertação de Mestrado, UFRGS, Porto Alegre, RS, Brasil.

Singh RP (1992) Genetic association of leaf rust resistance gene Lr34 with adult plant resistance to stripe rust in bread wheat. Phytopathology 82, 835–838. open url image1

Singh RP (1993) Resistance to leaf rust in 26 Mexican wheat cultivars. Crop Science 33, 633–637. open url image1

Singh RP, Huerta Espino J (1995) Inheritance of seedling and adult plant resistance to leaf rust in wheat cultivars Ciano 79 and Papago 86. Plant Disease 79, 35–38. open url image1

Singh RP , Huerta-Espino J , William M (2003) Resistencia durable a roya de la hoja y roya amarilla del trigo: genética y mejoramiento en el CIMMYT. In ‘Estrategias y Metodologías utilizadas en el Mejoramiento de Trigo: un enfoque multidisciplinario’. INIA La Estanzuela, Colonia, Uruguay. (Eds MM Kohli, M Díaz de Ackermann, M Castro) pp. 109–118. (CIMMYT-INIA: Montevideo)

Singh RP, Rajaram S (1991) Resistance to Puccinia recondita f.sp. tritici in 50 Mexican bread wheat cultivars. Crop Science 31, 1472–1479. open url image1

Singh RP, Rajaram S (1992) Genetics of adult-plant resistance of leaf rust in ‘Frontana’ and three CIMMYT wheats. Genome 35, 24–31. open url image1

Singh RP, Rajaram S (1994) Genetics of adult plant resistance to stripe rust in ten spring bread wheats. Euphytica 72, 1–7.
| Crossref | GoogleScholarGoogle Scholar | open url image1

de Sousa CNA, Barcellos AL (2000) Evaluation of leaf tip necrosis in Brazilian wheat genotypes. Annual Wheat Newsletter 46, 31. open url image1

de Sousa CNA , Barcellos AL (2001) Resultados de testes para necrose híbrida (Lr13) em populações F1 de cruzamentos de trigo na Embrapa Trigo. EMBRAPA Trigo, Comunicado On line No. 61. Disponível: http://www.cnpt.embrapa.br/biblio/p_co61.htm. Consultado: Agosto 2005*

Straib W (1937) Las razas fisiológicas de Puccinia glumarum en Sudamérica y su comportamiento en la infección comparado con el de las formas europeas. Archivo Fitotécnico del Uruguay (Montevideo) 2, 217–233. open url image1

The TT, Gupta RB, Dyck PL, Appels R, Hohmann U, McIntosh RA (1991) Characterization of stem rust resistant derivatives of wheat cultivar Amigo. Euphytica 58, 245–252.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Vallega J (1938) Dos nuevas selecciones de trigo de origen híbrido inmunes a Puccinia glumarum. Revista de la Facultad de Agronomía (La Plata) 22, 139–145. open url image1

Vallega J (1940) Especialización fisiológica de Puccinia graminis tritici en Argentina, Chile y Uruguay. Revista Argentina de Agronomía (Buenos Aires) 7, 196–220. open url image1

Vallega J (1955) Wheat rust races in South America. Phytopathology 45, 242–245. open url image1

Vallega J, Favret EA (1947) Royas y otros parásitos de los cereales en los valles andino-patagónicos. Revista de Investigaciones Agrícolas (Buenos Aires) 1, 269–277. open url image1

Vallega J, Favret EA (1952) Las royas de los cereales en Argentina. (I Parte). IDIA (Buenos Aires) 54, 17–39. open url image1

de Viedma L , Bozzano G (1986) Las Royas del trigo en Paraguay. In ‘Reunião de Especialistas em Ferrugens de Cereais de Inverno’. CNPT/EMBRAPA, Passo Fundo, RS. Diálogo No. 13. (Ed. CJ Molestina) pp. 153–164. (PROCISUR: Montevideo)

de Viedma L , Kohli MM , German S (2005) Sources of adult plant resistance for leaf rust of wheat in Paraguay. In ‘Wheat production in stressed environments: abstracts of oral and poster presentations [of the] 7th International Wheat Conference’. Mar del Plata, Argentina. pp. 164. (Secretariat of Agriculture, Animal Husbandry, Fisheries and Food)

Volovsky D (1945) Identificación de razas fisiológicas de Puccinia graminis tritici y P. triticina, algunos estudios efectuados en Chile. Agricultura Técnica [Santiago de Chile] 1, 70–78. open url image1

Volovsky D (1946) Nuevas razas fisiológicas de Puccinia triticina para Chile: notas científicas. Agricultura Técnica [Santiago de Chile] 6, 67. open url image1

Zoldan SM, Barcellos AL (2002) Postulation of genes (Lr) for resistance to leaf rust in Brazilian wheat cultivars. Fitopatologia Brasileira 27, 508–516.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Zoldan SM, Barcellos AL, de Sousa CNA (2000) Detecção do gene Lr 13 de resistência à ferrugem da folha em plântulas de trigo. Fitopatologia Brasileira 25, 512–516. open url image1