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Soybean rust management in Argentina.

Presenter: Antonio Ivancovich, INTA Pergamino, Argentina
Coauthor(s): G. Botta1; N. Formento2; S. Vallone3 and I. Bonacic4; INTA (National Institute of Agriculture Technology) 1Pergamino-Buenos Aires; 2Paraná-Entre Ríos; 3Marcos Juárez-Córdoba; 4Saenz Pea-Chaco.

Soybean is the most important crop in Argentina accounting for a great percentage of the gross national product. Soybean rust (SR), caused by Phakopsora pachyrhizi, is new to South America, being found in Brazil, Paraguay and in the northern provinces of Argentina since 2002.In order to minimize losses due to SR INTA developed since 2002 a National Project on SR involving research on: 1- Surveys for SR detection. a) On soybean; b) On alternative hosts. 2- Training on SR diagnose. 3- Identification of tolerant and resistant cultivars. 4- SR management system to reduce the disease incidence.1a- SR was detected only in two fields, in the northeast region during 2003; SR was detected in most of the soybean producing provinces during 2004; SR was detected in all of the soybean producing provinces during 2005.1b- SR detected on Kudzu, only in the province of Misiones during 2003, 2004 and 2005. SR detected on volunteer soybean plants collected in the main soybean region of Argentina, during and after the winter of 2005.2-Public and private researchers and extensionists were trained on SR diagnose.3-Different reactions to SR were detected among the naturally infected cultivars tested in Misiones.4-SR was efficiently controlled by a group of fungicides tested in Corrientes. Early planting and cultivars of groups III and IV were less affected by SR.

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