Detection of Soybean Rust caused by Phakopsora pachyrhizi in Northwestern Argentina

Plant Disease
L D PloperA P Castagnaro

Abstract

Asian soybean rust, caused by Phakopsora pachyrhizi, is regarded as one of the most destructive diseases of soybean (Glycine max (L.) Merr.). In Argentina, it was first detected in the province of Misiones in the northeast near Paraguay and Brazil during the 2001-02 growing season (2). The following season, it also was found in the neighboring province of Corrientes. However, it did not reach major soybean production areas in northern Argentina until the end of the 2003-04 season. During April 2004, as soybean crops were nearing maturity, the disease was found throughout the region of northwestern Argentina, which includes the provinces of Tucumán, Salta, Jujuy, Catamarca, and Santiago del Estero, where approximately 6% of the soybean crop of Argentina is produced. During February and March, the area had a severe drought and above average temperatures, but in April, rainfall was abundant, particularly during the first half of the month. Soybean rust was first observed on 16 April in several locations of the departments (counties) of Moreno and Jiménez in the province of Santiago del Estero, and the following week in the departments of Alberdi, Burruyacú, Cruz Alta, Famaillá, La Cocha, and Leales in the province of Tucumán, in t...Continue Reading

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