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Asian soybean rust in Entre Ríos Province (Argentina):morphologic and pathometric characterization.

Presenter: Ing. Agr. Angela Norma Formento, Factores Bióticos y Protección Vegetal. INTA EEA Paraná
Coauthor(s): J de Souza, and I.G. Vicentin. Bióticos y Protección Vegetal. INTA EEA Paraná (Entre Ríos). Argentina

Asian soybean rust (ASR) was detected in Argentina during 2002-03 growing season. A year later, the disease spread over the northern area of the country and was observed in the North of Entre Ríos Province late in the season (April 24). The presence of Phakopsora pachyrhizi was confirmed by polymerase chain reaction (PCR) assay. During 2004-05 growing season, ASR was detected 52 days earlier in Entre Ríos (March 4) than the former growing season and resulted in the first reduction of soybean yield reported at the province. The objective of this research was to bring a morphological characterization of ASR symptoms and signs on leaflets and the urediniospores of the pathogen (Malupa sojae). The number of lesions per leaflet, uredinia per leaflet and uredinia per lesion were recorded. Since uredinia are found predominantly on the abaxial surface of the leaflet, counts were performed only on this surface. The mean number (n=50) of lesions was 333.4 (11.6 per cm2), and the mean number (n=73) of uredinia per leaflet was 1372.4 (48.67 per cm2). The mean number (n=3214) of uredinia per lesion was 2.65 (1 to 15). The urediniospores size was 27.8 (19.8-34.2) x 19.8 (14.4-23.4) µm. Uredinia on petioles and stems and telia stage (Phakopsora pachyrhizi) adjacent to uredinia on leaflets were registered late in the season.

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