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Sampling urediniospores of Phakopsora spp. with spore traps in Argentina

Presenter: Ing. Agr. A. Norma Formento, Protección Vegetal y Factores Bióticos. INTA EEA Paraná
Coauthor(s): J. de Souza1 and M. Cracogna2. 1Protecc. Veg. y Fact. Bióticos. INTA EEA Paraná (Entre Ríos), 2INTA EEA Reconquista (Santa Fe). Argentina

Urediniospores of Phakopsora pachyrhizi are the primary inoculum of Asian soybean rust (ASR). They are abundantly produced during the growing season and disseminated by the wind for long distances. In order to develop management measurements for the disease, it is necessary to understand its epidemiology. Two important epidemiological questions are monitoring the presence of pathogen propagules and environmental conditions to develop forecasting systems. The objective of this study was to analyze the temporal development of inoculum of Phakopsora spp. captured in spore traps. We report preliminary results carried out in Reconquista and Paraná (Argentina) during 2004-05 growing season. We used a spore trap (weather-vane type) with a 45 slide placed at 120 cm height. Temperatures and leaf wetness was registered in local meteorological stations. Total number of urediniospores collected during the growing season was 516 in Reconquista and 32 in Paraná. ASR was first observed on 6 January in Reconquista after collecting 17 urediniospores on 16 December. The environmental conditions that followed were not conducive for disease development and ARS progress was not observed. Afterwards, ASR was detected on 7 April in the field. Since this date till the end of May, 333 urediniospores were collected and ASR was observed in several locations near to Reconquista. ASR was first detected in the field on 5 March in Paraná, 6 days after collecting 12 urediniospores. The weather conditions following the first detection were conducive for disease development until the end of the growing season, when ASR presence was generalized.

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