Abstract

DE RUYVER, Roberto; DE SOUZA, Juan; BISCHOFF, Susana A.  and  FORMENTO, Norma. Atmospheric Circulation Associated To Appearance Cases Of Soybean Rust Spores At Parana, Argentina. Meteorologica [online]. 2011, vol.36, n.1, pp.19-29. ISSN 1850-468X.

Soybean rust is the most relevant disease  that causes significant soybean yield  losses in some regions of the world. Soybean rust was detected for the first time in Argentina in 2002. Nowadays, 18 million ha are cultivated with soybean in Argentina. The first step to provide an early warning of the disease is to know the atmospheric circulation associated to the appearance of Phakopsora pachyrhizi  urediniospores. Data from spore  samplers trap at INTA Parana station (60°31´W; 31°50´S) was used. The day in which spores were captured from the trap were considered as day zero. Daily mean circulation maps at 1000 hPa were studied  to find the best correlated  days  for zero days and the  three  previous ones. Mean maps were obtained between the best correlated days. The results showed an atmospheric circulation  pattern  from the northeast. This result  strongly suggests  that spores arrived from southern Brazil.

Keywords : Soybean rust; Atmospheric Circulation; Spores.

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