TY - JOUR
AU - Natti, Paulo Laerte
AB - Phakopsora pachyrhizi is a biotrophic fungus that needs living plant tissue in order to survive. The fungus causes Asian rust on soybean and costs billions of US dollars every year for its control in South America. Despite the regulatory measure that prohibits the cultivation of soybeans in some months of the year (soybean-free period) in Brazil, the presence of soybean production areas in neighboring countries, such as Paraguay and Bolivia, may help the survival of the pathogen between crop seasons. It is known that P. pachyrhizi urediniospores can be transported thousands of kilometres by the wind. In this context, the objective of this study was to develop a mathematical model to simulate the atmospheric transport of P. pachyrhizi urediniospores from the west, Paraguay/Bolivia to Paraná/Brazil, through storms from cold fronts. The transport of urediniospores was modeled by a diffusive-convective-reactive equation. The mathematical model was discretized using the finite difference method. The algebraic system resulting from discretization was solved by the Gauss-Seidel iterative method. Wind direction and the velocity of cold fronts that crossed Paraná state between October 2018 and February 2019 were used. For validation, real cases of rust occurrence in Paraná state informed by the Anti-rust Consortium Portal in the season 2018/19 were used. A total of nine cold fronts occurred in the studied period. The wind direction varied between months. The results confirm that it is possible for urediniospores from infected areas located in a country on the west to be transported and deposited on the east, in the state of Paraná. The first case of soybean rust in Paraná was registered 10 days after the first cold front, suggesting that the transported and deposited urediniospores were still viable for host infection. This work reinforces the importance of the establishment of the soybean-free period in other soybean produced countries. The model also provides a better understanding of the pathogen’s spatial dynamics, potentially enabling the correct use of fungicides.
TI - Numerical simulation of atmospheric transport of Phakopsora pachyrhizi urediniospores in South America using the state of Paraná-Brazil as a model
JF - European Journal of Plant Pathology
DO - 10.1007/s10658-022-02533-7
DA - 2022-08-01
UR - https://www.deepdyve.com/lp/springer-journals/numerical-simulation-of-atmospheric-transport-of-phakopsora-pachyrhizi-5Iq8uvvExd
SP - 979
EP - 990
VL - 163
IS - 4
DP - DeepDyve
ER -