Organizing Committee


Poster Presentations


Poster Presentations

Field survey of Phakopsora pachyrhizi on several hosts in Argentina

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

Asian soybean rust (ASR) caused by Phakopsora pachyrhizi requires living tissues to survive and to pass the unfavorable season, in absence of the soybean crop. Host range play an important role in the epidemiology of soybean rust fungi. At present, there are approximately 95 different species (most of them Fabaceae) worldwide reported as possible hosts of P. pachyrhizi. Argentina has 103 species (Fabaceae) described as possible inoculum reservoirs at the soybean growing area. During 2003-2005, legume species (native, exotic, wild, invasive and domesticated) were collected from this area. Studies of forage species were emphasized, on white clover, red clover, alfalfa, birds foot trefoil, yellow sweet clover; several beans as pea, green pea, chickpea; some weeds and ornamental trees like chivato (Delonix regia) and ceibo (Erythrina crista-galli). Other species of Convolvulaceae like Ipomoea nil (bejuco), Poaceae as Pennisetum clandestinum (kikuyo grass) and Commelinaceae like dayflower (Commelina virginica; C. erecta) had been studied, since they are hosts of a similar rust as P. pachyrhizi. At the beginning of 2003, three tropical species, kudzu (Pueraria lobata), mucuna (Styzolobium niveun) and guandul (Cajanus cajan) were determinated as P. pachyrhizi hosts by molecular techniques. Since 2004, only kudzu (P. lobata) in Misiones province and volunteer soybeans (Glycine max) in Salta, Chaco, Corrientes, Entre Ríos, Buenos Aires, Tucumán, Santa Fe and Misiones were identified as natural hosts of ASR in Argentina.

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