First report of Iris yellow spot virus on Onion in Uruguay

VIRUS

URUGUAY

CEBOLLAS

BIBLIOGRAFIA NACIONAL QUIMICA

2010

From October to December 2005, onion (Allium cepa) plants in seed-production fields in south Uruguay (Canelones) had symptoms suggestive of those caused by Iris yellow spot virus (IYSV; genus Tospovirus, family Bunyaviridae). Symptoms included diamond-shaped lesions on seed stalks (scapes), each 1 to 5 cm long with a necrotic border, green center, and sometimes a second necrotic area in the center of the diamond (2,3). Necrotic lesions with more irregular shape were also associated with diseased plants. In 2006, scape samples with these symptoms were collected from four onion seed crops and assayed for IYSV using an IYSV-specific antiserum (Agdia Inc., Elkhart, IN) in a double-antibody sandwich-ELISA. IYSV was detected in all four onion seed crops monitored in 2006. IYSV incidence, expressed as the number of plants with symptoms, ranged from 87% identity only with IYSV N protein sequences in GenBank. Because of the presence of IYSV in Brazil, Chile, and Peru, this first documentation, to our knowledge, of IYSV in onion crops in Uruguay suggests that the threat of IYSV to onion is increasing in South America.

Plant disease v. 94, no. 6, 2010. -- p. 786

American Phytopathological Society

2010

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Inglés

Artículo

http://dx.doi.org/10.1094/PDIS-94-6-0786A

Uruguay

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