First report of Iris yellow spot tospovirus in Peru
In Peru, necrotic lesions and dieback were observed in onion crops (Allium cepa) grown near the cities of Supe and Ica in 2003. Samples were collected from symptomatic plants. Tests (DAS-ELISA) revealed the presence of Iris yellow spot tospovirus (IYSV – EPPO A2 list). In 2004 and 2005, symptoms of IYSV were observed again on onion crops in the Supe and Casma valleys. Similarly, IYSV was detected in symptomatic plants by ELISA and RT-PCR (Tomato spotted wilt tospovirus was not found in any tested sample). Additional samples were then collected from regions in northern and southern Peru and also gave positive test results. As onions have become significant export crops for Peru, further studies are needed to determine the impact of IYSV. This is the first report of IYSV in Peru.
The situation of Iris yellow spot tospovirus in Peru can be described as follows: Present, first found in 2003, several outbreaks have been detected in onion crops.
Sources
Mullis SW, Gitaitis RD, Nischwitz C, Csinos AS, Rafael Mallaupoma ZC, Inguil Rojas EH (2006) First report of onion (Allium cepa) naturally infected with Iris yellow spot virus in Peru. Plant Disease 90(3), p 377.