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Necrotic spot a new virus in California tomato fields

Issue Date: July 20, 2011
By Lisa Lieberman

During the 2008 growing season, tomato growers in Central California started observing symptoms of a virus that looked a lot like tobacco streak virus (TSV). They were finding light brown necrotic spots and streaks on the leaves, stems and petioles of infected plants. The incidence of these symptoms was relatively low in most fields—only 5 percent or less, although in a handful of fields the incidence was 20 percent or more. The problems with necrotic spot eased up in 2009, but then returned again in 2010. Tests for TSV turned out to be negative, however, and it has turned out that this disease is caused by a new virus, which has been named tomato necrotic spot virus (ToNSV).

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