Tobacco ringspot virus

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Tobacco ringspot virus symptoms on tobacco leaf (click on image to enlarge it)
Author(s): Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images

Tobacco ringspot virus (TRSV)

The virus can infect solanaceous crops, cucurbits, legumes and other crops. It appears to be native in America and is now found in many other regions. However, it is absent from most parts of Europe and under quarantine there. Symptoms depend on the type of plant infected, but stunting and deformations of leaves and fruits are common. In tobacco ring and line patterns appear on the foliage. In soybean the buds and leaflets become deformed and necrotic. The virus can be transmitted by the nematode Xiphinema americanum, pollen, seeds and mechanical contact.

Vernacular names
• Deutsch: Tabakringfleckenkrankheit
• English: Tobacco ringspot virus (TRSV)
• Español: manchas en anillo del tabaco
• Français: virus de la nécrose annulaire du tabac

The particles are isometric and about 28 nm in diameter. Like in other Secoviridae, the genome consists of 2 positive-sensed ssRNA molecules. RNA1 of TRSV encodes 4 non-structural proteins and RNA2 the coat protein and movement protein.

For an identification guide see the EPPO (2017) Standard PM 7/2 (2).