Spraing is an important disease of potatoes. Appearing as internal arcs and spots on tubers, but also sometimes as external rings, this disease seriously affects the quality of potato crops and can often lead to entire stocks being rejected. The disease can be caused by two different viruses: by Tobacco rattle virus (TRV) or Potato mop-top virus (PMTV). Both viruses are soil borne, TRV being nematode transmitted and PMTV transmitted by powdery scab (Spongospora subterranea). Testing of the soil by bait test followed by TaqMan for TRV and/or PMTV, enables growers to make decisions before planting.
Tobacco rattle virus or Potato mop top virus £199 (exc VAT) per sample.
Tobacco rattle virus and Potato mop top virus £228 (exc VAT) per sample.
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When submitting your sample please follow the guidelines outlined within our sample shipping information.
The relevant signed sample submission form must be included (in a separate bag if sample is damp); failure to send a sample submission form may result in a delay of your sample being tested and make diagnosis more difficult. To help us process your samples in the most efficient way please fill in as much information as possible on the relevant form below. Please ensure you provide your email address, 'Your Ref', 'Purchase order no' and 'Name and Address for Invoice' in the sections where applicable.
When sending plant pathogens and invertebrate samples from outside England and Wales for testing please email CropHealth@fera.co.uk who will issue you with the relevant Letter of Authority to ensure your samples are not delayed upon entry to the UK.
Spraing is the term given to a range of internal and external symptoms in potato tuber flesh consisting of brown, necrotic rings, arcs and flecks. Two viruses can cause these symptoms, Potato mop-top virus (PMTV) and Tobacco rattle virus (TRV).
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