Cereals: Barley mild mosaic virus and Barley yellow mosaic virus

Contact Us

  • Preferred contact Method:

  • Telephone

We will use the email address provided above to contact you about this service within 2 working days

Cereals: <em>Barley mild mosaic virus</em> and <em>Barley yellow mosaic virus</em>
  • Method Used
    TaqMan® PCR
  • Standard Turnaround Time
    10 working days

Barley yellow mosaic virus and Barley mild mosaic virus are pathogenic viruses which cause barley yellow mosaic disease of winter barley. Symptoms include yellow and mosaic flecking of young leaves often appearing in winter and early spring, where plant leaves start to show pale green and yellow colours. Over time the changes become more severe as the virus spreads throughout the plant. These changes can take the form of curled leaves and chocolate-brown necrosis associated with the resulting lesions. Barley yellow mosaic disease can heavily impact yield with up to 50% crop losses.

These viruses can be contracted soon after sowing, through Polymyxa graminis within soil infecting the plant root. This can cause this virus to be systemic and far reaching, as well as being difficult to control and prevent.

The barley yellow mosaic disease can cause a significant impact on the expected yield of your crop as affected plants usually have fewer tillers and irregular grain size. However, symptoms are not always obvious and sometimes the crop can undergo an apparent recovery. However this symptom recovery doesn't necessarily lead to a recovery in yield.

The symptoms can often be mistaken for nutrient deficiencies so understanding what is happening in the crop can lead to more informed decision making.

Submitting your Sample

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.

Download the sample submission form here



Shipping Information

When sending plant pathogens and invertebrates from outside England and Wales, and soil/other growing media from outside the European Union for testing please include the relevant Fera Letter of Authority (as issued by Fera). This will ensure your samples are not delayed upon entry to the UK. This Letter of Authority covers material to be sent for diagnosis of plant pests and pathogens only. Please do not send your sample until you are advised to do, as this may result in your sample being lost or destroyed.

Please be aware that as you are the customer, you are responsible for paying any customs duties or excise duties that may be raised by UK Customs when sending samples to Fera Science for testing.

Product Code




Method Used

TaqMan® PCR

Sample Info

Symptomatic plants and roots (small clump, dug up) with a small amount of soil.

You may also be interested in

Barley yellow dwarf virus and Soil borne cereal mosaic virus

This testing for cereal crops covers both Barley yellow dwarf virus (BYDV) and Soil-borne cereal mosaic virus.

Beet necrotic yellow vein virus (BNYVV) - Rhizomania

Rhizomania is caused by infection of the plants by Beet necrotic yellow vein virus (BNYVV).

Brassica virus screening (3 virus screen)

Tests to identify 3 viruses found to mostly affect plants in the cabbage (Brassicaceae) family, which includes Turnips and Cauliflower.