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Turnip yellows virus (TuYV) Brassicas OSR

Formerly beet western yellows virus (BWYV)

Turnip yellows virus (TuYV)


Formerly beet western yellows virus (BWYV)

Pathogen

Virus

Hosts

Oilseed Rape, brassica and lettuce crops. Cruciferous weeds such as shepherd`s purse and charlock and a range of other commonly occurring species including chickweed, corn poppy and scarlet pimpernel.

Symptoms

The symptoms which can appear in late spring, are an interveining yellowing of the leaves and a red or purpling of the leaf margins which can be confused with nutritional disorders.

Development

The disease is transmitted by several aphid species, but primarily by the peach potato aphid (Myzus persicae), during the autumn.

Favourable Factors

Seasons when aphids are numerous, which typically follow mild winters and warm springs, or proximity to infected sugar beet crops.

Importance

TuYV is thought to be widespread throughout the UK although more prevalent in the oilseed rape growing areas in the south of England and crops are most at risk in mild autumns favourable for aphid invasion.
This disease is a potential major problem and can cause yield losses of up to 25 % as well as reductions in oil content.

Control

• Control of aphid vectors with foliar insecticides, however the vast majority of M. persicae are now MACE (resistant to pirimicarb) and quite a high proportion are KDR (i.e. resistant to pyrethroid insecticides). There is no resistance to neonicotinoid insecticides.
• Resistant oilseed rape varieties such as Amalie.
• Insecticide seed treatments did prove to be effective method in controlling aphid vectors and protecting yield potential from this virus

Tuyv Osr A2 LibLeaf symptoms of TuYV
Tuyv Osr A1 LibLeaf symptoms of TuYV

Identification and Management of OSR diseases

Find out more information on the key disease threats to your oilseed rape crop. For each disease you will find out the importance of the disease in terms of potential yield penalty, how to identify the disease in its early stages and our advice on the best control strategies.

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