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Redigo Deter

Control pests, diseases and workload with Redigo Deter (active substances: prothioconazole and clothianidin). You’ll build the potential of your crop through to harvest with real yield benefits as part of an integrated programme – an additional 2.15 t/ha in wheat [1], 3.5 t/ha in barley [2]. In fact, Redigo Deter is suitable for all winter-sown varieties, including oats, rye and triticale. See also Deter.

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Why use Redigo Deter

Redigo Deter secures around 46% of the UK’s winter cereal area and an increasing number of growers routinely rely on it.

A better crop

Establishment is excellent, seedlings are healthier, crop stands are stronger and more abundant, and less prone to lodging. Grain quality is consistently high, enabling you to satisfy customer demands.

Aphid control

Redigo Deter comprehensively controls all aphid vectors of BYDV (Barley Yellow Dwarf Virus), including pyrethroid-resistant clones, for up to eight weeks into autumn. In addition, it shows activity on minor or regional pests that remain a threat due to the loss of chlorpyrifos insecticide.

Slug control

Early grain-hollowing damage is reduced, not simply minimising losses, but giving up to 12% extra healthy seedlings (Bayer slug trials).


Depending on pest levels, you may save the cost of at least one pyrethroid spray and find a reduced need for slug pellets. You’ll use less diesel, limit wear and tear and save on manpower. The application dose is convenient, too – 200 ml of Redigo Deter per 100 kg of seed (2 litres per tonne of seed).

True autumn management

With fewer crop passes, you’ll avoid going onto wet land, knowing that your seedlings are getting on with germination.

Equally, Redigo Deter’s extended aphid and BYDV activity can make foliar insecticide timings simpler when pest pressure is high and conditions limit suitable spraying days. It also improves your post-em herbicide programme planning, especially for black-grass.


Drill any time from 1 July to 31 December. Actually, Redigo Deter is particularly suitable for later-sown crops – barley, second wheats and crops after OSR.

Redigo Deter helps make the most of your crop. With no 18 m buffer zones for foliar sprays such as cypermethrin or restrictions near water courses, you can drill up to the field margins and cover the whole area against early threats.

Points to remember

  1. Do not sow seed treated with Redigo Deter between 1 January and 30 June.
  2. If aphid fly-in is heavy or prolonged, you may need a follow-up treatment. However, see our stewardship guidance here.
  3. Redigo Deter prevents slug damage to the seed but not the leaf. Where slugs are a risk, we recommend you also use a good-quality slug pellet at early crop emergence.
  4. You can choose Deter as a ‘straight’ insecticide seed treatment co-applied with any suitable fungicide.

 [1] Vs. untreated control; average of Bayer BYDV trials 2006-11.

 [2] Vs. untreated control; average of 13 Bayer trials, UK and France.


BYDV and other pests & diseases

About BYDV

Infection and secondary spread can continue in mild weather from autumn right through to early winter and, in severe cases, the random foci merge into much larger areas. These changes in leaf colour, together with associated alterations in the content of plant sap, attract further aphid vectors, compounding the BYDV problem.

“A few hours is all it takes”

Aphids alight on cereal plants in late summer/early autumn and, if carrying BYDV, can cause primary infections when feeding within a matter of hours. Aphid movement to neighbouring plants and the production of wingless young result in the much more damaging secondary spread of BYDV. As a consequence, saucer-shaped depressions, or foci, of discoloured and stunted plants appear from mid-winter onwards.

Cereals can also be infected via the 'green bridge' where wingless aphids 'walk in' from green debris (cereal volunteers or grasses) onto emerging cereals. This occurs most commonly in the West and South West of Britain and is associated with the bird-cherry oat aphid. Ploughing (especially of grassland) followed too closely by drilling will not break the 'green bridge' as aphids can survive on green (non-desiccated plant material) buried in the soil for several weeks, before making their way to the surface to infect the new crop.

BYDV risk

Coastal areas of the South, South East and South West are habitually at high risk to BYDV, but in a mild autumn/early winter, almost any part of the UK cereals area can suffer damaging BYDV infections.

 As disease development is heavily weather-dependent and influenced by the amount of virus carried by invading aphids, it is very difficult to predict likely BYDV infection levels. This helps to explain why roughly 60% of the UK winter cereals area has been routinely treated with an aphicide in autumn.

Crops emerging before the end of September are particularly at risk from BYDV, but aphid invasions and the consequent primary spread of BYDV can continue throughout a mild autumn/early winter. The very damaging secondary spread of BYDV generally occurs between late October and January, but in mild weather can continue into early spring.

Effect on yield

BYDV-infected cereals produce lower yields and poor-quality, shrivelled grain; the earlier infection occurs, the greater the effect. In winter barley, severe infection can reduce yield by 70-80% and in winter wheat by 25-30%.

Other pests and diseases

Winter varieties of wheat, oats, durum wheat, rye and triticale   Winter barley/oats
Fusarium seedling blight/stem base browning (Microdochium nivale and Fusarium culmorum)   Fusarium seedling blight/stem base browning (Microdochium nivale)
Bunt   Loose smut
Loose smut   Covered smut (winter-sown barley and winter oats)
    Leaf stripe


Drilling guidance

Drilled August/early September and/or drilled at lower seed rates Use of Redigo Deter before the end of the first week in September and/or at seed rates lower than 100 kg/ha may result in reduced BYDV control. However, the use of Redigo Deter in these situations is likely to provide the basis for a programmed approach to successful BYDV control that will need one (rarely two) subsequent spray.
Drilled middle 2 weeks in September Considerably increased BYDV risk and need for follow-up sprays.
Use a minimum of 100 kg seed/ha followed by a well-timed aphicide spray.
Here Redigo Deter provides the vital initial BYDV protection at a very busy time of year, before monitoring of aphid activity needs to begin.
Drilled late September or after A minimum seed rate of 125 kg/ha will normally provide equivalent protection to two well-timed aphicide sprays.

NB: With earlier drillings, in seasons and/or localities where aphid fly-in extends beyond the first week of November, an additional spray is likely to be required.

Reduced seed rates for winter cereals

The recent trend towards earlier drilling of reduced seed rates for winter cereals (especially wheat) can have a marked impact on the performance of Redigo Deter seed treatment.

Earlier drilling increases the exposure to intense aphid fly-ins during early autumn, with a greater attendant risk of BYDV infection.

Using lower than conventional seed rates, especially with seed of high thousand grain weight, results in fewer established plants per square metre. These more widely spaced plants grow and tiller more vigorously than conventional drillings, which leads to a faster dilution of clothianidin within the plants, reducing the period of protection afforded by Redigo Deter against BYDV. In addition, as crop populations decrease, individual plants suffer higher aphid levels, and BYDV infection pressure increases.

Nevertheless, in comparison to a pyrethroid spray, Redigo Deter products give superior aphid control on both 100 and 150 kg/ha plots.


More answers

Not fully convinced yet? Here are answers to important questions:

“I don’t have pest problems”

If the autumn is mild or wet, slugs and aphid/BYDV problems can flare up. Redigo Deter ensures excellent establishment leading to healthy seedlings, increased crop stands and support for better yields.

“I prefer to rely on pyrethroid sprays”

You can wait and see, but autumn is busy enough. Redigo Deter provides up to eight weeks’ aphid/BYDV protection from the point of drilling.

This helps side-step potential aphid resistance – Redigo Deter controls all aphids, including resistant clones. In addition, with extended aphid and BYDV activity, it can make foliar insecticide timings simpler when pest pressure is high and conditions limit suitable spraying days.

“But I drill late”

You can drill any time from 1 July to 31 December. Actually, Redigo Deter is particularly suitable for later-sown crops – barley, second wheats and crops after OSR.

“It’s not suitable for my rotation”

Redigo Deter is safe for use on all winter cereal varieties; not just wheat and barley, but oats, rye and triticale.

“I’ll have to recalibrate my drill”

It’s a good idea to recalibrate in any case. Seed lots vary and seed is a critical investment in any crop, so you want to make sure you’re putting in the right amount and getting the best possible establishment.

“My soil type is wrong”

Regardless of your soil, the risk of BYDV is growing due to warmer autumns and winters. In addition, all the restrictions on foliar sprays and the increase in resistant grain aphids mean that more crops are at risk than ever.


What growers say: video

“More than a seed treatment – a management tool”

See why successful growers like James Price from Oxfordshire rely on the capability of Redigo Deter to ease their autumn workload.


Save our seed treatments

Neonicotinoid (neonic) seed treatments like Redigo Deter are under threat like never before.

These are your seed treatments. You need to hear what people are saying and understand the arguments.

Most important, it's vital that you make your voice heard.

Act now so that common sense wins.


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