Kestrel

Manufacturer
BAYER
Category
Fungicides
Registered until
2025-01-31
Registration number
16751
Active materials
Links

A fungicide for the control of stem-base, foliar and ear diseases in winter and spring wheat (also reduction of the mycotoxin deoxynivalenol), winter rye, winter and spring barley, winter and spring oats and for disease control in winter and spring oilseed rape.

A fungicide for the control of stem-base, foliar and ear diseases in winter and spring wheat (also reduction of the mycotoxin deoxynivalenol), winter rye, winter and spring barley, winter and spring oats and for disease control in winter and spring oilseed rape.

WHEAT, WINTER RYE
Maximum individual dose: 1.0 litre product per hectare
Maximum total dose: 2.0 litres product /ha
Latest time of application: before grain milky ripe stage.

BARLEY and OATS
Maximum individual dose: 
1.0 litre product per hectare
Maximum total dose: 
2.0 litres product /ha
Latest time of application: 
up to the beginning of flowering

OILSEED RAPE
Maximum individual dose:
 1.0 litre product per hectare
Maximum total dose: 
2.0 litres product /ha
Latest time of application: 
56 days before harvest.

DIRECTIONS FOR USE
IMPORTANT: This information is approved as part of the Product Label. All instructions within this section must be read carefully in order to obtain safe and successful use of this product. Kestrel is a mixture of a triazolinthione and triazole fungicide recommended for control of a wide range of diseases on winter and spring barley, winter and spring wheat, winter rye, winter and spring oats and winter and spring oilseed rape.
PROTECT FROM FROST

CROPS
Kestrel may be used on all commercial varieties of winter and spring barley, winter and spring wheat, winter rye, winter and spring oats and winter and spring oilseed rape.

RATE OF USE
Apply Kestrel at 1.0 litre per hectare. The maximum total dose per crop is 2.0 litres per hectare.

APPLICATION
Water volume
Apply Kestrel in 100-300 litres of water per hectare. The higher spray volumes are recommended where the crop is dense or disease pressure / risk is high to ensure good penetration to the lower leaves and stem bases. Disease control may be compromised by reducing water volumes, where good spray coverage is difficult to achieve.
A spray pressure of 2-3 bar is recommended.

Spray quality
Apply as a MEDIUM spray quality (as defined by BCPC).

Latest Permitted Timing
In wheat and rye Kestrel may be applied at any stage before grain milky ripe stage and in barley and oats up to beginning of flowering.
In oilseed rape Kestrel may be applied up to 56 days before harvest.

Mixing
Thoroughly shake the pack before use.
Add the required quantity of Kestrel to the half-filled spray tank with the agitation system in operation and then fill to the required level. Continue agitation at all times during spraying and stoppages
until the tank is completely empty. Spray immediately after mixing.

General
Sprayers should be thoroughly cleaned with water and detergent after use, and filters and jets checked for damage and blockages.
Boom height should be adjusted to ensure even coverage of the crop, particularly at later growth stages. The correct height is one at which the spray from alternate nozzles meets just above the crop, In dense crops, at later growth stages, higher water volumes should be used.

DISEASES CONTROLLED
Wheat
Eyespot (reduction of the incidence and severity), Septoria (leaf and glume blotch), powdery mildew, yellow rust, brown rust, tan spot, ear disease complex* (Fusarium ear blight (reduction of deoxynivalenol) and reduction of sooty moulds).
Barley
Eyespot (reduction of the incidence and severity), powdery mildew, yellow rust, brown rust, ear disease complex complex* (Fusarium ear blight and reduction of sooty moulds), Rhynchosporium, net
blotch.
Rye
Eyespot (reduction of the incidence and severity), powdery mildew, brown rust, Rhynchosporium.
Oats
Eyespot, crown rust and mildew
Oilseed rape
Light leaf spot*, Phoma leaf spot/stem canker, and Sclerotinia stem rot.
*Kestrel will provide moderate control of these diseases

APPLICATION TIMING
CEREALS
Eyespot (Oculimacula spp.)
Spray in the spring at the first sign of disease, from when the leaf sheaths begin to become erect until the 2nd node is detectable (GS 30-32).

Septoria Leaf Blotch and Glume Blotch (Mycosphaerella graminicola and Stagonospora nodorum)
Apply before disease is established in the crop. To protect the upper leaves and ear apply Kestrel at full flag leaf emergence (GS 37) up to mid-flowering (GS 65). Where disease pressure remains
high application may be repeated.
Applications to upper leaves where S. tritici symptoms are present are likely to be less effective.
Kestrel contains two DMI fungicides. Resistance to some DMI fungicides has been identified in Septoria leaf blotch (Mycosphaerella graminicola) which may seriously affect the performance of some products. For further advice on resistance management in DMI’s contact your agronomist or specialist advisor, and visit the FRAG-UK website.

Powdery Mildew (Blumeria graminis)
Apply Kestrel at the first signs of disease. Where disease pressure remains high application may be repeated.

Yellow Rust (Puccinia striiformis)
Apply Kestrel at the first signs of disease. A second application may be made 2-3 weeks later if re-infection occurs. Applications made to established infections are likely to be less effective.

Brown Rust (Puccinia triticina and P hordei)
Apply Kestrel at the first signs of disease. A second application may be made 2-3 weeks later if re-infection occurs. Applications made to established infections are likely to be less effective.

Crown Rust (Puccinia coronata)
Apply Kestrel at the first signs of disease. Kestrel controls crown rust in winter and spring oats. A second application may be made 2-3 weeks later if re-infection occurs. Applications made to established infections are likely to be less effective.

Tan Spot (Pyrenophora tritici-repentis)
Apply Kestrel at the first signs of disease in spring or early summer. Where disease pressure remains high application may be repeated.

Ear Disease Complex
Apply Kestrel soon after ear emergence until the end of flowering (GS59-69) for moderate control of Fusarium ear blight in wheat and reduction of sooty moulds. Control of ear diseases can result in cleaner, brighter ears.
Through the control of ear blight, Kestrel effectively reduces the level of the Fusarium mycotoxin deoxynivalenol (DON) in wheat grain. However, where Fusarium levels are high, the reduction achieved may not always be sufficient to ensure that DON levels fall below the statutory limit.

Leaf Blotch (Rhynchosporium secalis)
Apply Kestrel in spring at the first signs of disease. For severe infections a second application may be necessary 2-3 weeks later.

Net Blotch (Pyrenophora teres)
Apply Kestrel at the first signs of disease in spring/early summer. For severe infections, a second application 2-3 weeks later will give most effective control when conditions remain favourable for disease development.

OILSEED RAPE
Light Leaf Spot
Apply Kestrel in autumn/winter (usually late October to early December) protectively. Follow up spray(s) may be required in early spring from the onset of stem elongation, depending on disease development.
Strains of light leaf spot resistant to azole fungicides are known to exist. To avoid the development of resistance apply Kestrel protectively in response to disease forecasts. Where possible, avoid the use of products containing azoles when targeting other diseases such as Sclerotinia at mid-flowering.

Phoma Leaf spot/Stem Canker
Apply Kestrel in autumn at the first sign of disease. Repeat application in late autumn/ winter, if disease symptoms reoccur.

Sclerotinia stem rot (Sclerotinia Sclerotiorum).
Apply Kestrel at early to full flower.

RESISTANCE STRATEGY
Repeated application of Kestrel alone should not be used on the same crop against a high risk pathogen such as cereal powdery mildew. Tank mixtures or alternation with fungicides having a different mode of action (eg morpholines) have been shown to protect against the development of resistant forms of disease.
Kestrel contains a DMI fungicide. Resistance to some DMI fungicides has been identified in Septoria leaf blotch (Mycosphaerella graminicola) which may seriously affect the performance of some products. For further advice on resistance management in DMI’s contact your agronomist or specialist advisor, and visit the FRAG-UK website.

Registered for culturesRateBBCHPreharvest Interval
Winter wheat1 l37 - 69
Spring wheat1 l37 - 69
Winter rye1 l37 - 69
Winter barley1 l37 - 69
Spring barley1 l37 - 69
Winter oats1 l37 - 69
Spring oats1 l37 - 69
Winter wheat1 l30 - 32
Spring wheat1 l30 - 32
Winter rye1 l30 - 32
Winter barley1 l30 - 32
Spring barley1 l30 - 32
Winter oats1 l30 - 32
Spring oats1 l30 - 32
Winter rape1 l056
Spring rape1 l056