Prosaro

Manufacturer
BAYER
Category
Fungicides
Registered until
2025-01-31
Registration number
16732
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 oilseed rape.

WHEAT, WINTER RYE
Maximum individual dose: 
1.0 litres product per hectare
Maximum number of treatments:
2 per crop
Latest time of application: 
end of flowering (BBCH 69)

BARLEY and OATS
Maximum individual dose: 
1.0 litres product per hectare
Maximum number of treatments:
2 per crop
Latest time of application: 
up to beginning of flowering (BBCH 61).

OILSEED RAPE
Maximum individual dose: 1.0 litres product per hectare
Maximum number of treatments: 
2 per crop
Latest time of application: 
56 days before harvest

Other specific restrictions: A minimum interval of 21 days must be observed between applications

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. Prosaro 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 oilseed rape.
PROTECT FROM FROST

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

RATE OF USE
Apply Prosaro at 1.0 litre per hectare
The maximum number of treatments per crop is 2.

Water volume
Apply Prosaro in 100-400 litres 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 Prosaro may be applied at any stage up to the end of flowering (BBCH 69) and in barley and oats up to beginning of flowering.
In oilseed rape Prosaro may be applied up to 56 days before harvest.

Mixing
Thoroughly shake the pack before use.
Add the required quantity of Prosaro 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.
*Prosaro will provide moderate control of these diseases

APPLICATION TIMING
A minimum interval of 21 days must be observed between applications in all crops

CEREALS
EYESPOT (Tapesia 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 (Septoria tritici and Stagonospora nodorum)
Apply before disease is established in the crop. To protect the upper leaves and ear apply Prosaro 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.
Prosaro 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 Prosaro at the first signs of disease. Where disease pressure remains high application may be repeated. Prosaro will only provide moderate control of powdery mildew in wheat.

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

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

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

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

Ear Disease Complex
Apply Prosaro soon after ear emergence until the end of flowering (GS59-69) for control of Fusarium ear blight in wheat (or moderate control in barley) and reduction of sooty moulds. Control of ear diseases can result in cleaner, brighter ears.
Through the control of ear blight, Prosaro 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 Prosaro in spring at the first signs of disease. For severe infections a second application may be necessary later.

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

OILSEED RAPE
Light Leaf Spot
Apply Prosaro 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.

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

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

RESISTANCE STRATEGY
Repeated application of Prosaro 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.

CAUTION: The possible development of disease strains resistant to Prosaro cannot be excluded or predicted. Where such resistant strains occur, Prosaro is unlikely to give satisfactory control.

 

Registered for culturesRateBBCHPreharvest Interval
Winter wheat1 l37 - 69
Spring wheat1 l37 - 69
Winter rye1 l37 - 69
Winter barley1 l37 - 61
Spring barley1 l37 - 61
Winter oats1 l37 - 61
Spring oats1 l37 - 61
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