Zephyr

Manufacturer
BAYER
Category
Fungicides
Registered until
N/A
Registration number
03792
Active materials
Links

For use only as an agricultural fungicide.
A fungicide for the control of foliar and ear disease in winter and spring barley.
A suspension concentrate formulation containing 175 g/L prothioconazole and 88 g/L trifloxystrobin.

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.
Zephyr is a triazole and strobilurin fungicide recommended for control of a wide range of diseases on winter and spring barley.

WINTER and SPRING BARLEY
Diseases: Eyespot (Oculimacula spp.), Powdery mildew (Blumeria graminis), Yellow rust, Brown rust, Sooty moulds, Rhynchosporium leaf blotch, Net blotch.
Rate: 0.75L/ha
Critical comments: Maximum total dose 1.5 litres product per hectare. Latest time of application: at any stage before beginning of flowering (GS 61).

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).
Powdery Mildew (Blumeria graminis)
Apply Zephyr at the first signs of disease. Where disease pressure remains high application may be repeated.
Strains of barley powdery mildew resistant to Qol fungicides are common in Ireland. Where specific control of wheat mildew is required, this should be achieved through a programme of measures, including products with recommendations for control of mildew that contain different active substances used in mixture or sequence.
Yellow Rust (Puccinia striiformis)
Apply Zephyr 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
Apply Zephyr 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.
Ear Disease Complex
Apply Zephyr soon after ear emergence until the end of flowering (GS59-69). Control of ear diseases can result in cleaner, brighter ears.
Leaf Blotch (Rhynchosporium secalis)
Apply Zephyr 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 Zephyr 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.

CROP SPECIFIC INFORMATION
Zephyr may be used on all commercial varieties of winter and spring barley.

MIXING AND SPRAYING
Thoroughly shake the pack before use.
Add the required quantity of Zephyr 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.
Sprayers should be thoroughly cleaned before 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. Spray equipment should be thoroughly cleaned with water and detergent after use.

RESISTANCE
Zephyr contains trifloxystrobin, a member of the Qol cross resistance group. Zephyr should be used preventatively or as early as possible in the disease cycle and should not be relied upon for its curative potential. It should not be used where disease is already established. Use Zephyr as part of an Integrated Crop Management (ICM) strategy incorporating other methods of control, including where appropriate other fungicides with a different mode of action. You must not apply more than two foliar applications of Qol containing products to any cereal crop. Strains of wheat and barley powdery mildew resistant to QoI’s are common in Ireland. Failure to follow resistance management action may result in reduced levels of disease control. Limiting the number of sprays is an important factor in delaying the build-up of resistant pathogen populations. The Fungicide Resistance Action Committee (FRAC) produces recommendations that may be consulted for additional information.
Appropriate disease risk assessment or decision support systems must be used when deciding whether to treat with Zephyr.

CAUTION
The possible development of resistance to Zephyr cannot be predicted. Should it occur Zephyr may not give satisfactory control and no responsibility can be accepted for any loss incurred.

Registered for culturesRateBBCH
Winter barley0.75 l30 - 61
Spring barley0.75 l30 - 61