Centaur

Manufacturer
BAYER
Category
Fungicides
Registered until
Registration expired
Registration number
13852
Active materials
Links

A contact and systemic fungicide for the control of a wide range of diseases on winter wheat, winter and spring crops of barley and oats, rye, winter oilseed rape, winter and spring field beans and sugar beet.

FOR USE ONLY AS AN AGRICULTURAL/HORTICULTURAL FUNGICIDE

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. For best disease control and yield benefit Centaur should be applied at an early stage of disease development, before infection spreads to new crop growth.

RESTRICTIONS
A minimum interval of 21 days must be observed between applications on sugar beet.
PROTECT FROM FROST
STORE IN A COOL DRY PLACE
SHAKE WELL BEFORE USE

The possible development of diseases resistant to Centaur cannot be excluded or predicted. Where such resistant strains occur, Centaur may not give satisfactory control and no responsibility can be accepted for any loss incurred. Centaur applied to winter wheat or winter oats in the spring at GS 30-33 may, on occasion, cause straw shortening. This effect causes no loss of yield and can be beneficial in a potential lodging situation.

RESISTANCE MANAGEMENT
Repeated application of Centaur 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.

DISEASES CONTROLLED
Cereals
WINTER WHEAT
Diseases: Septoria leaf blotch Septoria tritici, Glume blotch S. nodorum, Yellow rust, Brown rust, Ear disease, Powdery mildew, Eyespot.

WINTER BARLEY
Diseases:  Yellow rust, Brown rust, Powdery mildew, Leaf blotch Rhynchosporium,  Net blotch, Eyespot.

SPRING BARLEY
Diseases: 
Yellow rust, Brown rust, Powdery mildew, Leaf blotch Rhynchosporium,  Net blotch.

RYE
Diseases: Brown rust, Powdery mildew.

WINTER and SPRING OATS
Disases: 
Crown rust, Powdery mildew.

WINTER OILSEED RAPE
Diseases: Light leaf spot, Phoma leaf spot.

FIELD BEANS
Diseases: Chocolate Spot, Bean Rust.

SUGAR BEET
Diseases: Powdery mildew, Ramularia leaf spot.

CROP SPECIFIC INFORMATION
Application
Boom height should be adjusted so that the output from alternate nozzles meets just above the crop. Apply Centaur in 200 to 400 litres of water per hectare. The higher spray volumes are recommended where the crop is dense to ensure good penetration to the lower leaves and stem bases. A pressure of 2-3 bar (30-40 psi) is recommended. Good spray cover of the target is essential. Ensure the sprayer is in good condition and that the correct nozzles are fitted and working correctly.
Apply Centaur as a MEDIUM quality spray (as defined by BCPC).

CEREALS
Centaur may be used on all varieties of winter wheat, winter and spring barley and oats, and rye.
Maximum individual dose: 0.4 litre per hectare
Maximum total dose per crop: 1.2* litre per hectare
*0.8 L/ha of this dose can be applied in the spring and summer.
Barley and oats - Up to and including emergence of ear complete stage (GS 59).
Winter wheat and rye - Before caryopsis watery ripe stage.

Diseases Controlled - Application Timing
Septoria Leaf Blotch and Glume Blotch (Septoria tritici and S. nodorum) (Winter Wheat)
Apply Centaur at the first signs of disease. Where infection may occur following a “rain-splash event”* apply Centaur as soon as possible afterwards to prevent visible symptoms developing.
It is important to protect both the second leaf and flag leaf.
Centaur provides prolonged protection from re-infection but a repeat application may be made if necessary.
Centaur 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.
* A “rain-splash event” is defined as 10 mm or more of rain in up to 3 consecutive rain days i.e. days with 1 mm or more of rain; 5 mm of rain in any one day may be sufficient where stem elongation is incomplete or in short or thin crops.

Yellow Rust (Winter wheat, winter and spring barley)
Apply Centaur at the first signs of disease, before 1% of any leaf is infected. Applications made to established infections are likely to be less effective.
Centaur provides prolonged protection from re-infection. A repeat application may be made if necessary.

Brown Rust (Winter wheat, winter and spring barley, rye)

Crown Rust (Winter and spring oats)
Apply Centaur when rust is first detected. Centaur provides prolonged protection, but a repeat application may be made if necessary.

Ear Diseases (Winter wheat)
An application of Centaur during full ear emergence (GS 59) gives control of mildew, rusts and Septoria on ears and provides a useful reduction of Cladosporium sooty mould.

Powdery Mildew (Winter wheat, winter and spring barley, winter and spring oats, rye)
Apply Centaur at the start of mildew development when not more than 2% infection is present on the lower leaves.
Centaur provides prolonged protection from re-infection. A second treatment may be applied where crops are at risk from later attacks.
For autumn control of powdery mildew on winter barley drilled before October. On light land apply Centaur when 5% of the surface area of any of the lower leaves is infected. On heavy land only treat if mildew infects the upper leaves.

Rhynchosporium (leaf blotch) (Winter and spring barley)
When applied to control other diseases, Centaur will give moderate control of Rhynchosporium. Centaur should be applied during the early stage of disease development.

Net Blotch (Winter and spring barley)
When applied to control other disease Centaur will give a useful reduction of net blotch.

Eyespot (Winter wheat, winter barley)
When applied between GS 30-34 to control other diseases, Centaur gives a useful reduction of eyespot.

EFFECT ON CROP HEIGHT
Centaur applied to winter wheat or winter oats in the spring at GS 30-33 may, on occasion, cause straw shortening. This effect causes no loss of yield and can be beneficial in a potential lodging situation.

WINTER OILSEED RAPE
Centaur may be used on all varieties of winter oilseed rape.
Maximum individual dose: 0.5 litre per hectare
Maximum total dose per crop: 1.0 litre per hectare
Centaur may be applied at any time before the lowest pods are more than 2 cm long.

Diseases Controlled - Application Timing
Light Leaf Spot and Phoma Leaf Spot
Apply Centaur in the spring at the start of stem extension.
In high risk situations and on more susceptible varieties, apply a two spray programme of Centaur; the first spray in the autumn between when ground cover has been achieved and cessation of growth in early winter and the second spray in the spring at the start of stem extension.

FIELD BEANS
Centaur may be applied to all varieties of winter and spring field beans.
Maximum individual dose: 0.4 litre per hectare
Maximum total dose per crop: 0.8 litre per hectare
Centaur must not be applied less than 6 weeks before harvest.

Diseases Controlled - Application Timing
Bean Rust
Centaur provides prolonged protection. Apply Centaur when rust is first detected. A repeat application may be necessary.
When bean rust continues to develop and further control is necessary, an alternative product must be used.

Rust
Apply Centaur when rust is first detected, which usually occurs during periods of warm, humid weather.
Repeat applications should be made at intervals of 14-21 days, allowing an interval of at least 14 days between the final application and harvest.

SUGAR BEET
Maximum individual dose: 0.3 litre per hectare.
Maximum total dose per crop: 0.6 litre per hectare
A minimum interval of 21 days must be observed between applications.
Centaur must not be applied less than 14 days before harvest.

Diseases Controlled - Application Timing
Powdery Mildew and Ramularia Leaf Spot
Apply Centaur at the first signs of disease, before it becomes established. Centaur gives prolonged protection from re-infection, but a second application can be applied where crops are at risk from later attacks.

Rust
Apply Centaur at the first signs of rust infection, before the disease becomes established. Centaur gives prolonged protection from re-infection, but a second application can be applied if necessary.

MIXING
Thoroughly shake the pack before use.
Add the required quantity of Centaur 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.
Wash out all spray equipment with water immediately after use. Triple rinse container before disposal and do not re-use container for any other purpose.

Registered for culturesRateBBCHPreharvest Interval
Winter wheat0.4 l0
Winter barley0.4 l0
Spring barley0.4 l0 - 59
Winter oats0.4 l0
Spring oats0.4 l0
Winter rye0.4 l0
Spring rye0.4 l0
Beans0.4 l042
Winter rape0.5 l0
Sugar beets0.3 l014