Poraz

Manufacturer
BASF
Category
Fungicides
Registered until
Registration expired
Registration number
11701
Active materials
Links
An emulsifiable concentrate containing 450 g/litre (39.8% w/w) prochloraz.

A broad-spectrum fungicide for use on wheat, barley, winter rye and winter oilseed rape.

DIRECTIONS FOR USE

All varieties of wheat, barley, winter rye and winter oilseed rape may be sprayed with Poraz.
Restrictions/Warnings
A period of at least 3 hours (or longer in poor drying conditions) without rain should follow spraying otherwise results may be reduced.
Avoid drift to areas outside those being sprayed having due regard to the prevailing weather conditions and spray quality being used.
Tank-mixtures of Poraz with other fungicides should not be applied to crops suffering from any other stress such as drought or waterlogging otherwise the crop may suffer some scorch from which recovery may not be complete.
Yellow and Brown rust are not effectively controlled by Poraz.
 
Disease Control
Poraz controls or gives protection against all the following diseases when applied as recommended: 
WINTER WHEAT
Disease: Eyespot; Glume blotch (Septoria nodorum); Leaf spot (Septoria tritici ); Powdery mildew.
 
Rate: Maximum Individual Dose: 0.9 l/ha.
Critical Comments: C
 
SPRING WHEAT
Disease: Powdery mildew
Rate: Maximum Individual Dose: 0.9 l/ha.
Critical Comments: C
 
SPRING AND WINTER BARLEY
Disease: Eyespot (Winter barley); Leaf blotch (Rhynchosporium); Net blotch; Powdery mildew.
Rate: Maximum Individual Dose: 0.9 l/ha.
Critical Comments: C
 
WINTER RYE
Disease: Eyespot; Leaf blotch (Rhynchosporium); Leaf spot (Septoria); Powdery mildew.
Rate: Maximum Individual Dose: 0.9 l/ha.
Critical Comments: C
 
WINTER OILSEED RAPE
Disease: Dark leaf / pod spot (Alternaria brassicae) (reduction only); Light leaf spot (Cylindrosporium brassicae); Grey mould (Botrytis cinerea); Leaf spot / stem canker (Phoma lingam); Stem rot (Sclerotinia sclerotiorum) (moderate control); White leaf spot (Pseudocercosporella capsellae).
Rate: Maximum Individual Dose: 1.0 l/ha
Critical Comments: C
 
Resistance management
Poraz 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 DMIs contact your agronomist or specialist adviser, and visit the FRAG-UK website. To reduce the risk of development of resistance, do not apply more than two full dose prochloraz-based treatments (oilseed rape, wheat, barley and rye) or for oilseed rape only, 2 split doses followed by a full dose. Use Poraz 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.
 
Crops
Time of Application
Cereals
Autumn sown wheat, autumn and spring sown barley and winter rye
Eyespot Control
Spray in the spring, from when the leaf sheaths begin to become erect until the third node is detectable. Any over-wintering eyespot or Rhynchosporium, and mildew on rye or barley will be controlled by Poraz applied at this time, and protection will be given against Septoria (wheat, rye) or net blotch (barley). If weather conditions continue to favour eyespot development after treatment, a second spray may be necessary 4 to 6 weeks later. Poraz sprayed for control of eyespot (Pseudocercosporella) will often give good reduction of sharp eyespot (Rhizoctonia) and Fusarium if these diseases are developing at the time of application, but it is not yet known when this effect is likely to be of benefit.
Foliar Disease Control
For protection against leaf spot (Septoria tritici ), glume blotch (Septoria nodorum) and powdery mildew on winter wheat, spray as soon as the ligule of the last leaf is visible if any of these diseases are present in the crop. If no disease is present, treatment should be delayed until the first signs of infection appear or Poraz should be applied as a protectant treatment at the end of ear emergence if the crop is still disease free. Best protection against ear diseases is achieved only by treatment at full ear emergence. For control of late infections of barley leaf diseases listed above including protection against net blotch; spray when disease appears on new growth, or as a protectant treatment when the ligule of the last leaf is visible if any of the diseases are present in the bottom of the crop. On spring wheat, spray if mildew begins to build up in the crop if this occurs before full ear emergence. For control of late infections of the rye leaf diseases listed above, spray if disease is present in the crop. Yellow and Brown rust are not effectively controlled by Poraz. If rust is present or anticipated on barley or on wheat a tank-mixture of Poraz with Corbel will give control and protection against further attack.
Autumn treatment – barley
For the control of mildew and Rhynchosporium and protection against net blotch in the autumn, spray at the onset of disease infection. To achieve maximum yield response it is essential the autumn application is followed by spring application. If only net blotch is present a reduced dose of 0.7 l/ha may be used. Latest time of application: Up to before grain milky ripe (GS71) and six weeks before harvest. Winter oilseed rape
Diseases of oilseed rape can develop and spread very rapidly. It is therefore important that crops are regularly inspected so as to detect sudden increases in disease levels. Poraz should be applied at the onset of disease development so as to contain the diseases at a low level and prevent them spreading. Poraz controls or gives protection against all the following diseases when applied as recommended:
Light Leaf Spot (Cylindrosporium brassicae)
Poraz should be applied at the first sign of light leaf spot in the autumn or winter when cool wet conditions favour spread of the disease. A split dose treatment may be used. A Poraz application during or shortly after flowering will prolong the control of light leaf spot where there is a risk of late build up of disease.
Dark Leaf / Pod Spot (Alternaria brassicae)
Alternaria mainly develops through the spring and summer, especially following hot humid weather. Apply Poraz as soon as Alternaria infection is seen on the upper leaves and stems, usually from mid-flowering but not later than the mottled seed stage. If disease pressure remains high, a second application of Poraz should be applied 2-3 weeks later. Poraz only gives a reduction of this disease.
Leaf Spot / Stem Canker (Phoma lingam)
Phoma leaf spot is spread by rain splash and can be found from October onwards. Apply Poraz at the first sign of infection during the autumn or winter.
Stem Rot (Sclerotinia sclerotiorum)
The spread of Sclerotinia is favoured by wet weather during flowering. For moderate control of the disease, spray Poraz from early flowering in high risk situations when spore release is occurring. Control is only achieved if Poraz is applied before the disease becomes established.
Grey Mould (Botrytis cinerea)
Poraz may give control of grey mould, and should be applied as soon as Botrytis develops from stem extension onwards and if the infection continues, apply a second spray during or after flowering.
 White Leaf Spot (Pseudocercosporella capsellae)
Apply Poraz in the spring from stem extension, when infection is seen on the leaves and before it spreads onto the pods. Latest time of application: 6 weeks before harvest.
 
Rate of Application
Wheat, Barley and Winter Rye:
Maximum Individual Dose: 0.9 l/ha.
Maximum Number of Treatments (per crop): 2.
For broad-spectrum disease control use 0.9 l/ha.
For control of Net Blotch only (Barley) use 0.7 l/ha.
For control of established Mildew and / or Rust
(Wheat and Barley) use 0.9 l/ha Poraz + 1 l/ha Corbel.
A fungicide with a different mode of action to prochloraz should be used for further disease control.
Winter Oilseed Rape
Maximum Individual Dose: 1.0 l/ha.
Maximum Number of Treatments (per crop): 2 at normal dose, or 2 at split dose followed by one application at normal dose.
The maximum total dose must not exceed 2.0 l product/hectare/crop.
For broad-spectrum disease control use 1.0 l/ha.
Split dose treatment – to control Light Leaf Spot only use 0.45 l/ha applied in autumn followed by 0.7 l/ha Poraz applied in spring when conditions favour disease spread.
A fungicide with a different mode of action to prochloraz should be used for further disease control.
 
 
Mixing and Spraying
Apply Poraz in 200–400 litres of water per hectare.
In dense crops or for the second treatment, the volume should be increased to 400 litres per hectare.
Apply as a MEDIUM quality spray. (For details see Boom Sprayers Handbook published by British Crop Protection Council).
Poraz should be applied to give good foliar cover. Adjust the boom height to give the correct height above target; alternate spray fans or cones should meet just above the top of the crop. Even cover with a well mixed spray is essential for good results. Forward speed should not exceed 10 km/hour (6 mph).
Check that the sprayer, spray bars and nozzles have been properly washed out to remove traces of the previous chemical. Ensure that the sprayer has been carefully calibrated. Nozzles should be selected to give MEDIUM spray quality.
Half-fill the sprayer tank with clean water and start agitating. Add the required quantity of Poraz and complete filling to the final volume.
Spray immediately after mixing and maintain agitation until the spray tank is empty. Even cover with a well-mixed spray is essential for good results.
Wash out the sprayer with water and liquid detergent immediately after use. Finally wash out with water and drain.
 
Registered for culturesRateBBCHPreharvest Interval
Winter wheat0.9 l042
Spring barley0.9 l042
Winter rye0.9 l042
Winter rape1 l042
Spring wheat0.9 l042
Winter barley0.9 l7142