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Unicur (active substances: prothioconazole and fluoxastrobin) is our leading fungicide for use in bulb onions and shallots, giving you unrivalled control of downy mildew (Peronospora destructor) and reduction of bacterial rots associated with this disease. It also controls leaf blight (Botryotinia squamosa, anamorph Botryis squamosa) and has activity against Botrytis, Cladosporium, Stemphylium and Puccinia species. Combining the powerful strobilurin, fluoxastrobin with the triazolinthione, prothioconazole (tzt technology), Unicur strengthens plant health for better bulb quality from field to store.

Statement on Unicur for the 2022 season

Due to limitations in supply with a co-formulant used in Unicur, Bayer has successfully secured a re-approval from CRD of a former formulation of Unicur which does not include the co-formulant that is in short supply.    

This means that for the 2022 season, there will be two different authorized formulations of Unicur with two different MAPP numbers available in the market place:



As there are two different authorized formulations of Unicur available, this also means that two different MSDS exist.  The MSDS are named with the relevant Unicur MAPP number.  

What is Unicur?

A fungicide for the control of diseases in bulb onions and shallots.

Product Profile

Active substance 100 g/L prothioconazole + 100 g/L fluoxastrobin
Formulation Emulsifiable Concentrate
Pack Size                         
5 Litres
Water Volume
100-300 L/ha
Buffer Zone Category B 5m reducible by LERAP
MAPP 17402

Important Information

Crops Bulb onions, Shallots* see restrictions below
Max. individual dose
1.25 litres of product per hectare
Max. total dose
5.0 litres of product per hectare
Latest time of application
Up to 10% of leaves bent over (GS 47)


Do not apply by hand-held equipment e.g. knapsack sprayer

* Use only on shallot crops that will be mechanically harvested, treated crops must not be hand harvested.

Unicur may be used on all commercial varieties of bulb onions and shallots but if the crop is intended for processing consult the processor before use of Unicur.


Why you need Unicur

  • Nothing controls downy mildew like it
  • Safeguards quality
  • Combined strobilurin and tzt technology physiological effects
  • Boosts plant health and bulb quality from field to store
  • May be used on all commercial varieties of bulb onions

How Unicur works

The tzt technology in Unicur advances disease control and plant health. Being a
new generation DMI, prothioconazole combines exceptional protection with sustained curative activity for powerful broad-spectrum disease control. Uniquely for a DMI it also stimulates photosynthesis and enhances nitrogen assimilation to deliver greening and physiological effects in the same league as strobilurins enhancing yield and bulb resilience to bacterial infection.


When and how to apply

For the control of downy mildew (Peronospora destructor) and for a useful level of control of leaf blight, (Botryotinia squamosa, anamorph Botrytis squamosa).

Qualified minor use recommendation: Based on limited data, useful reductions can be expected of infections caused by Botrytis, Cladosporium, Stemphylium and Puccinia species and also some reduction of bacterial rots of bulbs associated with downy mildew infections.

Apply Unicur as part of a protectant programme, at any stage from when the leaf bases begin to thicken (BBCH 40, beginning of bulb formation) until when 10% of the leaves are bent over (BBCH 47).

Follow with further applications at an interval of about 14 days according to disease pressure. 

Application to young plants may cause some transient leaf chlorosis and leaf distortion. To avoid this and maximize the yield and quality benefits from Unicur, apply from the beginning of bulb formation.

Do not apply any more than two consecutive applications of Unicur.

Programme planning

It is important to structure downy mildew control programmes for optimum disease control with resistance and residue management. Trials have shown that the best partners to alternate with Unicur are mancozeb-based products as illustrated below.



Resistance Management

Apply fungicides according to manufacturer’s recommendations for the target disease (or complex) at the specific crop growth stage indicated. Effective disease management is a critical parameter in delaying the build-up of resistant pathogen populations.

Unicur is a mixture of two fungicides with different modes of action, a strobilurin and a triazolinthione. Unicur contains fluoxastrobin, a member of the Qol cross-resistance group.

For best resistance management solo applications of Unicur should be considered as solo QoI product use. The total number of sprays in a programme therefore restricts the number of Unicur applications per crop as follows;

Total no. of spray applications per crop
5 to 7 8 to 10 11 to 12
Max. recommended Solo Qol fungicide sprays
2 3 4

Unicur should be used preventatively and should not be relied on for its curative potential.

Use Unicur 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.

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



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