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Monceren DS contains pencycuron and is our market-leading potato tuber treatment for the control of Rhizoctonia solani.

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What is Monceren DS?

Monceren DS is recommended for the control of black scurf (Rhizoctonia solani) and some reduction in stem canker. Rhizoctonia is able to exist freely in soils, but disease transmission can also take place from sclerotia present on seed tubers. Monceren DS is primarily used for control of the tuber-borne inoculum.

Product Profile

Active substance 12.5% pencycuron
Formulation Powder
Pack Size             
2 kg
Water Volume
MAPP 11292

Important Information

Crops Seed potatoes (all varieties)
Max. individual dose
2 kg product per tonne seed
Max. number of treatments
1 per batch
Latest time of application
At planting

When and how to apply

Seed tubers should be free from soil deposits at treatment – see also ‘Seed quality’ below. Monceren DS is applied to seed tubers during the planting process. Whichever application technique is chosen, it is essential to obtain an even distribution of the product on the tubers for optimum efficacy. The action of the potato planter achieves this very efficiently provided Monceren is initially distributed to some extent within the hopper load of tubers. A number of approaches are available:

Hopper application

Measure the quantity of Monceren required to treat a hopper load of seed tubers. One quarter fill the hopper with seed tubers, sprinkle over the tubers one third of the required quantity of Monceren, add a further quarter of the seed tubers and sprinkle a further third of the Monceren powder over the tubers, and so on in layers until the hopper is completely filled with
seed tubers. Depending on the size and shape of the hopper, the number of layers required may be varied, provided even coverage of Monceren on the tubers is obtained as they are planted. Cover the hopper at the end of the filling process.

On-planter applicator

Monceren may be applied directly onto the tubers using powder metering units fitted to the planter hopper e.g. Team Powder Applicator (on-planter). Equipment manufacturers should be consulted
 as to the suitability of individual machines for use with Monceren and the appropriate machine setting to ensure the correct application rate relative to tuber size is achieved. This method of application reduces risk of operator exposure. Team now offer applicators to fit all makes of cup and belt planter and Monceren treatment is programmed into the current Digimon control version 4.1b.

Bulk box application

Before tipping the seed tubers into the planter hopper Monceren may be applied either by scattering the total amount required to treat the bulk load of seed tubers over the surface of the tubers in the full container, or by using the ‘sandwich’ technique described above under ‘Hopper application’.

Note: this method of application can result in some staining of the bulk box inside surfaces. Consequently, ware tubers should not be stored or supplied to packers in such stained boxes.

Chitting trays

The appropriate amount of Monceren can be sprinkled evenly over seed tubers in chitting trays before loading into the planter.


If seed tubers become damp from light rain, the distribution of Monceren on the tubers at planting should not be affected. If, however, a rain shower interrupts planting, the tubers in the hopper should be covered in accordance with normal practice.


Potato planting is a dusty operation, particularly in windy weather. The use
of Monceren may add to this problem and operators must wear a dust mask (conforming to EN 149 FFP2 or EN 149 FFP3) when handling the powder formulation, including applying the dust to the potatoes, filling the hopper and when riding on the planter.

Seed quality

Growers are advised to carefully check seed tuber health before applying Monceren. 
Potato seed tubers to be treated with seed treatments, including Monceren, should be of good quality and vigour (i.e. free from conditions such as bacterial rots, physical damage, virus infection, etc.). Crop establishment may be impaired where seed is affected by the conditions above irrespective of any subsequent seed treatment application.

It is Good Agricultural Practice to allow seed tubers coming out of cold store to achieve ambient temperature before planting in to cold and / or wet seedbeds.

Tuber handling damage

Any damage occurring to tubers or sprouts/chits during handling, treatment or planting may adversely affect their subsequent performance and cropping

Other tuber treatments

Monceren should not be used on seed tubers, which have previously been treated with another dry powder seed treatment or where hot water treatment is used.

Check with Bayer or your supplier before use of any chemical sequence with Monceren at planting.

Use of treated tubers

Tubers treated with Monceren may be used only as seed. They must not be used for human or animal consumption.


Monceren is for use on all varieties of first and second earlies, main and seed crops.


Resistance Management

The possible development of disease strains resistant to Monceren cannot be excluded or predicted. Where such resistant strains occur, Monceren is unlikely to give satisfactory control. A strategy for preventing and managing such resistance should be adopted. Guidelines for fungicide resistance management are available on the FRAC website.



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