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Velum Prime

Velum Prime is a true nematicide for use in potato crops. It contains a new mode of action and is based on liquid formation. It is applied in-furrow at the time of planting. Velum Prime offers improved ease of use and significantly lower dose rates than traditional granules.


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Control PCN for improved yields.

Managing potato cyst nematodes (PCN) is your first step to ensuring good marketable yields of high-quality crops. Without a host crop to stimulate hatching, nematode populations can remain dormat for decades, so it’s important to treat land at the start of each growing season. AHDB research suggests PCN can cause yield losses of up to 35% and - cost the sector an average £26m per year in lost output.


Always read the label before use.

What is Velum Prime?

A liquid nematicide for potatoes applied in-furrow at planting.

Product Profile

Active substance 400 g/L fluopyram
Formulation Suspension Concentrate (SC)
Pack Size 5 L
Water Volume
200 - 500 L/ha
Buffer Zone None
MAPP 18880

Important Information

Max. individual dose 0.625 L/ha
Max. number of treatments
One per crop
Latest time of application
At planting

Why you need Velum Prime

An easier way to treat PCN.

Protecting potato yields from the threat of PCN has just become a lot easier than ever before. From long-season processing crops to short-season salads, it is easy to protect crops thanks to Velum Prime's easy to handle packaging and no restrictive harvest interval. Velum Prime can be applied on its own or, where extra protection is desired, in sequence with a granular nematicide.

  • Easy handling – dramatic reduction in nematicide bulk and returnable packs
  • Easy application – just 0.625 L/ha applied in-furrow or an overall spray
  • Easy management – no harvest interval so easy to use on any crop type
  • Easy decision – make Velum Prime the core of your nematicide strategy

On every soil type, crop type and infestation level across Great Britain, Velum Prime has been shown to help protect yields and manage populations making Velum Prime an easy and effective part of an integrated pest management plan that will help maintain sustainable potato production.


The Proof

Population management

Managing PCN population is an important consideration for a sustainable rotation. Growing a potato crop can lead to an increase in egg count many times the initial population and they can remain viable for up to 40 years.

The effectiveness of nematicides in limiting an increase in population when a potato crop is grown is measured by the ratio of the final population (Pf) to the initial population (Pi). This was assessed across 26 UK trials conducted from 2012 to 2018 comparing the performance of Velum Prime (fluopyram) against Vydate (oxamyl) and untreated.

On average the population in the untreated controls increased fivefold, i.e. the Pf/Pi ratio was five. Velum Prime limited the Pf/Pi ratio to 3.7 giving an average reduction of 26%.


Yield protection

In lower pressure situations Velum Prime will provide yield protection and population management as part of an integrated PCN management plan. In higher pressure situations Velum Prime gives extra yield protection when used in conjunction with granular nematicides.

The graph below shows the performance of Velum Prime as a single means of yield protection and in combination with the granular nematicides, Nemathorin (fosthiazate) or Vydate (oxamyl) in 15 UK trials performed between 2016 and 2019. The results demonstrate the improved yield protection from applying Velum Prime in combination with a granular nematicide.


While use of a granular nematicide on its own gave a greater yield response than that achieved by Velum Prime applied alone, the use of Velum Prime in sequence with either granule at half-rate produced a yield increase beyond that achieved by that of the granular nematicide used on its own. The best result came from using Velum Prime plus half-rate Vydate: an average yield gain of 10 t/ha over the untreated.




When and how to apply

Pests controlled

Velum Prime is effective against both species of potato cyst nematode (PCN): Yellow potato cyst nematode (Globodera rostochiensis) and white potato cyst nematode (Globodera pallida). However, in soils with high organic matter, control of Globodera pallida may be less than that achieved in other soil types.


Apply Velum Prime as in-furrow spray, using on-planter application technology. It is important to direct spray into the planting furrow and not onto the seed tuber. Application should be made using two nozzles per row; one at the front of the planting share and directed down into the furrow and the second at the rear of the share and directed so to spray the soil as it closes around the planted furrow.

If the crop is intended for processing consult the processor before use.

Succeeding crops

Cardoons, celeries, Florence fennels and crops belonging to the category ‘other stem vegetables’ cannot be grown as succeeding crops.


Velum Prime may be used on all commercial varieties of potatoes. While no additional data (crop safety and efficacy) has been provided, crops grown under plastic can be treated at the grower’s risk.



Resistance Management

Velum Prime contains fluopyram (pyridinyl-ethyl-benzamide). As nematicides are not included in the mode of action classification scheme of IRAC, fluopyram is not assigned to any mode of action class by IRAC. However, fluopyram also controls certain plant pathogens and is classified by FRAC as a member of the Succinate-Dehydrogenase Inhibitor (SDHI) group of fungicides. A resistance management strategy in the crops where Velum Prime is applied also requires consideration of uses of other SDHIs for disease control.

Nematode Resistance

Velum Prime contains an active ingredient with a new mode of action for use as a nematicide. The resistance risk in nematodes is considered to be low based on experience of the use of organophosphates.


Where Velum Prime has been applied the first foliar fungicide application made to the crop must not be a member of the SDHI group.

See the FRAC SDHI Working Group for more information on SDHI fungicides



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