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A pre-emergence herbicide for the control of annual broad leaved weeds in potatoes.

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What is Emerger?

A pre-emergence herbicide for the control of annual broad-leaved weeds in potatoes.

Product Profile

Active substance 600 g/L aclonifen
Formulation Suspension Concentrate (SC)
Pack Size 10 Litres
Water Volume
200-400 L/ha
Buffer Zone DRT – see below
MAPP 19056

Important Information

Crop Potato
Max. individual dose 1.75 L product/ha
Maximum number of treatments 1 per crop
Latest time of application
Before crop emergence
Aquatic buffer zone distance 6 metres
Other specific restrictions This product must not be applied via hand-held equipment

*Emerger also has a wide range of EAMUs (see When and How to Apply).

Aquatic buffer zone

To protect aquatic organisms, respect an unsprayed buffer zone to surface water bodies as specified for the crop.

Horizontal boom sprayers must be fitted with three star drift reduction technology. Low drift spraying equipment must be operated according to the specific conditions stated in the official three star rating for that equipment as published on HSE Chemicals Regulation Division’s website. Maintain three star operating conditions until 30 m from the top of the bank of any surface water bodies.

Do not allow direct spray from horizontal boom sprayers to fall within the distance specified for the crop to the top of the bank of a static or flowing water body, or within 1 m of the top of a ditch which is dry at the time of application. Aim spray away from water.

Buffer zones of more than 5 m cannot be reduced under the Local Environment Risk Assessment for Pesticides (LERAP) scheme.




Why you need Emerger

  • Emerger is a bleacher with a novel mode of action
  • Consistent performer for pre-emergence weed control
  • Effective against a wide range of annual weeds
  • Activity against grass and broad-leaved weeds
  • Emerger will be a key herbicide for the potato crop

In trials it has shown high levels of activity against nettles, polygonums, brassica weeds (charlock, runch, volunteer OSR and shepherd’s purse), Chenopodium weeds (fat hen and orache) and made a good contribution on grass weeds.


When and how to apply

Weeds controlled

Emerger is absorbed primarily through the shoot of emerging seedlings as they grow through the layer of herbicide applied pre-emergence to the soil surface. Susceptible weeds can emerge, but these will become chlorotic, their growth will be retarded leading ultimately to death.

After pre-emergence application do not disrupt the herbicide layer. Any form of mechanical cultivation or disruption of the soil surface by any other method will reduce the level of weed control provided.


The following annual weeds will be controlled by a pre-emergence application of Emerger at 1.75 L/ha:

Pansy, field Moderately susceptible
Bindweed, black Moderately susceptible
Fat-hen Susceptible
Mayweeds Susceptible
Redshank Moderately susceptible

Trials have also shown activity against:

Amaranthus Parsley piert
Annual meadow-grass Pale persicaria
Annual sow thistle Polygonums
Charlock Poppy
Chickweed     Scarlet pimpernel 
Corn spurrey  Sherpherds purse 
Dead nettle Small nettle 
Fat Hen Sun spurge 
Field penny cress Volunteer oilseed rape 
Knotgrass Wild radish

Established broad-leaved weeds growing from rootstocks will not be controlled by Emerger. As for other residual herbicides application to a fine, firm seedbed will optimise efficacy. Efficacy will be reduced where application is made to cloddy seedbeds or where there is disruption of the soil surface after application.

2 kg/ha Artist + 1.75 L/ha Emerger is a very robust tank mix that will provide all round control of potato weeds. Emerger bolsters the broad-spectrum weed control of Artist and provides additional activity against high polygonum pressure.


Emerger may be used on all commercial varieties of potatoes


Ridges should be well rounded with few clods. Cultivations should produce a soil tilth that requires no further improvement after planting. Cultivation after spraying will encourage weed germination and reduce the residual activity of Emerger.

Ensure Emerger is applied evenly overall to both sides of potato ridges. Care must be taken to ensure that application takes place before crop emergence.


On mineral soils with a high organic matter content and on peaty or organic soils the residual activity of Emerger may be reduced.

Following crops and crop failure

After a potato crop treated with Emerger, oilseed rape, field pea, dwarf french bean, wheat, barley, oat, winter triticale, winter rye, sugar beet, maize, and sunflower can be established in the normal rotation or in the event of failure of the treated crop, provided that cultivation (using cultivator, disc harrow or similar) and thorough mixing of treated soil has been conducted to at least 10 cm depth.

Radish and phacelia require a period of at least 120 days after application, or plough to at least 20 cm before drilling.

EAMUs – Vegetable and herb crops

Emerger has EAMUs for a wide range of vegetable and herb crops.


Maximum individual dose

Maximum number of treatments

Latest time of application

EAMU number

Carrots, parsnips and root parsley

1.75 L/ha


Prior to crop emergence

1601 of 2019

Garlic, onion and shallot

1616 of 2019

Caraway, dill and parsley

1617 of 2019


In all crops/situations a 6m aquatic buffer zone must be observed (see What is Emerger)

The use of Emerger on crops grown from seeds requires extreme caution as damage may occur if cool and wet conditions occur after application.

Emerger needs to be applied uniformly to an even, friable seedbed to form a consistent film. Uptake is by shoots not roots; it enters weeds through the cotyledons or the coleoptile of seedlings. It does not stop weeds germinating, but affects sprouting weeds to a certain extent, depending on the seeds’ internal resources, speed of growth and volume of active substance absorbed.

Typical symptoms of Emerger are chlorosis and necrosis on the tissues of young, emerging sprouts and shoots. Later, weeds stop growing and perish. As Emerger is not taken up by plants’ roots, it is not absolutely dependent on soil moisture and temperature at the time of use. It remains active for 2-3 months.

After application do not disrupt the herbicide layer. Any form of mechanical cultivation or disruption of the soil surface will reduce the level of weed control. Follow normal drilling / planting and ensure the seed is well covered.

EAMU – Onions

The use of Emerger on crops grown from seeds requires extreme caution as damage may occur if cool and wet conditions occur after application.

EAMU – Carrots

Prior to the loss of linuron, the standard pre-emergence mix for carrots was pendimethalin + clomazone + linuron. In trials similar weed control has been seen where Emerger was swapped for linuron. In addition to its broad spectrum of control, carrot, parsnip and onion growers will benefit from its contribution to control of annual meadowgrass, knotgrass, charlock and cleavers and its activity on groundsel.



Resistance Management

When herbicides with the same mode of action are used repeatedly over several years in the same field, selection of resistant biotypes can take place. These can propagate and may become dominating. A weed species is considered to be resistant to a herbicide if it survives a correctly-applied treatment at the recommended dose. A strategy for preventing and managing such resistance should be adopted. This should include integrating herbicides with a programme of cultural control measures.

The latest guidance is available from the Weed Resistance Action Group (WRAG).



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