No longer available. Please see alternative: Valdor Flex

Pacaya Flazasulfuron 50g - Herbicide

SKU: 188718

Sale price£70.25 ex. VAT
£84.30 inc. VAT
(minimum of 1)


Product Overview
Product Type Herbicide
Product Name Pacaya
MAPP No. 16797
Active Substances Flazasulfuron
Formulation Water dispersible granule
Areas of Use Natural surfaces not intended to bear vegetation, permeable surfaces overlying soil, hard surfaces (railway ballast only), amenity vegetation (around)
Amateur/Professional Professional
Phytomobility Residual
Mode of Action Group Inhibition of ALS

Unavailable. Please see alternative: Valdor Flex

Pacaya is a long-lasting herbicide which requires just one application per year.  

It is renowned for controlling several broad spectrum annual and perennial broad-leaved weeds and grasses on natural surfaces not intended to bear vegetation, permeable surfaces overlying soil, hard surfaces (railway ballast only), and around amenity vegetation. 

Once applied, this residual herbicide remains active on surfaces for up to 5 months and is suitable for use on several non-crop surfaces as well as around amenity vegetation.  

Pacaya prevents the emergence of susceptible broad-leaved and grass weed species. 

Please note that Pacaya does have a limited effect on very young weeds. It should be tank mixed with glyphosate for effective post-emergence as well as the long-lasting residual activity of Pacaya. 

For maximum results ensure that the surface is undisturbed after application. This will help the barrier effect created by Pacaya to remain active. This surface barrier prevents germination of a wide range of broad-leaved and grass weeds. 

A 50g bottle will treat an area of 3,333m² for up to 5 months. 

Target Species

Pacaya gives pre-emergence control by forming a surface barrier that prevents germination of a wide range of broad-leaved and grass weeds.

*A limited number of weed species are not effectively controlled by Pacaya (see label for further details).

Instructions for use

Where to use

Natural surfaces not intended to bear vegetation - Areas of soil or natural outcroppings of rock that are not intended to bear vegetation. 

Permeable surfaces overlying soil - Any man-made permeable surface (excluding railway ballast) that overlies soil and is not intended to bear vegetation. 

Hard surfaces (railway ballast only) - Any railway ballast impermeable surface that is not intended to bear vegetation. 

Amenity vegetation (around) - Any areas of semi natural or ornamental vegetation, including trees (see product label for susceptible non-target plants) 

When to use

For best results apply Pacaya in the early to late spring before weeds the have germinated. 

Application Window
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

How to use

Maximum Treatments Pack Coverage Application Method Application Rates Water Volume Spray Quality
1 per annum 3333 m2 Conventional knapsack sprayer
Vehicle mounted sprayer
150 g/ha 200-600 l/ha Medium

  1. Use clean water to half fill the spray tank. 

  2. Apply the required quantity of product. 

  3. Agitate the spray tank. 

  4. Fill the rest of the spray tank with water to top the mixture up. 

  5. Apply immediately. 

  6. Do not cultivate or rake the area following application. 

  7. Clean equipment with a diluted ammonia solution following use. 

Additional Information

Before each spraying operation please ensure that you carry out a Local Environment Risk Assessment for Pesticides (LERAP) in accordance with CRD’s published guidance.  

Only use Pacaya on natural or porous surfaces such as gravel or railway ballast surfaces.  

Ensure that the underlying surface is soil. 

Do not apply to non-porous man-made surfaces. 

Ensure the product does not come into contact with non-target plants. 

Do not apply near species that have been planted for less than 2 years. 

Do not allow direct spray to fall within 5 m (horizontal boom and train sprayers) or 1 m (handheld sprayers) of the top of the bank of any static or flowing water body. 

Active Substances


Bio-Chemical Mode of Action: Flazasulfuron belongs to the inhibition of Acetolactate Synthase (ALS) group of herbicides.

Acetolactate synthase is an important enzyme involved in the biosynthesis of branched-chain amino acids. ALS inhibitors interrupt this process causing the plant to initially become chlorotic before necrosis of plant tissues followed by whole plant death occurs.

Mobility: Flazasulfuron is a systemic penetrant which means that the active substance can be translocated downwards through the plant within the phloem (sugar conducting tissues) and upwards through the plant within the xylem (water conducting tissues).

Application timing: Residual ALS inhibitors are best applied prior to the emergence of weed species.

Resistance: ALS inhibitor herbicides pose a high-risk of resistance particularly for grass weed species including black-grass, Italian rye-grass and wild oats. To reduce the risk of resistance follow label instructions and rotate use with herbicides with differing modes of action.

For further information regarding Pacaya Flazasulfuron 50g, please contact our technical sales team on 01952 897917.

Find more information in our guide How To Know Which Herbicide to Choose

Technical Information

SKU Product File
188718 Pacaya Flazasulfuron 50g - Herbicide Safety Data Sheet (PDF)
188718 Pacaya Flazasulfuron 50g - Herbicide Product Label (PDF)

Safe use of pesticides

The purchaser and/or end users are responsible for ensuring that these products are used in line with industry Approved Codes of Practice. All operators must be trained and certificated in using and applying any Ministry Approved professional product.

Please be aware that by proceeding you are purchasing a professional pesticide product.

You must ensure the end user of these products complies with the DEFRA/HSE Code for the Safe use of Pesticides:

"By law, everyone who uses pesticides professionally must have received adequate training in using pesticides safely and be skilled in the job they are carrying out."

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