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Roundup Hub

Roundup Use

The Roundup Brand was born in 1974. Since then products based on glyphosate have become the most widely used herbicides in the world. The benign nature of the molecule to operators and the environment combined with excellence in weed control make it first choice for non-selective weed control.

Mode of Action

Once applied to the leaf uptake occurs within 1-6 hours and glyphosate moves through the phloem both downwards and upwards within 5 days. It tends to accumulate in the growing points, then evens up throughout the plant, leading to a gradual loss of green colour followed by death between one and four weeks later.

Glyphosate works at a single specific site in the Shikimic acid pathway to inhibit the production of the amino-acids phenylalanine, tryptophan and tyrosine. Amino- acids are the building blocks of protein molecules and once the biochemical pathway is blocked the synthesis of proteins is interrupted and the plant effectively starves to death. The process is temperature related and explains why treated plants take some time to die.

Environmentally Friendly

This metabolic pathway is present only in green plants. Higher forms of life like mammals, birds, fish and insects are dependent on plant sources to obtain these three amino-acids in their food and neither absorb nor metabolise glyphosate. This is the reason Roundup has such environmentally friendly characteristics.

No other class of commercial herbicide is known to target this site (HRAC group G).

Glyphosate Formulations

All glyphosate products are not same. While they all contain the active ingredient, glyphosate, the formulation type in which the glyphosate is carried plays a major role in performance.

Our formulation chemists have worked continually since the launch of Roundup to bring out new formualtions with improved weed control, leass restrictive conditions of use and better safety profiles under COSHH.

Modern formulations of Roundup are highly active and provide the highest levels of uptake and translocation leading to improved speed, rain fastness and efficacy.


Find out more:



Attention to detail is essential for resistance management

Applied correctly, glyphosate as a non-selective herbicide can deliver very high levels of weed control. As such, it has become one of farmers’ most trusted weed management tools. However, experience around the world shows that glyphosate is not invincible, weeds can develop resistance to it.

Fortunately, there are no known cases of glyphosate resistance in the UK but weed biologists agree that the risk is there. Once weeds become resistant, there is no cure, so taking steps to reduce the risk is essential for farmers to retain this versatile and highly effective herbicide.

In 2021, the Weed Resistance Action Group (WRAG) published updated guidelines to minimise the risk of glyphosate resistance developing in the UK. This booklet guide builds on their recommendations and Bayer’s expertise with Roundup (glyphosate) products to give farmers and agronomists an effective framework to ensure the long-term efficacy of glyphosate.


Best Practice

All agrochemicals need particular weather conditions, good application technique and target weeds in a receptive condition to achieve the best results. Factors affecting the performance of Roundup are detailed in this section to help achieve the very best results every time it is used.

Use the links below to navigate to the appropriate section.

Best Practice Information:


Understanding Pesticide Labels

The Importance of Statutory Conditions and Fields of use Within the Law

Everyone who uses pesticides referred to as Plant Protection Products, (PPP) should abide by the Code of Practice for using plant Protection Products 2006 (COP). It has legal status and by following the advice you will be within the law. Both The Food and Environment Protection Act 1985, (FEPA) and the Health and Safety at Work Act, 1974 apply to the use of PPP.

The Importance of the Label

The COP is very specific about the need to follow the label as a whole and comply with maximum dose rates, maximum number of treatments etc. Labels now carry this statement:


Use of a PPP against the label or the approval automatically results in failure to meet the Statutory Management Requirements under EU rules for farm payments.

Fields and Conditions of Use

All approved pesticides have fields of use listed on the label. The conditions of use must be followed in order to remain within the law and are listed prominently under the product name e.g.


Products which are approved for agriculture and horticulture should not be used in Industrial and Amenity situations unless they are also listed.

The details are listed below the main heading under CROPS/SITUATIONS. It is not always obvious what these crops/situations are so it is vital to make sure you understand before you use a PPP for a situation which is not included on the label. These are all defined by CRD in the Crop hierarchy (Last revised in 2006) which can be downloaded from the CRD website

The information is also in the Code of Practice for using Plant Protection Products on p16,17 table 1.

Example of Fields and Conditions of Use: Roundup Energy label




  • Wheat, (including Durum wheat), barley, oats, combining peas, vining peas, field beans;
  • Oilseed rape, mustard, linseed;
  • Sugar beet, swedes, turnips, bulb onions, leeks;
  • All edible crops (stubble), all non-edible crops (stubble);
  • All edible and non-edible crops (destruction, before sowing/planting);
  • Grassland;
  • Apples, pears; plums, cherries, damsons;
  • Green cover on land not being used for crop production;

CRD Crop Hierarchy Definitions

Most specific crops listed are self explanatory. However there is sometimes confusion over plant-free areas.

Natural surfaces not intended to bear vegetation. Areas of soil or natural outcroppings of rock that are not intended to bear vegetation, including areas such as sterile strips around fields. May include areas to which the public have access. It does not include the land between rows of crops.

'Green cover on land not being used for crop production' comes under the agricultural/horticultural heading in the crop hierarchy and does not include industrial or amenity situations.

Areas of land with a vegetation cover that have been removed (temporarily or otherwise) from production. For example some types of set aside. Includes fields or non-crop field margins covered by natural regeneration or by a planted green cover crop that will not be harvested.

Does NOT include use in industrial crops or inter-row use within a crop (edible or non-edible).

Other Plant-free areas with industrial and amenity approval are Permeable surfaces over lying soil or hard surfaces.

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

Hard surfaces: Any man made impermeable surface, such as concrete or asphalt and including railway ballast, that is not intended to bear vegetation.

If the situation you intend to use a PPP for is not listed on the product label, then you cannot follow label instructions and comply with the law. You may need to choose a different product which does carry the intended use.

Crop Specific Information

Detailed information is given in a further table on Maximum use rates, number of treatments & other specific restrictions.

Crops or situationsMaximum individual dose (litres product/hectare)Maximum total dose(litres product/ hectare/ crop or situation/ annumLatest time of application
Winter wheat, winter barley, winter oats, spring wheat, spring barley, spring oats, durum wheat, combining pea, field bean 3.20 3.20 7 days before harvest
All edible crops (stubbble),
all non-edible crops (stubble)
4.0 or 1.2 4.0
5 days before drilling or planting the following crop
2 days before the drilling or planting of the following crop or 24 hours before cultivation
All edible and non-edible crops (destruction, before sowing/planting) 4.0 - -
Grassland 4.8 4.8 5 days before harvest, grazing or drilling
Green cover on land not being used for crop production 4.8 4.8 24 hours before cultivating


Each line in the table represents a new situation and where more than one situation occurs for the same crop it can be sprayed once for each situation. For example in winter wheat you can apply up to 1.2l/ha of Roundup Energy post planting, but before emergence, then up to 3.2l/ha before harvest and up to 5l/ha in the autumn on the stubble.

The Maximum individual dose rate is simply the highest dose you can apply at any one time. The maximum individual dose rate will vary according to the particular use e.g you can apply Roundup Energy at up to 4.8 l/ha on grassland, 3.2l/ha pre-harvest of wheat or 1.2l/ha post planting, pre-emergence of listed crops.

A maximum number of treatments may be specified under the ‘Maximum number of treatments per year’ column for some products. We use a Maximum total dose wherever possible which allows flexibility to split into any number of treatments.

Water volumes in which the product can be applied may also be restricted. Instructions will be given on the label eg Apply in 80-250l/ha of water. In some cases this can be reduced, but the rules are complicated and often do not apply to knapsack use. (See para 4.6.4 COP).

Always read the label carefully and comply with all the label instructions.

Failure to follow label restrictions could result in prosecution.


Roundup Agriculture

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Knowledge Hub

Herbicide Resistance

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Five Reasons to resistance test black-grass and ryegrass and how to do it

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Why diversifying herbicide modes of action is crucial

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How previous seasons’ weed control can inform your approach this autumn

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Review herbicide options for effective weed control

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Effective control of black-grass essential before winter wheat

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Grassweed Species Categories

Patch Spraying



Patch spraying is a useful tool in the control of difficult weeds that have evaded the cultural and chemical controls used as part of an integrated management plan. It is an aggressive measure but will help as part of an overall strategy to control the weed and preserve yields longer term.


Continue Reading


Harvest Managment



A guide to the timing of Roundup for harvest management applications in OSR and cereals


Read the guide here


Grassland Reseeding


Rather than making grass leys last longer, consider reseeding to boost both yield and quality of home grown fodder. New swards produce an average of 25% more dry matter in the first year alone.

Continue Reading



Bracken Control



Bracken (Pteridium aquilinum) is widely distributed throughout the UK being by far the commonest fern. Bracken is reported to cover over 8% of the country, an area of 11,000 At 1-3% per year the rate of spread is faster than all the programs in place to control it, and it is encroaching on to grazing ground, forestry and amenity areas, reducing bio- diversity.


Continue Reading


Making the Most of Grassland Reseeding with Roundup


Reseeding is one of the most cost effective investments that can be made on a grassland farm. Deciding when to re-seed an old sward or pasture can be difficult, and in some cases may not be necessary with rejuvenation or renovation being most cost effective. Read on to find out more.

Download the booklet here


Glyphosate Stewardship


Applied correctly, glyphosate as a non-selective herbicide can deliver very high levels of weed control. As such, it has become one of farmers’ most trusted weed management tools. However, experience around the world shows that glyphosate is not invincible, weeds can develop resistance to it.

Download the booklet here



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