Label changes for clopyralid on grassland


Labels for broadacre grassland products containing clopyralid will begin to change during 2022 and certainly from 1st January 2023. This update is happening to mitigte against the risk of herbicide residues ending up in manures and composts where they might be used where sensitive plants are grown.

Why change now?

  • More manure will be leaving farm of production for use elsewhere as interest in its use grows. For example, peat-based composts are being phased out and new raw materials are being substituted in such as animal manures.
  • Use of mulches and not digging in manures is practiced by a growing number of gardeners which can lead to longer break-down times of plant material and any clopyralid residues if present.


This change affects all products which contain clopyralid and have an approval for use on grassland.

Existing labels will permit sale and distribution up to 31st October 2022.

There will be a further 12-month period for “use” on farm up to 31st October 2023.

The updated labels will have a new MAPP number to help distributors manage old and new label stock.


Please review the key areas of risk mitigation below and follow them in 2022.

Thistlex® / Prevail®  / Pas®· Tor®  Agronomy Pack / Leystar® / Dingo®

Established Grassland:

  • DO NOT USE ON GRASSLAND that will be cut for animal feed (i.e. fresh cut grass, silage, hay and haylage), fodder or bedding nor for composting or mulching within one year of treatment.
  • DO NOT USE on grassland which will be grazed by horses and ponies.

Under no circumstances should manure resulting from the use of these products be supplied to gardeners or allotment holders, or commercial compost producers i.e. there must be no off-farm sale or supply, as sensitive plants may be affected by residues in the manure.

Leystar® / Dingo®

New Sown Leys

DO NOT make Hay, Haylage, Silage or Fresh Cut Grass if the resulting forage is going off farm.

  • If Hay, Haylage, Silage or Fresh Cut Grass is made and stays on farm then manure resulting from its use must also stay on the farm.
  • This manure must be returned back on to agricultural grassland, cereals or maize.