Clayton Gatso™ – Updated Stewardship Guidelines: Oilseed Rape 2025

The stewardship guidelines for Clayton Gatso have been updated for 2025 and can be found below or click here to download a copy.

Clayton Gatso^™: Stewardship Guidelines: Oilseed Rape 2025

Permissible Tank Mixing

• Tank mixing with an insecticide for CSFB control is permissible if required.
• The addition of a non-wetted water conditioner (that has no built-in adjuvant) will improve efficacy in hard water areas and is strongly recommended.
• Tank mixtures with propyzamide can now be permitted and can also be additionally useful for grass weed resistance management purposes.

Prohibited Tank Mixes

• Do not mix with any adjuvants (Clayton Gatso already has a built-in adjuvant)
• Do not mix with any other products apart from propyzamide or an insecticide (but not both together).

Timing Restrictions

• From 2 true leaves of the oilseed rape crop.
• Do NOT apply after 15th October or crop growth stage ‘6 leaf’ (whichever comes first).
• No Spring applications.

No Spray Period

• A 10-day no spray period must be in place before application of Clayton Gatso.
• A 14-day no spray period must be in place after application of Clayton Gatso for other plant protection products.
• After 7 days, application of crop nutrition products and insecticides is permissible.

Condition Prohibition

• Do not apply in cold weather, especially when frosts may occur. Mean temperature should be above 7°C for application.
• Ensure the crop is showing no crop stress or signs of pest damage.
• Ensuring adequate crop waxing and sufficient crop nutrition will also minimise risk.

Best Practice

• Apply Clayton Gatso at 1.0 L/Ha in a minimum of 150L of water volume to ensure good uptake.
• Use drift reducing nozzles and apply in good spraying conditions, with a suitable forward speed to ensure good crop coverage. A water conditioner can aid application.
• Ensure Blackgrass has reached 3 leaves and is actively growing. Best coverage of weeds is required for optimum efficacy.
• Minimise spray overlap to reduce the risk of crop damage.
• In the event of crop failure following treatment with Clayton Gatso, ensure any survivors are over sprayed with glyphosate prior to sowing the next crop.

Resistance Management

• Strains of some annual grasses (eg Blackgrass, Wild Oats, and Italian Ryegrass) have developed resistance to herbicides, which may lead to poor control.
• A strategy for preventing and managing such resistance should be adopted.
• Guidelines have been produced by the Weed Resistance Action Group (WRAC) which should be referred to.
• This product contains clethodim which is an ACCase inhibitor, also classified by the Herbicide Resistance Action Committee as ‘Group A’. Use only as part of a resistance management strategy that includes cultural methods of control and does not use ACCase inhibitors as the sole chemical method of grass-weed control.
• It is recommended to adopt a long-term strategy integrating cultural and chemical measures.

The following are the key elements of the resistance management strategy:

• Always follow WRAG guidelines for preventing and managing herbicide resistant weeds.
• Maximise the use of cultural control measures wherever possible (e.g. crop rotation, ploughing, delayed drilling etc.)
• For effective resistance management, use tank mixes or sequences of effective herbicides with different modes of action within individual crops, or successive crops.
• To reduce the risk of developing resistance, applications of Clayton Gatso should be made to young, actively growing weeds.
• Monitor fields regularly and investigate the reasons for any poor control.

For any further information on Clayton Gatso, please contact:

William Ridgwell – Commercial Manager – will@claytonpp.com
Martyn Rogers – Product Development Manager – martyn@claytonpp.com