Acelepryn EA for chafer grubs adds extra areas for protection

Product Update
May bug cockchafer

An Emergency Authorisation (EA) for the use of the Syngenta insecticide Acelepryn to target chafer grubs has been granted for the 2022 season. The new EA now includes first-class cricket outfields, as well as specific areas of golf courses, racecourses and airfields. 

This season, the chafer grub authorisation permits use of Acelepryn up to 28 August 2022 – to cover key periods of adult chafer egg laying and target early larval activity in the soil.

Chafer grubs cause damage to turf through extensive feeding on roots, which can be severe in localised patches. Surface stability where grubs have chewed through turf roots is of hugely significant concern for racecourses.

Juvenile chafer grubs

Furthermore, extreme damage can occur in all turf surfaces when badgers, birds and other foragers root through turf in search of the grubs. The EA permits application in situations where there is an acknowledged instance of economic damage, or risk of bird strike on airfields, and where the product has been recommended by a BASIS qualified agronomist.

Subject to specific conditions, areas permitted for Acelepryn use cover affected areas of golf course greens, tees and fairways, horse racecourses and gallops, airfields and first-class cricket outfields under exceptional circumstances. The EA was applied for and held by ICL.

Acelepryn users will be required to submit online stewardship records of areas treated, linked from the ICL website.

Acelepryn stewardship form link

“Over recent seasons the damage by soil pests has been of increasing concern,” reported Syngenta Technical Manager, Sean Loakes.

“Obtaining this EA enables turf managers to develop an integrated turf management programme to tackle the severe effects of these pests.”

Further trials are underway on golf courses and fine turf surfaces to refine the application timing, along with aeration practices and the potential to use Acelepryn in conjunction with effectively targeted nematode treatments.  

Sean Loakes

Sean (above) advocates the best results have been achieved with applications at the peak flight of egg laying adults, for the product to be in the soil zone to target early feeding larvae.

“The on-line Pest Tracker reporting system provides a picture of pest activity across the UK and Ireland, to better aid application timing."

“Keep surfaces irrigated where possible prior to application, to attract pest larvae to towards the surface,” he advised.

“It’s important to ensure the soil profile is not hydrophobic at the time of application. Apply at higher water volumes, above 600 l/ha, using the white O8 XC Nozzle to help the spray reach the soil surface.”     

A further EA has also been submitted by ICL on behalf of the turf industry for the treatment of leatherjacket infestations later in the season. The regulatory system only permits a 120-day use period - which requires a separate submission for leatherjackets, to target later application at peak pest timing.

An on-line turf pest ID guide, to aid the identification of adult stages of key soil pests and target application timing, is now available on the Syngenta Turf website.

For further information on best use guidelines where chafer grubs and leatherjackets have caused economically damaging effects contact an ICL Area Manager or BASIS agronomist:

ICL Area Managers for Acelepryn enquiries:


Jamie Lees

07500 992464


Craig Lalley

07824 528252


Emma Kilby

07748 111965

South East/East London

Andrew Pledger

07387 056659

South Central

Martyn Parrish

07900 666691

South England / Wales

Nick Martin

07900 666691


Matt Nutter

07810 656240

North West

Phil Collinson

07824 473699

North West

Rob Ainscough

07823 894581

South West

Liam Rowlands

07824 473699

Northern Ireland

Colman Warde


Northern Ireland

Fergal Greenan

+353-86-054 2566

Alternatively contact Syngenta UK Technical Manager:

Sean Loakes

07831 161912