Racing at Epsom scheduled to take place on Thursday has been cancelled due to problems with the racing surface.
Clerk of the course Andrew Cooper reported chafer grubs, which are the larvae of the chafer beetle, to be the concern.
He said: “We’re very disappointed to lose the fixture. This is a problem that can arise overnight and was identified earlier today (Monday) during a routine walk of the course ahead of racing on Thursday.
“We immediately contacted the BHA Senior Inspector of Courses, Richard Linley, who inspected the course late afternoon. We agreed it was necessary on safety grounds to abandon this week’s racing.
“We will immediately commence remedial works on the affected areas and in due course review the raceability of this season’s one remaining fixture on September 30.”
Epsom said customers who purchased tickets will receive an automatic full refund to the card used for payment.