Police are investigating reports of off-road motorcyclists allegedly causing damage to land and crops in Pea cehaven and Piddinghoe.
Police said the downs around Hoddern Farm, Peacehaven, and the skate park and surrounding areas at Piddinghoe have been worst affected.
Police said there has been criminal damage to crops.
Police believe the perpetrators could either be local or come from further afield in vans.
Sergerant Kevin Leete, of the Lewes neighbourhood policing team, is asking the public to note and report details of anyone causing damage in the area.
Anyone who has any information about the matter is asked to contact Sussex Police on its non-emergency email and phone number email@example.com or phone 101.