Disclosed is an insect repulsion and/or barrier system (10) and a method for repelling insects (2) and/or for preventing insects (2) from passing through a defined opening (12) or surface (9). The barrier system (10) is equipped with devices (16) for preventing insects from passing through an opening (12) or for repelling insects when approaching the opening (12) and/or the devices (16). The devices (16) have at least two electrodes (18), whereby different electrical potentials are applied to or can be applied to the at least two electrodes (18). The at least two electrodes (18) are arranged within or on the edge of or outside the opening such that an electrical field (28) is formed between the at least two electrodes (18). The electrical field (28) rejects and/or repels insects approaching the electrical field (28) or prevents insects approaching the electrical field (28) from passing through the opening (12).