The feeding behaviour of adults of Otiorhynchus singularis was studied on raspberry canes in the laboratory using a video camera and infra-red radiation. Little or no activity was observed during periods of simulated daylight. Weevils spent most of their time searching and fed for only a short time when the dark period was from 0600 to 1200 h Coordinated Universal Time (UTC), but when the dark period was 1800-2400 h UTC, prolonged feeds were observed. Freshly wounded raspberry leaves had a repellent effect which was discernible for up to 11 h.