Abstract
An actograph based on an infrared (IR) emitter-detector pair is described for studies of single insects. The device is activated when the infrared beam is suddenly interrupted by the insect's movement. This actograph is insensitive to slow changes in light intensity such as dawn and dusk and can be used under naturally changing photoperiods. This device is economical, dependable, and detects flight activity of insects as small as 1 mm diam.
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