The invention disclosed in this application relates to a device for detecting stored grain insects in bagstacks which comprises a main hollow tube having a diameter in the range of 1.8 to 2.0 cm (I) with equispaced perforation in the range of !.8 to 2 mm on its upper portion with a bend (2) at one end which ends in a transparent collection unit (3) to collect the insects falling down from the bend, the other end of main tube (4) being closed.
