Insert block in the trap through a rectangular slot provided on 2 sides of the trap. Block consists a handle made of plastic string. Handle is to be taken out of the trap through a hole provided on the top of the trap and to be hanged at the twig of the tree at a height 5-10 feet above the ground. For crops other than tree crops, trap height may be kept 2-3 feet above the ground. As soon as the traps are filled with fly catches, they are emptied just by opening the bottom of the traps and are locked again for further catches.