Abstract: The invention relates in general to weed and trash screening apparatus for irrigation systems. In one embodiment a debris screening apparatus is provided for use adjacent a check structure in a canal having a flow of water. The preferred apparatus comprises a frame substantially open to the flow of water and adapted to abut the check structure and a screen having at least one face with a plurality of pleats. The screen is mounted within the frame and, during operation, a first portion of the screen is submerged within the water, a second portion of the screen is above the water and a portion of water in the canal is directed through the screen. Screen face cleaning means are operable to periodically clean debris off of the screen's at least one face.