Larval tray with cover. Trays can be used to rear any kind of insect i.e both aquatic and terrestrial ones. For example, mosquitoes and dipteran flies. The cover is made of cloth and nylon net which prevent escape and entry of smallest of the insect. The aperture openings of the mesh is 150 x 150 grids per inch which turns out to be 150 micron opening. The mesh is sufficiently open enough to allow exchange gases that emanates from the larval environment.