As food handling areas, bakeries should be treated with sensitive products such as botanicals and insect growth regulators (IGRs). Spray products, such as Essentria® All Purpose Insect Concentrate, throughout exposed food and non-food areas, as well as in cracks and crevices, niches, dark corners, drains and other harborage sites. For drains, apply insect growth regulators, such as Gentrol® Aerosol, into and around the downspout and catch basin area. Because fly larvae develop in the scum buildup on the sides of drainpipes, it is important to coat these areas thoroughly. For heavy infestations, most applications can be repeated every two to four weeks.