Abstract: This invention is a chemical applicator apparatus normally secured to an auger conveyor to discharge a controlled amount of chemical or other substance to the material being conveyed into a storage bin to prevent insect damage. The chemical applicator apparatus includes (1) a main housing means to hold the chemical or other substance therein; (2) a main drive means secured to the main housing means; and (3) an actuator and discharge means connected to and operated by the main drive means. The actuator and discharge means includes (1) an actuator assembly to agitate and compact a portion of the chemical or other substance contained therein; (2) a sprocket and chain assembly driven by the main drive means adapted to receive and convey the compacted portion of the chemical or other substance to a discharge area for positive injection into the auger or other type conveyor.