The purpose of fumigation is to destroy all stages of insects present in the material to be treated. An atmosphere that is toxic to insects will also kill rodents or other forms of animal life. Fumigation, will not eliminate mold or bacteria. Because there is no residual kill, insects or rodents may recontaminate the commodity immediately after fumigation. In order to protect stored foods a great emphasis must be placed on cleaning when sprays and fogs are used to eliminate insects.
Insecticides are useful tools when used with stack rotation and thorough cleaning.
Nothing takes the place of cleanliness. Insecticide sprays are applied to surfaces and will leave a residue that continues to kill insects that contact it. Be careful not to spray on product. Effective life of the residue depends on many things, including type of insecticide, surface to which it is applied, temperature, and humidity. Fogs and Mists.