The answer:
The EPA defines disinfectants as antimicrobial pesticides, whereas a common pesticide is used to control insects and rodents without regard for bacteria, viruses and other microorganisms.
The official definitions are:
Disinfectant - A chemical that destroys vegetative forms of harmful microorganisms, but does not ordinarily kill bacterial spores.
Pesticide - Substances intended to ... — Lynn E. Krafft, ICAN/ATEX associate editor
