California
FAC § 11403
“Pest control” means the use or application of any pesticide. It also means the use of any substance, method, or device to do any of the following:
(a) Control pests.
(b) Prevent, destroy, repel, mitigate, or correct any pest infestation or disorder of plants.
(c) Inhibit, regulate, stimulate, or otherwise alter plant growth by direct application to plants.