As used in this chapter:
"Class A noxious weed for eradication " means a noxious weed determined by the department to be the highest priority for eradication of existing infestations and prevention of new infestations.
"Class B noxious weed for control" means a noxious weed determined by the department to be a priority for preventing new infestations and stopping the spread of the species.
"Sterile " means any plant or variety that is incapable of reproduction or which is either noninvasive or nonaggressive in that the plant does not spread into areas where it was not initially planted.
Iowa Admin. Code r. 21-58.1