A pesticide is adulterated in any of the following cases:
- (a) Its strength or purity falls below the standard or quality that it is represented to have.
- (b) Any ingredient that is necessary to its effectiveness has been wholly or in part abstracted or omitted in its manufacture, or other materials substituted for that ingredient.
- (c) It is intended for use on vegetation and contains any substance that is seriously injurious to vegetation, except weeds, if used according to the directions that are furnished with it.