Where treatment of premises by spraying is carried out pursuant to the provisions of the Act, or these regulations, no person shall ¾

(a) do anything that an authorised person has specified in writing as being likely would adversely affect the result of the spraying; or

(b) unless an authorised person has, in writing, authorised the person so to do, within forty-eight hours after the spraying do anything whether by watering, digging in, top dressing or otherwise, that would adversely affect the result of the spraying.