If upon examination as provided in section 4:7-7 of this title, the department shall find evidence of the presence of any disease dangerous to plants commonly grown within the state it shall at once notify the owner or manager of the nursery, establishment or place of the character of the disease and shall forthwith require the spraying, fumigation or other treatment necessary to free the plants of the disease.
The department may prohibit the shipment of any diseased or suspected plants until satisfied that the disease no longer exists in dangerous form.
If the department shall discover in a nursery, or elsewhere within the state, any plant infested with a virulent disease that cannot be eradicated by treatment, the department shall forthwith order it to be destroyed.