The State Entomologist or his assistants shall, upon application, inspect at least once each year all nurseries at which woody field-grown hardy trees and plants are grown for sale or shipment; may inspect any nursery stock when dug, before shipment or at destination; may inspect nurseries at any time for the purpose of controlling plant pests or to ascertain whether such pests exist in nurseries; may prescribe forms for registration, certificates and permits and may make regulations regarding time and methods of inspection; may destroy or treat or order the destruction or treatment of, and prohibit the movement of, plants infested with dangerous pests; may cooperate with agents of the United States Department of Agriculture in the inspection of nurseries and control of plant pests; may, at reasonable times, enter any public or private grounds in performance of his duties under the provisions of this section and sections 22-99 and 22-100. If orders are issued for the destruction or treatment of infested plants, the owner, manager or agent of the nursery shall, within a reasonable time from the date of such order, destroy such plants as are ordered destroyed and make such treatment within the time specified in the order or be subject to the penalty provided in section 22-101.