The Director of Agriculture, and such officers, employees and deputies as the director assigns to such duty, shall visit the different parts of the state and shall see that all regulations of the State Department of Agriculture and all provisions of law to prevent the introduction or spread of fruit pests and diseases of trees or plants injurious to the horticultural interests of the state are enforced. The director forthwith shall, upon the complaint of interested parties, inspect or cause to be inspected by some officer, employee or deputy of the department, orchards, nurseries and other places suspected to be infested with fruit pests or infected with diseases injurious to trees, plants or fruits.