Pests and diseases can be carried on plants and trees, seeds, wood and wood products including wooden packaging material and isolated bark. They may also be carried on vehicles and machinery where they have not been properly cleaned and are carrying soil or plant debris. If you intend to export such material out of Great Britain to countries outside the EU you must comply with the importing countryâ€™s plant health regulations. The controls may require physical action by the exporter, such as removing plant debris from used forestry or agricultural machinery, or official inspection and certification. The information contained in this Guide details the application for phytosanitary certification procedures operated by the Forestry Commission.