The International Plant Protection Convention (IPPC) is an international plant health agreement, established in 1952, that aims to protect cultivated and wild plants by preventing the introduction and spread of pests. The IPPC produces International Standards for Phytosanitary Measures (ISPMs).
ISPMs are the standards, guidelines, and recommendations recognized as the basis for phytosanitary measures applied by Members of the World Trade Organization under the Agreement on the Application of Sanitary and Phytosanitary Measures (the SPS Agreement).
Weyerhaeuser Products are in accordance with these standards. Below is a link that explains in depth the standards that are followed.