What is the difference between a Quarantine and Pre-Shipment (QPS) treatment and a Quarantine and Phytosanitary Treatment (QPT)?

Both treatments are executed the same way. QPS en QPT treatments are very often used for material in containers, crates and boxes and refer to wooden products and packaging material. The only difference is that goods after a Quarantine and Phytosanitary Treatment (QPT treatment) will be provided with a Phytosanitary Certificate, where goods of Quarantine and Pre-Shipment (QPS treatment may get this Phytosanitary Certificate as an option.