Health requirements for plant propagation material
Plant propagation material must not host quarantine pests or diseases. Quarantine pests and diseases hosted by outdoor garden plants include fireblight ( Erwinia amylovora), ramorum leaf blight ( Phytophthora ramorum) in rhododendron and red stele ( Phytophthora fragariae var. fragariae) in strawberry. Quarantine pests and diseases hosted by greenhouse plants include the sweet potato whitefly Bemisia tabaci and a number of viruses. Further information on quarantine pests and diseases hosted by plants is available on this site at Cultivation and production > Plant diseases and pests > Quarantine pests and diseases.
Except quarantine pests and diseases, plant propagation material offered for sale must not host any other harmful organisms that might affect the quality and usability of the plant. Furthermore, plant propagation material must not contain creeping yellow-cress ( Rorippa sylvestris) or significant amounts of other perennial weeds.