N	Risk mitigation measure	Effect on the pest	Evaluation and uncertainties
1	Registration of production sites	Yes	As the plant passport is very similar to the EU one, the Acer plants shall be free from quarantine pests. Uncertainties: – None.
2	Physical separation	No	Not relevant. Physical separation is not a barrier for S. dorsalis because the adults can fly.
3	Certified plant material	Yes	The measure is effective against the pest. Uncertainties: – None.
4	Growing media	No	Not relevant. Scirtothrips dorsalis is not present in soil.
5	Surveillance, monitoring and sampling	Yes	Although the incoming plant material is thoroughly checked, later infestation by S. dorsalis can go undetected, because its small size. Uncertainties: – Capacity of detection of the pest on Acer plants.
6	Hygiene measures	Yes	Weeding can have some effect on the reduction of Scirtothrips populations. The other measures are not relevant. Uncertainties: – None.
7	Removal of infested plant material	Yes	Removal of generically damaged plants will reduce the probability of carrying S. dorsalis. Uncertainties: – None.
8	Irrigation water	No	Not relevant.
9	Application of pest control products	Yes	Chemical control measures adopted when the pest is found may have a substantial effect of pest suppression. Uncertainties: – Thrips are difficult to control with chemicals because of hidden habits and potential resistance.
10	Measures against soil pests	No	Not relevant.
11	Inspections and management of plants before export	Yes	Inspection should detect S. dorsalis as symptoms are clear. Uncertainties: – Capacity of detecting symptoms at low pest density.
12	Separation during transport to the destination	No	Not relevant. Acer plants are not individually separated during transportation. The pest can infest other plants carrying leaves.