N	Risk mitigation measure	Effect on the pest	Evaluation and uncertainties
1	Registration of production sites	Yes	The risk mitigation measure is expected to be effective in reducing the likelihood of presence of the pathogen on the commodity. Uncertainties: – None.
2	Physical separation	No	Not relevant.
3	Certified plant material	Yes	The risk mitigation measure is expected to be effective in reducing the likelihood of presence of the pathogen on the commodity. Uncertainties: – None.
4	Growing media	No	Not relevant.
5	Surveillance, monitoring and sampling	Yes	This measure could have some effect. Uncertainties: – Whether symptoms caused by the pathogen on Acer are recognisable. – Whether Acer plants are subjected to annual surveys.
6	Hygiene measures	Yes	The desinfection of tools with appropriate product can prevent the spread of the pathogen within the nurseries. Uncertainties: – Specific product used for desinfection of tools.
7	Removal of infested plant material	Yes	This measure could have some effect. Uncertainties: – None.
8	Irrigation water	Yes	Overhead irrigation can increase the likelihood of spread of the pathogen by water splash. Uncertainties: – None.
9	Application of pest control products	Yes	Although C. parasitica is generally not a target of the pesticide treatments in the nurseries, some fungicides could reduce the likelihood of the infection by the pathogen. Uncertainties: – No specific information on the fungicides used. – The level of efficacy of fungicides in reducing infection of C. parasitica.
10	Measures against soil pests	No	Not relevant.
11	Inspections and management of plants before export	Yes	This measure could have some effect. Uncertainties: – Whether symptoms caused by the pathogen on Acer are recognisable.
12	Separation during transport to the destination	No	Not relevant.