Table 4.

Evaluation of the respective control measures and identified needs for clarification from the expert interviews made in Germany.

Control measure	Evaluation	Quotation
Evaluation of the respective control measures
EO	Less convincing measure and hardly practicable implementation perspective	It won't work to ask an older woman to bring a bottle of lavender oil and always put a drop inside… But I do have my cent in my wallet Everything that costs money will not be made
Bti	Is largely rejected	I mean, if you can’t do it in a biological way, then you shouldn’t do it at all. We have a huge loss of songbirds anyway
Eurocent coins	High potential for implementation; however only a part of the cemetery visitors seemed to be motivated	People get rid of the stuff they unnecessarily have in their wallets

Topic	Quotation
Identified needs for clarification
Public relation and information	This requires a clever, broad-based image campaign, and educational work must be carried out. But of course this is a tough undertaking If I transport this accordingly in the media, then the willingness of people will also increase. Especially in the cemetery area I have to inform the older people and they have to be informed with normal media like newspapers and not over the internet. A 70-year-old grandmother who puts a bouquet on her husband's grave then read in the newspaper that she had to put a cent in it, and then she does
Actual efficacy of the substance	I can’t imagine it working
Dose and concentration	How many coins in what time intervals?
Side effect of copper coins e.g. on cut flowers, soil, planting, other organisms such as birds and squirrels	If then the bouquet lasts only one or two days instead of one week…

Quotations indicate direct remarks from the CATI partners. EO: Essential oil. Bti: Bacillus thuringiensis israelensis.