Inclusion in other EU ranking systems	PHRR, BiOR2, M&R
Need of automatic approach	Yes
Description	This criterion considers the list of host plants independently from the PRA zone and the importance of the host plant. A pest that attacks different genera and families is considered riskier than one with a smaller target population. The hypothesis is that pathogens that can attack many different host plants are more prone to infect new plant species in the same genus and/or family, thus allowing for more potential entry pathways via the importation of host plants.
Scoring	C	Indicator
	n	Number of families to which the host plants belong when there is more than one genus
	0.2	Host plants belong to a single genus
	0.1	Host plant belongs to a single species
	Score = C(indicator)
Data	List of host plants, taxonomy of host plants
Example	Meloidogyne chitwoodi has host species in 12 distinct genera (Avena, Beta, Dacus, Hordeum, Medicago, Phaseolus, Pisum, Scorzonera, Solanum, Taraxacum, Triticum, Zea) themselves corresponding to six distinct families (Poaceae, Amaranthaceae, Apiaceae, Fabaceae, Asteraceae, Solanaceae) = 6