Premise: Petuvirus is a genus of viruses, in the family Caulimoviridae. Plants serve as natural hosts. There is currently only one species in this genus: the type species Petunia vein clearing virus. Diseases associated with this genus include: plants: chlorotic vein clearing, leaf malformation.
Hypothesis: It would be completely ridiculous to say that Plants are kind hosts who have Caulimoviridae family over for dinner, because plants don't have dinner parties, and Caulimoviridae is a completely different kind of family.