Can we draw the following hypothesis from the context? 

Context:

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: Petuvirus was brought to america by fur traders
It's impossible to say