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: Leaf malformation may be associated with a disease caused by the Petunia vein clearing virus, which is the only species of virus in the Petuvirus genus.