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.
an estimated 500 plant species are susceptible to Petuvirus
the paragraph does not state how many plant species are affected
( z1 susceptible :ARG1 ( z2 species :quant 500 :mod ( z3 plant ) :ARG1-of ( z4 estimate ) ) :ARG2 ( z5 disease :name ( z6 name :op "Petuvirus" ) ) )