Hi Dave:
All parts of a virused plant contains virus. It is generally assumed
that pollen and ovules are virus free. What is normally virus free in the
bulb families we know is seed in which tissue multiplication is so fast that
virus has no time to infect it. Same with the meristems that produce virus
free tissue cultured material.
There is a lot of research on roses receiving PNRV in pollen carried about
by bees and other pollinator insects. As you say, in absence of all other
agents pollen is a possible one. Root nematodes are invisible vectors very
important in sandy soils and with excessive irrigation. This case is less
complicated to solve as the beds, etc., can be sterilized rather easily.
All the best
Alberto
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