HVX what you need to know

Many hostas are turning up that are infected with a virus called Hosta Virus X (HVX). No hostas are immune to HVX.
 

While this disease does not kill plants, its primary danger lies in its proven ability to spread prolifically. Because symptoms may take years to show after infection, HVX has infected hundreds of thousands of plants and is at epidemic levels around the world. If a batch of hostas contains any individual plants that show HVX symptoms, the whole batch should be considered infected and should be destroyed, as individual testing is impractical and not a guarantee.

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More in detail info about HVX on AHS Here

note: there are 3 pages of photos on this link