non-aroid question

A friend of mine asked for help identifying the disease on some of his plants.  (OK, all you folks from down south, I now expect a round of "why do you bother with those, we throw them away")

He brought home a few water hyacinths.  They were supposedly doing perfectly fine in the pond from which he got them.  He says that within just a couple days, the leaves began to turn white and all growth stopped.

Here's a photo of the dwindling plants:
http://home.att.net/~schale/bitmaps/hyac.jpg

Given the variegation (especially that on the two-tone leaf), I thought this might be a virus.  Does anyone out there have any other ideas?

Thanks,
        Les
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