The Tropical Fruit Forum

Just acquired 3 beautiful Meyer Lemon trees from a gentlemen who has been growing them for about 10-15 years.  He had a lot of citrus, many seed grown (these were not).   Two of the trees have what looks like variegation on the leaves, but its not truly variegated.  The gentlemen I bought them from thought it was a result of over-doing it with citrus fertilizer.   It doesn't look like its burnt to me, but I am still a citrus novice.  I do grow a lot of aroids, though, and this discoloration in an aroid woudl raise concerns about virus, especially Mosaic.

Any ideas?  Not all leaves are this way, and I can't really discern a patter (new growth vs. old growth, etc).  You'll notice in the photos that some leaves on the the same branch alternate the discoloration.  Any help or guidance is appreciated!  I've spent last night researching citrus illnesses and can't say I've found any smoking gun.  Thanks in advance.