You know, I checked the Butterflies & Moths-Georgia and it didn't list Sycamore specifically (they do list a lot of host plants) but the Tigers in California do (they use Platanus racemosa, for one, which is the California Sycamore) and they utilize a similar list of plants so I would wonder if perhaps the Eastern Tiger would as well...

Hey y'all,
I have plenty of Tiger SWT's here, but I also have a few huge Tulip Poplars on my property..that is what they use around here as a host plant..
Butterfly-Greetings
Susanne(SUE)

Red, our eastern tiger swallowtails use a greater variety of trees than any other swallowtail that I know of, so I looked through my books, but sycamore/Platanus wasn't listed. In Southeast Mississippi, they use wild black cherry/Prunus serotina and tulip tree/Liriodendron tulipifera about 95% of the time - I've found a few caterpillars on my Ptelea trifoliatas in years past.
Sherry

I thank yall very much. There is just one popular on our old home place. But pleanty of wild cherry. I might buy some popular this winter. Red