Sync iTunes WiFi doesn't see new Mac

I previously synced my Ipad with a windows based computer. A couple of months later, we replaced the computer with a Mac. When I go onto my IPad under Settings / General / ITunes Wi-Fi Sync / it still shows my apps as syncing with my old computer. Everything else on the IPad syncs properly with the new computer.

I connected the IPad to I-Tunes and checked "Sync with this IPad over Wifi", but that doesn't seem to have cleared it on the Ipad. Similar thing occurs with iPhone

Any suggestions on how to fix this? Thanks!