The official licenser of Pink Lady apples marketed in the U.S. is warning consumers not to buy fruit that hasn’t been trademarked.

The “vast majority” of Pink Ladys marketed in the U.S. this season have met trademark standards, but enough un-trademarked Southern Hemisphere fruit has been imported to cause concern, Alan Taylor, marketing director for Wenatchee, Wash.-based Pink Lady America LLC, said in a news release.

Pink Lady America is asking consumers to purchase only apples that clearly display the Pink Lady trademark on Price-Look-Up stickers at retail, and to make sure that the trademark matches the Pink Lady name on the retail display.

“Consumers need to be assured that they are buying true Pink Lady brand apples that meet their expectations,” Taylor said.