The relationship between a nationally recognized milk producer and a milk substitute maker has soured.

The maker of the bottled milk, TruMoo, is suing the maker of milk substitute NuMoo, saying the dairy-free beverage's name is a trademark infringement likely to confuse customers. Dean Foods Co., which produces TruMoo, sued Harvest Beverage Group Thursday in the U.S. District Court of Connecticut.

The lawsuit lodges trademark infringement and unfair competition claims and alleged the defendant violated the Connecticut Unfair Trade Practices Act. The suit seeks a permanent injunction barring Harvest Beverage Group from using the NuMoo label, as well as actual, treble, punitive and exemplary damages.