Bitter rivals on store shelves in the candy aisle may also duke it out in court.

The Hershey Co. sued Mars Inc. this week. The maker of Hershey’s and Reese’s chocolate candies says the maker of Snickers, M&Ms and Dove candies is mimicking its packaging.
Hershey is claiming trademark dilution and infringement and unfair competition. It says packaging for the Dove line too closely resembles that of its Reese’s products.

Mars did not immediately respond to a telephone message Friday.

Pennsylvania-based Hershey is the second-largest U.S. candymaker. McLean, Va.-based Mars leapfrogged it when it bought Wrigley’s in 2008.