The company has announced four plant closings in the past six months.

MINNEAPOLIS — General Mills, Inc.’s restructuring efforts continue as the company announced plans to close two plants in Midland, Ont., and New Albany, Ind., in a Jan. 8 filing with the U.S. Securities and Exchange Commission. The two closings combined will reduce the company’s workforce by 500.

Citing a need to reduce refrigerated dough capacity, General Mills said it will incur restructuring charges of approximately $109 million if both restructuring efforts are completed. The New Albany plant manufactures refrigerated goods and employs approximately 400. The company called its decision to close the New Albany plant, which has a unionized workforce that is represented by the Bakery, Confectionery, Tobacco Workers and Grain Millers International Union, “tentative” and said it will enter into negotiations with the union. If the closing is completed, General Mills will incur charges of approximately $88 million.

The Midland plant manufactures frozen pizzas, refrigerated dough, cookies and other products for distribution in both the United States and Canada. The plant employs approximately 100 and charges from the closing are estimated to be $21 million.

The Midland and New Albany plants are part of a company-wide strategic review of General Mills’ manufacturing and distribution network that the company announced it was undertaking this past June. Other manufacturing plants the company plans to close include a ready-to-eat cereal plant in Lodi, Calif., and a yogurt processing facility in Methuen, Mass.