注意跟sumitomo， Valent  Biosciencs 的关系 从2009年起， valent 就跟VBC 归口统一领导团队。   Valent U.S.A. Corporation was founded in 1988 through a joint venture between Sumitomo Chemical Company, Limited, a global leader in the discovery of crop protection, plant enhancement and other products for food, health and the environment, and Chevron Chemical Company.  In 1991, Valent became a wholly owned subsidiary of Sumitomo Chemical Company, Limited. In 1994, Valent de Mexico was established. In 2001, Valent began marketing and selling plant growth regulators, bioinsecticides and other biorational products from Valent BioSciences Corporation—the former Ag Specialties Business Unit of Abbott Laboratories. In 2004, Valent becomes the Sumitomo Chemical Company regional headquarters of the Americas. In 2007 the Valent Canada - Crop and Professional Products office opened in Guelph to bring new innovation and technology to Canadian growers.   In 2009, Valent U.S.A. Corporation and Valent BioSciences Corporation aligned under common leadership.