The commission may engage in market development and market research through plans and programs to enhance the sale of California winegrapes and winegrape products for the purpose of maintaining existing markets and creating new and larger domestic and foreign markets, and to educate and instruct the public with respect to the uses and value of California winegrapes and winegrape products. However, any plans and programs so developed and conducted shall not be directed towards a particular private brand or trade name, although private brands and trade names may be used in wine tastings and other similar programs authorized by the commission. In addition, the plans and programs shall make no use of false or unwarranted claims on behalf of California winegrapes or winegrape products, nor disparage the quality, value, sale, or use of any commodity. The commission shall not engage in collective bargaining issues, supply control, grades and quality standards, or price setting activities.