1. Yunnan has a mild climate and a long growing season, so the supply of Yunnan Russula is sufficient, and the natural price is relatively reduced.
2. Yunnan province has taken measures in planting, invested a lot of money and strength to promote the development of agricultural modernization, improved the planting efficiency of Russula, and thus reduced the price of Russula.
I hope the above information can help you solve the problem. Please feel free to let me know if you have any other questions.