Interaction. Starch prices are similar to corn prices, with strong seasonal and cyclical characteristics, significantly affected by seasonal and holiday effects. Corn starch throughout the year can basically be divided into three important nodes, respectively, May Day, Dragon Boat Festival, August 15 Mid-Autumn Festival, January 1 New Year's Day, October 1 National Day. General corn starch futures prices before this node will have a certain degree of increase, after the festival will fall in stages.