As a kind of annual late-spring weed, dayflower(Commelina Commw2is L), which existed mainly in dry land, such as soybean, wheat and corn, was very difficult to control.

• 鸭跖草是一年生晚春杂草，主要危害大豆、小麦、玉米、花生等旱田作物，防除难度大。