Prohexadione is widely used in agriculture as a plant growth regulator. It is primarily applied to control excessive vegetative growth in various crops, promoting more compact and sturdy plants. This chemical works by inhibiting gibberellin biosynthesis, which helps in reducing internode elongation and improving the overall plant structure. It is particularly effective in managing the height of cereal crops like wheat and barley, enhancing their resistance to lodging. Additionally, Prohexadione is used in fruit trees, such as apples and pears, to improve fruit quality by optimizing canopy growth and increasing light penetration. Its application also aids in reducing the need for mechanical pruning, thereby lowering labor costs in orchards.