Application: a systemic herbicide used for control of woody plants and a wide range of broad-leaved weeds, most gramineous grasses are resistant to picloram.

• 用途：毒莠定及其盐可迅速地通过叶和跟部吸收与传导，除十字花科作物外大多数阔叶作物都对该药敏感，大多数禾本科作物是耐药的。