2,4-D forms and MOA: Which statement is true?

• A. It exists only as a granular
• B. It exists only as a liquid
• C. It is non-selective and contact herbicide
• D. It exists in both liquid and granular forms; selective, systemic herbicide for broadleaf plants

Answer: (D)

2,4-D is a selective, systemic herbicide that acts as a synthetic auxin, meaning it mimics natural growth hormones and moves throughout the plant to disrupt normal development. This causes uncontrolled, overdrawn growth and eventually death in broadleaf plants, while grasses are relatively tolerant, so the product targets broadleaf weeds without harming grasses as much. It comes in multiple formulations, notably both liquid and granular forms, which is why the statement that it exists in both liquid and granular forms is true. The herbicide’s selectivity and systemic action are what let it control broadleaf weeds effectively rather than acting as a non-selective, contact herbicide. That combination—both liquid and granular forms and selective, systemic action on broadleaf plants—best fits how 2,4-D is used.