2,4-D is very effective against which type of weeds?

• A. Broadleaf weeds
• B. Grass weeds
• C. Sedges
• D. Moss

Answer: (A)

2,4-D works by behaving like a synthetic plant hormone (auxin) that disrupts growth patterns in dicotyledonous plants. This causes abnormal development and ultimately death in broadleaf weeds, which is why it’s commonly used to remove broadleaf weeds from turf without harming grasses. Grasses and sedges are monocots and respond differently to this hormone mimic, so they’re not as effectively controlled by 2,4-D. Moss isn’t a vascular plant and isn’t affected by this mode of action either, so it won’t be reliably eliminated. So the weed type most effectively controlled by 2,4-D is broadleaf weeds.