To effectively control perennial weeds, which type of herbicide should be used?

• A. Contact herbicide
• B. Translocated herbicide
• C. Preemergent herbicide
• D. Non-selective herbicide

Answer: (B)

When dealing with perennial weeds, you need a herbicide that can move inside the plant to reach the roots and underground storage organs. Perennials survive and regrow from roots, rhizomes, or tubers, so a translocated (systemic) herbicide absorbed by the foliage or roots travels through the plant’s vascular system to kill those hidden parts. This makes it much more effective than a contact herbicide, which only destroys tissue it touches and often leaves the root system alive to regrow. Preemergent herbicides prevent new weed seeds from germinating, so they don’t control established perennials. Non-selective herbicides kill many plants indiscriminately and aren’t specifically chosen for penetrating and eliminating perennial root systems.