Which herbicide should be used with caution around landscape plants due to root uptake and should not be used inside the drip-line of trees?

Which herbicide should be used with caution around landscape plants due to root uptake and should not be used inside the drip-line of trees?

• A. Diacamba
• B. MCPA
• C. MCPP
• D. Q4

Answer: (A)

Root uptake is a major concern when certain herbicides move through the soil and are absorbed by tree or landscape plant roots. The herbicide that fits this caution best is dicamba. It is a systemic, soil-mobile herbicide that can be taken up by roots and translocated to shoots, making landscape plants near treated areas susceptible to injury if applications occur inside the tree drip line. Because most feeder roots extend under the canopy, applying dicamba within that area increases the risk of root uptake and damage to trees and ornamentals, hence the warning to use with caution around landscape plants and to avoid placing it inside the drip line. The other herbicides listed are not as strongly associated with root-uptake injury to trees in this context, so the dimmed risk here centers on dicamba.

Root uptake is a major concern when certain herbicides move through the soil and are absorbed by tree or landscape plant roots. The herbicide that fits this caution best is dicamba. It is a systemic, soil-mobile herbicide that can be taken up by roots and translocated to shoots, making landscape plants near treated areas susceptible to injury if applications occur inside the tree drip line. Because most feeder roots extend under the canopy, applying dicamba within that area increases the risk of root uptake and damage to trees and ornamentals, hence the warning to use with caution around landscape plants and to avoid placing it inside the drip line. The other herbicides listed are not as strongly associated with root-uptake injury to trees in this context, so the dimmed risk here centers on dicamba.