Weed killer and trees

We live in NC and the weeds are horrible. My husband has taken to spraying weed killer(Ortho lawn weed killer that also kills crabgrass), but he just doesn't spray it on the lawn. We have a stand of trees, that include oak, pine, sweetgum, and a couple others, in a natural type area in our yard that was there when we bought it. He has begun spraying this inside this area too. Is this going to kill our trees?
Submitted by BHGPhotoContest

Ortho makes a number of different weed control products. If one of the active ingredients is dicamba, it should not be used in the root zone of trees and shrubs. Dicamba moves through the soil and can be taken up by the trees. It would take repeated applications to actually kill the trees, but it can cause stunting and  damage to them.

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