I have a need to kill some undergrowth brush between a section of large trees that was ‘thinned’ for lack of a better term . All the new sunlight has caused massive weed and brush growth that I want to get rid of in a certain area. If I’m careful with RM43 will it still be a risk to the large trees whose root system no doubt is still in the area of the brush? I’m worried about imazyper runoff after rain, or it sucking into the weed root system which could be intermingled with large diameter tree roots. I intend to just spray on the foliage and not soak soil. Thanks for the help.