Planter around my maple killing it?

[mrkartoom]

you say you used ground ivy killer? can you look to see if its active ingredient is dicamba? this can be VERY harmful if applied under or near trees as it is readily absorbed into the soil. the other products should be okay.

Yes ivy-killer. I think it was a Bayer concentrate product spot-applied with a sprayer. But like I said I never used it within 30ft. of this tree, but did use it all around the other two similar sized maples with no apparent ill-effects (at least to me anyway). Since this tree has thinned out the ground ivy has become less of a problem and it's been a couple seasons since I used the killer.

I looked on Bayer's webpage and they do not show the particular product I have, but it's a few years old and probably discontinued. The only similar product they seem to offer does have dicamba 0.84%. I'll have to check my bottle when I get home. thanks