Are you talking about Ferti-lome Over the Top Grass killer??
If you have a acrobat reader for pdf. files then here is the product label.
On this label you will find a chart listing of different trees/shrubs and herbaceous plants and a rating from 1-4 for injury...1 being no signs of injury.

Vera

Here is a link that might be useful: Ferti-lome Over The Top-Grass Killer