Herbicides are often used improperly too.

Just remember, from professional to backyard, just follow the label at the bare minimum (I wouldn't trust the APVMA before and after they were gutted but at least somebody is trying). If the situation (plant, place, time of year, and/or pest) is not on the label, back to the drawing board and try again.

And also consider, chemicals are the LAST choice. There are many ways you can treat issues without chemicals. And yes, before you say it, I acknowledge there are some nasty exceptions.