I pulled over on our country road to ask the person coming out of an Edison truck with a decal on his door titled Edison Pacific Weed Control. He said he was spraying around all the power poles. I wrote the local Southern California Edison to find out what was being used, strength and spray cycle.
This is what they use:
Bayer Esplanade 200 SC
Dow Agrosciences Milestone
The wind developers appear to kill the environment rather that create clean energy.