Worms in yard
Thank you for your question. I am sorry that it has taken so long to get you a response. I'm not sure why you want to 'treat' your yard for worms. Earthworms are valuable in the soil, and help to keep it from getting compacted, so it is difficult to grow plants in.
We cannot diagnose lawn problems such as you describe without having photos and, in some cases, being able to examine the grass. I suggest that you contact your county Extension office directly, rather than through Ask an Expert. Here is their webpage: https://elp.tamu.edu/