These things popped up in my lawn since about two weeks ago. Their appearances really get on my nerves, and it will be tough to wage a war against them. I contacted Scotts Lawn Service to have a free lawn analysis. Hopefully they can suggest something useful but not too costly.
Based on what I have read so far, I guess I made mistakes in not doing some prevention work in early spring and then mowing the lawn too short. I will try to stop mowing my lawn for a while and apply Ortho Grass-B-Gon Garden Grass Killer. I will also consider mowing with bagger to collect the seeds of them.
$%@x#!, I really hate my lawn!