Annual Bluegrass is pretty easy to identify compared to the others. It has pretty narrow blades and produces a fair bit of seed at low heights. The leaf tips have a slight boat shape to them like the tip of a canoe.
The cool thing about how some of these plants adapt to mowing is that they will not only change their growth habit to grow low and wide, but they will also produce seed at those lower heights, kinda like dandelions.
I'm generally biased against things like Roundup for homeowner use unless it's a full blown infestation and then in those situations I just remove the top layer and re-sod. I prefer physical labour to remove smaller infestations of weeds like that and then focusing my attention on getting the soil right and making sure I'm overseeding with the right species of grass for the site conditions (light, water, soil fertility, etc.). I guess it just depends on your available time, personal preferences and so on. When I first got into the industry I used Round-up a fair bit for weed control and then as I learned more I realized that I could approach weed control from a different way - but it takes more time, effort and knowledge.
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