It looks like crab grass from here. This is an annual grass with broad, ugly blades that tends to sprawl out like the arms of a crab and look like hell. Most weed chemicals designed for lawns are specific to killing broadleaf plants (dicotyledons), because most weeds are dicots while grass is a monocotyledon and thus unaffected by this type of poison. The problem with crab grass is it is a monocot, not a dicot (being just another species of grass), so will not be killed by these chemicals. On the other hand, if you use grass-killing chemicals, they will kill not only the crab grass but also the desired lawn grass.
Crab grass has to be controlled with a pre-emergent chemical that kills the seeds. This works by killing only seeds, not adult plants. Since crab grass is an annual, it has to come up from seed fresh each year. You have to put down the crab grass killer prior to the sprouting of the seeds, i.e. in very late winter. Once they have sprouted it's too late.
For this year you could get a spray bottle of grass killer and spot spray the individual crab grass plants, but this is going to be a lot of work judging from the number of them you have in the photos. Or you could put down a broad-spectrum like Roundup that kills everything, then replant the entire lawn with new grass seed. It takes surprisingly little time to get a fully mature lawn this way -- with water, sun, and warm weather, it can take as little as six weeks from the time you plant to the time the new lawn is mature. (If you go for sod it will be much more expensive, and half of it will probably die anyway.)
Utopia in Decay -- The future is coming to get you.
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Cherkauer
Could some body help me indentify the type of weed and hopefully advise me what kind of weed control I should use.
Thanks in advance,
Here are link to the images I took:
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