Question
I am still looking for "how" I can identify and eradicate my lighter colored grass spots.  These are a little broader bladed than the normal lawn.  I live in the Willamette Valley in Oregon where temps are somewhat mild.

Thanks

Answer
My guess (without seeing it) is that it is probably a wild perennial grass such as a tall fescue or even buffalo grass. Most of these can be eradicated using a liquid "weed and grass" killer like Round-Up (Ortho's) and new desirable lawn grasses can then be seeded/sodded.

Weed and grass killers are formulated to kill any green plants (such as flowers, grass, weeds) so spray carefully and avoid applying on a windy day to avoid drift. The grass/weeds should die within 7-14 days.

The product will not translocate in soil and it is safe for you to sod/sow immediately after the product is dry (but I recommend waiting until the vegetation, which was sprayed, has started to die back).

Avoid "grass killers" such as those used for patios, walkways etc as they typically reside in the soil for a long time (to avoid grass from re-occurring). These can be damaging to the soil for months or even years to come. You should choose a product which allow you to re-seed immediately. Ortho's Round-Up is one such product. Any other product listed as "weed and grass killer" should be safe, too, but do check lable carefully to make sure it is not a product for areas where grass growth is unwanted. "Weed and grass killers" are typically used where grass is wanted, but where you want to eradicate weeds and/or grass temporarily.

Sometimes, bringing a sample of the weed to a larger garden center or your local county extension office (check blue phonebook; typically part of a larger university) they can help you identify the grass. Once identified, a plan for eradication can be put together. In lieu of same, you can use above plan which works both on perennial and annual weeds.