Looks like water stress. Have you been deep watering? Water must peculate down three feet. OR, have they been sitting water? This could cause the same symptoms.

petzold6596....
we live in central Illinois......it sure isn't a lack of water around here! LOL....got plenty of that. So that is a good guess......thanks.....

This looks very much like a response to herbicide, especially 2-4D. Have you or your neighbors had lawn weeds sprayed lately?

hortster:

Oh my gosh, yes!!! we did spray about a week or two ago for weeds! :-( What is going to happen now! Will all the leaves drop off??