Question
I have Bermudagrass ( front lawn in southern california )that is invested with crabgrass. We used ortho crabgrass killer about a week and a half ago.  The Bermudagrass seem to brown which it said it would but the crabgrass seems to still hanging around.  What do I do and what do I expect?

Answer
If you applied the chemical according to all the label directions then the Company owes you an explanation. Call them and be prepared to tell them exactly what you did in terms of mixing and applying their product. They will tell you how you can get better results next time. They are very interested in customer satisfaction.