What causes the grass to die and look like straw?
Certified GKH Gardening Expert
This could be due to a number of things depending on the type of grass. For instance, it could simply be going dormant. It could also have a fungus of some sort, and there are many. Here are some of the most common: https://www.gardeningknowhow.com/lawn-care/lgen/grass-fungus.htm