during the summer, areas of lawn dies out

Question

Some areas of my lawn die out during hot weather; however, as the weather gets cooler, it grows back. I applied fungicide and insecticide but it does not seem to help. There are a variety of grass seeds that have been applied over the years (sun and partial shade types). Any suggestion to resolve would be appreciated

Answer 1

Certain cool season grass varieties go dormant during hot weather. Here is how to manage:
https://www.extension.iastate.edu/news/2007/jul/070201.htm
https://extension.psu.edu/diagnosing-turfgrass-problems