Grasshoppers how many is too many

My son and I were out walking Orchard grass Timothy fields tonight sometimes there were as many as 25 to 30 small green grasshoppers bouncing around our feet. I was talking to a guy a few miles from me and he mentioned he had trouble with them one year. There are some spots where I feel the grass should be looking better then it is. What do you guys think and what kills them if I do have a problem and when do I spray. I do have a pesticide license.

Grasshoppers how many is too many