Had the same problem with grasshoppers 2 and 3 years ago in Central Texas.
The asparagus did come back tho. Amazingly the first thing the grasshoppers
attacked was Bay Laurel. Devasted every leaf on some. But they all came
back too-in a year. Now I have Guineas to help keep the grasshopper
population bearable but they haven't been the problem this year as in the
past.