That Permethrin 10 will kill any insect.I hope so. The differential grasshopper destroys alfalfa crops. Last year in black canyon city, a blister beetle, which also destroys alfalfa crops, ate all the leaves on my palo verde trees--twice. So I hope that if this is the differential grasshopper, that it doesn't eat any palo verde trees up here. I do have carbaryl and some other pesticides, including permethrin 10.