Spot grasshoppers by noticing a lot of holes in the leaves of just about anything. They have voracious appetites.
How to control grasshoppers:
1. Invite Beneficial Insects and other garden creatures. Plant marigolds, calendula, sunflowers, alyssum, asters, and dill to attract beneficial insects like robber flies, and even toads, who love eating grasshoppers.
2. Create a bird-friendly yard
Leave it to the birds to consume large quantities of grasshoppers. You'll want to make them welcome so they'll stick around and feast for longer. Don't attract birds by feeding them - you want them to come for the grasshoppers. Provide water and trees or bird boxes to encourage nesting.
3. Natural Grasshopper Control
There are a number of products on the market for those inquiring about insecticides. Note - insecticides kill grasshoppers but don't prevent them from coming into your landscape and gardens.