All developmental stages are influenced by temperature, and their growth can be advanced or retarded by favorable or unfavorable temperature. Management Grasshopper management can be effective and practical if the area you are protecting is relatively small and isolated. However, protecting a garden from grasshoppers moving out of a large area of adjacent grassland or cropland may be impossible. Row covers and screens can help protect the more valuable plants, but grasshoppers can eat through all but the heaviest fabric or window screen. If timely rain or irrigation keeps the vegetation in the border areas green, grasshoppers will not migrate into the garden as readily.
Tall grass provides food and shelter for the grasshoppers.
Leaving these border areas unmowed will delay grasshopper movement into the yard and garden. Trap crops will attract and hold grasshoppers and can be sprayed to reduce populations. A common parasite of grasshoppers is the horse-hair or gordian worm. These nematodes can be up to several inches long and will be present inside grasshoppers and crickets. A small red parasitic mite can lodge itself under the grasshopper wings.