Although there is generally one generation a year, eggs hatch over a long period of time and development from egg to adult requires about 40-60 days. Thus, grasshopper problems will likely persist until late fall when old adults begin to die or when a killing frost occurs. Eliminating weeds will starve young hoppers and later discourage adults from laying eggs in the area. Destroying weeds infested with large numbers of grasshoppers can force the hungry grasshoppers to move to nearby crops or landscapes. Control the grasshoppers in the weedy area first with insecticides or be ready to protect nearby crops if they become infested.
Grasshoppers are susceptible to many insecticides.
The length of control will depend on the residual activity of the insecticides and the frequency of retreatment. Controlling grasshoppers over a large area will reduce the numbers present which can re-infest a protected area. Monitor grasshopper infestations and treat threatening infestations while grasshopper are still small and before they move into crops and landscapes. The active ingredient in Bayer Advantage Home and Garden Spray and Tempo Bifenthrin. Active ingredient in Spectracide Product and other brands Acephate.