The development of grasshopper nymphs to the adult stage requires 40 to 60 days or more. Adult forms of the differential grasshopper usually appear in mid-July. The adult grasshopper is the most voracious feeder, and is able to disperse over large areas due to its strong wings. The adult grasshopper is the most likely stage to invade and damage ornamental landscapes. Because residents of urban communities generally have little control over the surrounding countryside, management options for grasshoppers in urban landscapes are limited.
Homeowners can protect valuable plants, to some extent, through the use of residual insecticides.
Geotextile fabrics can be used as barriers to protect valuable vegetables and specimen ornamental plants. Also, landscape plants that are less attractive to grasshoppers can be used. Insecticides containing chlorpyrifos, diazinon and carbaryl will provide control of shorter duration. Geotextile fabrics have found increased use among vegetable gardeners as floating row covers to protect plants. These fabrics are light enough to permit needed sunlight and air circulation to occur within plants that are covered, yet strong enough to provide a barrier to many insects.