Description
    Several species of grasshoppers have been reported feeding on black walnut. Grasshopper nymphs and adults are green-colored insects with long hind legs designed for jumping. Adults may be as long as 2 inches.

Injury
    Grasshoppers feed on leaves and are not normally considered a serious pest. However, if a walnut plantation is adjacent to an open field that is cut periodically to produce hay or some other crop, the grasshoppers may move over to the walnut trees after the field crop has been cut.

    Defoliation of trees may occur when grasshopper populations are high.

Control
    If possible, do not grow black walnut trees near open fields where high grasshopper populations are common. Otherwise, consult your county extension agent for recommended controls.