The current emphasis on high-quality forage production has made many growers and agricultural consultants aware of the economic importance of controlling the potato leafhopper (Empoasca fabae Harris) on alfalfa. Although rarely present in numbers large enough to damage the first cutting, the potato leafhopper is the most damaging insect pest of alfalfa during the second and third cuttings in most of the Northeast To protect plant quality and yield, the control of this insect on alfalfa during the second and third cuttings has become a focus of Integrated Pest Management programs.