A nymph-stage potato leafhopper (Empoasca fabae, right of center) rests on a leaf of alfalfa (Medicago sativa). The discoloration and scarring seen on the leaves is called hopperburn, and is the result of a toxin contained in leafhopper saliva. Leave a Reply Cancel reply Search Search for... Search Get New Posts in your Inbox! Enter your email address to subscribe to Entomology Today. You'll receive notifications of new posts by email. Email Address Get Certified!