Beet leafhopper (Circulifer tenellus)
Other leafhoppers (Empoasca spp., Ceratagallia spp.)
Pest description and crop damage The most important leafhopper (Order Hemiptera: Family Cicadellidae) for hemp producers in the PNW is the beet leafhopper, due to its ability to transmit phytoplasmas and viruses like beet curly top. This leafhopper varies in color but is always one of the smaller species and lacks prominent spots or other dorsal or head markings. See Potato, Irish chapter for more details.
In addition, a wide diversity of leafhoppers can be found in hemp fields. These leafhoppers are small, pale green, and torpedo-shaped. They hold their wings roof-like over the body at rest. Empoasca leafhoppers are rarely found in significant numbers in the PNW east of the Cascades. Other leafhoppers usually present is large numbers is Ceratagallia. Its ecological role is unknown.
Scouting and thresholds For detailed information on monitoring beet leafhoppers using yellow sticky traps, see: http://nwpotatoresearch.com/pdfs/PotatoProgressVIII(2).pdf. Although protocol was designed to be used on potatoes, it could apply for hemp.
Beet leafhoppers and leafhoppers in general are preyed upon by a specific parasitoid in the fly family Pipunculidae.
Controlling the favorite weed hosts of beet leafhopper is probably the most important cultural management option although sometimes unpractical.