Identification. Circulifer tenellus, ‘Beet Leafhopper’, ‘Neoaliturus tenellus’ The beet leafhopper is a particularly troublesome pest, as these leafhoppers are known carriers for two different bacterial plant diseases. The beet leafhopper can go through several generations in a year, and may have already laid its eggs on the plants. This damage can eventually merge and cause leaves to drop. The disease produced in hemp, beet curly top, can cause a wide range of growth disorders and can seriously damage plants. Adults are small, pale green or mottled brown, somewhat wedge shaped, and about 0.12 inch (3 mm) long. Leafhoppers belong to the order Homoptera, the same as cicadas. The Citrus Stubborn Disease and the Curly Top Beet Virus are both spread by beet leafhoppers, most particularly the latter. Rondon and T. Oppedisano S everal species of leafhoppers (Hemiptera: Cicadellidae) feed and thrive on potato. Beet Leafhoppers. This disease regularly occurs in Common host plants include beans, corn, lettuce, beets, potato, grapes, roses and many others. Mechanically remove all annual and perennial weeds , especially the preferred hosts Russian thistle and mustard weeds, in addition to cleaning out any spent vegetable plants in the fall . the beet leafhopper. Problem: Beet Leafhopper Affected Area: Leaf and Crown Description: The severity of the damage to sugar beet from the virus infection depends on the size and proportion of the leafhopper population carrying the virus from its winter breeding sites. Leafhoppers damage potatoes by feeding on the plants, or by transmitting viruses and phytoplasmas, which are small bacterial parasites of plant phloem tissue. Plants begin to show symptoms about 7 to 14 days after they are first infected by a leafhopper. Leafhopper adults (1/4 inch long) are slender, wedge-shaped insects that fly or disperse rapidly when disturbed. Biology and Management of the Beet Leafhopper and Purple Top Phytoplasma Affecting Potatoes in the Pacific Northwest OREGON STATE UNIVERSITY EXTENSION SERVICE EM 9282 April 2020 S.I. It carries a tomato virus for which there are no controls once plants become infected. Only brief feeding periods (minutes) are required for the leafhopper to acquire the virus and transmit it to new plants. Curly top is usually the most destructive disease of beets where it occurs. Depending on species they may be green, brown or yellow in color and often have colorful markings. They can cause direct damage by feeding, or indirect Phytoplasmas cause purple top disease, which reduces yield and produces rolling of the leaves and purple discoloration. The damage produced by beet leafhopper is due to its ability to transmit (vector) a virus to hemp, beet curly top virus. Damage Management Description of the Pest. Most leafhoppers are minor problems on potatoes in California with the exception of the beet leafhopper. Producers should monitor pest populations and use a combination of controls to manage leafhoppers. ... which can cause white or yellow spots on beet foliage. Nymphs are whitish to pale green and move rapidly when disturbed. The beet leafhopper (Circulifer tenellus) is a tiny pale green or tan bug with darker, blotchy markings. Leafhoppers have piercing/ sucking mouthparts. It’s about a tenth of an inch in length, with translucent wings. Adult leafhoppers transmit the curly top virus from plant to plant. One variety of hopper, known as the beet leafhopper, is 1/8 of an inch long, pale green or yellow, and resembles a tiny white fly when flying. However, the main damage caused by the leafhopper is from a pathogen vectored by adults. 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