Phytoplasmas cause purple top disease, which reduces yield and produces rolling of the leaves and purple discoloration. They can cause direct damage by feeding, or indirect Adult leafhoppers transmit the curly top virus from plant to plant. Beet Leafhoppers. The Citrus Stubborn Disease and the Curly Top Beet Virus are both spread by beet leafhoppers, most particularly the latter. This damage can eventually merge and cause leaves to drop. Rondon and T. Oppedisano S everal species of leafhoppers (Hemiptera: Cicadellidae) feed and thrive on potato. The beet leafhopper acquires the virus from infected crop plants or weeds such as wild mustards and Russian thistle. Leafhoppers have piercing/ sucking mouthparts. Damage caused by the leafhopper feeding is relatively minor, but beet leafhoppers are a serious pest because they vector beet curly top virus when they feed. 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. Leafhoppers belong to the order Homoptera, the same as cicadas. Plants begin to show symptoms about 7 to 14 days after they are first infected by a leafhopper. It’s about a tenth of an inch in length, with translucent wings. Identification. 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. Leafhoppers damage potatoes by feeding on the plants, or by transmitting viruses and phytoplasmas, which are small bacterial parasites of plant phloem tissue. It carries a tomato virus for which there are no controls once plants become infected. Common host plants include beans, corn, lettuce, beets, potato, grapes, roses and many others. 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. Adults are small, pale green or mottled brown, somewhat wedge shaped, and about 0.12 inch (3 mm) long. The beet leafhopper (Circulifer tenellus) is a tiny pale green or tan bug with darker, blotchy markings. Leafhopper adults (1/4 inch long) are slender, wedge-shaped insects that fly or disperse rapidly when disturbed. 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 . Nymphs are whitish to pale green and move rapidly when disturbed. Depending on species they may be green, brown or yellow in color and often have colorful markings. The disease produced in hemp, beet curly top, can cause a wide range of growth disorders and can seriously damage plants. This disease regularly occurs in Control: The best form of control is to apply insecticides. Producers should monitor pest populations and use a combination of controls to manage leafhoppers. ... which can cause white or yellow spots on beet foliage. Only brief feeding periods (minutes) are required for the leafhopper to acquire the virus and transmit it to new plants. However, the main damage caused by the leafhopper is from a pathogen vectored by adults. The beet leafhopper can go through several generations in a year, and may have already laid its eggs on the plants. the beet leafhopper. Most leafhoppers are minor problems on potatoes in California with the exception of the beet leafhopper. Curly top is usually the most destructive disease of beets where it occurs. 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. Damage Management Description of the Pest. The damage produced by beet leafhopper is due to its ability to transmit (vector) a virus to hemp, beet curly top virus.
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