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The Glassy-winged Sharpshooter (GWSS) is a large leafhopper insect that can vector the deadly Pierce’s disease in grapevines. The glassy-winged sharpshooter produces one to two generations per year. In 1989, a pest new to California, the glassy-winged sharpshooter (GWSS), was collected in Irvine. Glassy-winged Sharpshooter. The Glassy-winged sharpshooter (Homalodisca coagulata) is a serious new pest in California. Photo: Rodrigo Krugner. Subtropical groves such … This pest is a serious risk to California vineyards, because of its faster movements into vineyards. The Ag Commissioner staff inspects all incoming nursery stock for signs of the pest. Although collaborative efforts within the grape industry have kept disease levels down in recent years, population levels of the Glassy-Winged Sharpshooter have been elevating in the San Joaquin Valley. First identified in the State in 1990, this insect has spread throughout Southern California and into the San Joaquin Valley. The map of California (courtesy of the California Department of Agriculture) shows the current distribution of the glassy-winged sharpshooter in southern California and the counties at risk of infection. 12-46F), which turned out to be an efficient grapevine to grapevine vector of the disease. Once in their two-month life span, female glassy-winged sharpshooters lay or oviposit eggs side-by-side in a slightly curved 'blister-like' raft below the epidermis of plant leaves, usually in masses of 10 -12 eggs, but 20 - … The second major piece of sharpshooter management involves quarantine re-quirements for nursery stock shipping from GWSS-infested areas. Adult glassy-winged sharpshooter, Homalodisca vitripennis. When feeding, it can transmit Pierce's Disease to grapevines, and other diseases to almond trees, alfalfa, and oleanders. 2. All winegrape producer entities that paid the assessment on grapes crushed in 2019 received ballots and 49 percent cast ballots. Watch this brief … The Pierce’s Disease & Glassy-Winged Sharpshooter (PD/GWSS) Referendum, conducted this spring, passed with 78 percent approval of California winegrape growers. HISTORY AND STATUS OF THE GLASSY-WINGED SHARPSHOOTER IN CALIFORNIA continued from page 2 approximately 0.5%. Since then, it has been identified throughout Southern California and has spread into the southern San Joaquin Valley, including Kern County, parts of Fresno and southern Tulare counties, and to the coastal counties of Ventura, Santa Barbara and San Luis Obispo. Assessment funds are used for research, outreach, and related activities on PD, GWSS, … The glassy-winged sharpshooter (Homalodisca coagulata) has been a serious pest in California for over a decade. When it comes to Pierce’s Disease and Glassy-Winged Sharpshooter, it’s critical for growers to pay attention to both the disease and the vector. GWSS moves as egg masses on nursery stock from Southern California where the pest is widely established. The Glassy-winged Sharpshooter is a somewhat new Pierce's disease vector (carrier) and recently became established in California. Homalodisca vitripennis , though widely distributed in the southern part of the state, has not yet become prevalent in Northern California or much of the Central Valley. Native to the southeastern United States, this insect was first observed in California in 1989 and is now found throughout Southern California and Kern County. The glassy-winged sharpshooter is a serious agricultural pest in California. The insect is native to the southeast United States and began infesting southern California counties in 1990. Photo: Rodrigo Krugner. Fig. Figure 2. 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