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Title The cost of the glassy-winged sharpshooter to California grape, citrus and nursery producers
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In the late 1990s, widespread outbreaks of Pierce's disease in grapevines were linked to transmission via the glassy-winged sharpshooter (GWSS), threatening California's multibillion-dollar table, raisin and wine grape industries. Government agencies responded to the crisis by implementing two control programs to manage GWSS. We analyzed the long-term economic impact of these two programs on citrus, grape and nursery producers. The net economic effects on all citrus producers and on grape producers in the southern San Joaquin Valley were insignificant, while all grape producers in the Temecula Valley saw an average increase in annual production costs of about $13.04 an acre. Based on our survey of nurseries in Southern California, approximately 11% had an infestation in 2008 and 2009, but only 3.0% in 2010. Average losses to nurseries per GWSS infestation were about $12,238. Nursery producers also undertook a variety of pest control methods to prevent infestations and plant losses, and to meet quarantine regulations. Average annual per-acre costs of these approaches were $2,975 for barrier methods to prevent GWSS from entering a premises, $1,032 in pesticide controls and $1,588 for in-house monitoring.

Jetter, Karen M.
Associate Project Economist
Morse Dr, Joseph G
Entomologist and Professor of Entomology, Emeritus
Citrus and avocado pest management, biological control; applied insect ecology; pesticide impacts on natural enemies; resistance management
Kabashima, John N.
Environmental Horticulture Advisor, Emeritus
Ornamental horticulture, nursery crops, pest management, exotic and invasive pests, water runoff, water quality
Publication Date Oct 1, 2014
Date Added Feb 2, 2015
Copyright © The Regents of the University of California
Copyright Year 2014

The spread of GWSS in the late 1990s led to increased costs and changes in agricultural practices for grape, citrus and nursery producers.

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