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Pierce's Disease: This bacterial disease, frequently spread by insects such as glassy-winged sharpshooters and blue-green sharpshooters, kills vines within a few years of infestation; there are no known preventatives (other than quarantine) and no known cures. It is a problem in California; both grapegrowers and government organizations are working to find solutions to stop the disease from spreading to healthy vineyards.

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