U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Crops Pathology and Genetics Research: Davis, CA
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    Outreach Events
                        UC Davis Picnic Day
                                    Kinders go to College
                                    STEM Girls
                                    Future Scientist Program
                                    Agriculture Future of America
                                    Wallace-Carver Fellowship
                                    Young Scholars Program
                                    Annual Awards Banquet
                    About Us
                        About Us
                                    Our Mission
                                    Principal InvestigatorsSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Pacific West Area Davis, California Crops Pathology and Genetics Research Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications
- Etiology and Biology of Tree Crop Diseases
- Rice Genetics
- Sustainable Floriculture
- Sustainable Viticulture

Title:   Author  item
                                            Baumgartner, Kendraitem
                                            WARREN, JEREMY - USDA, ARS, CPGRU
  Submitted to: Plant Disease
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 6/7/2005
                                    Publication  Date: 10/1/2005
                                    Citation: Baumgartner, K., Warren, J.G. 2005. Persistance of xylella fastidiosa in riparian hosts near northern california vineyards.. Plant Disease. 10: 1097-1102.Interpretive Summary: The spread of Pierce’s disease (PD) from riparian hosts to grapevines on California’s North Coast is likely affected by populations of the pathogen, Xylella fastidiosa, in riparian hosts, given that the proportion of insect vectors, Graphocephala atropunctata (blue-green sharpshooters, BGSSs), that acquire the pathogen when feeding is known to be related to pathogen populations in plant tissue. Riparian hosts that do not maintain sufficient pathogen populations for BGSS acquisition may not be significant inoculum reservoirs. We examined pathogen populations in systemic riparian hosts (California blackberry, California grapevine, elderberry, Himalayan blackberry, periwinkle) at two coastal locations (Mendocino, Napa), with two quantitation methods (culturing, real-time PCR), from 2003 to 2004. In summer and autumn, periwinkle had significantly higher pathogen populations than Himalayan blackberry and California grapevine at both locations. Nonetheless, all three species had pathogen populations above the threshold for BGSS acquisition in summer and autumn, at both locations. Our results suggest that the presence of periwinkle, Himalayan blackberry, and California grapevine in riparian areas adjacent to vineyards may increase the risk of Pierce’s disease.
                                Technical Abstract: The spread of Pierce’s disease (PD) from riparian hosts to grapevines on California’s North Coast is likely affected by Xylella fastidiosa (Xf) populations in riparian hosts, as the proportion of Graphocephala atropunctata (blue-green sharpshooters, BGSSs) that acquire Xf is a function of Xf populations in plant tissue.  Riparian hosts that do not maintain sufficient Xf populations for acquisition may not be significant inoculum reservoirs.  We examined Xf populations in systemic riparian hosts (California blackberry, California grapevine, elderberry, Himalayan blackberry, periwinkle) at two coastal locations (Mendocino, Napa), with two quantitation methods (culturing, real-time PCR), from 2003 to 2004.  In summer and autumn, periwinkle had significantly higher Xf populations than Himalayan blackberry and California grapevine at both locations.  Nonetheless, all three species had Xf populations above the threshold for BGSS acquisition in summer and autumn, at both locations.  The only Xf-positive plants detected in spring at both locations were periwinkle and Himalayan blackberry, suggesting that these invasive weeds may contribute to long-term survival of Xf in areas with low overwinter survival of BGSS.  Higher Xf populations in California grapevine, Himalayan blackberry, and periwinkle in Napa, relative to plants in Mendocino, may partially explain the higher PD incidence in Napa vineyards.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov