Outreach and Extension

Led by Janine Hasey, the outreach for the collaborative research group involves several University of California Cooperative Extention farm advisors across the main walnut growing counties of California. Their advice is based on the latest research and on-farm assessments act as a conduit between growers and the research community, a necessary component of identifying and addressing emerging threats to the industry. Recently they have conducted statewide surveys of Paradox rootstock and English scion for Thousand Canker Disease incidence and Paradox rootstock for crown gall incidence and severity.

Your farm advisor Thousand Canker Disease survey team:

A guide to terms walnut rootstock research terms used: 2014 Walnut Rootstock_Nomenclature Final.pdf

 

Presentations

Bostock, R.M. Update on Thousand Cankers Disease in California. CA Dept. of Food and Agriculture, Presentation to scientists/staff at Plant Pest Diagnostics Lab, MeadowView, CA, 10-2012.

Bostock, R.M. Thousand Cankers Disease of Walnut. Presentation to Master Gardeners at our NPDN-sponsored Collaborative and Enhanced Pest Detection Workshop, UC Davis Arboretum, 8-2- 2013.

Bostock, R.M.  Thousand Cankers Disease. One-hour lecture and 1.5-hour field trip presented to approx. 25 students in Plant Science 170A (Fruit and Nut Cropping Systems), UC Davis, October 25, 2013.

Bostock, R.M. Thousand Cankers Disease of Walnut. California Center for Urban Horticulture-National Plant Diagnostic Network joint sponsored workshop on Current Issue in Invasive and Emerging Pests and Diseases.  presentation to approx. 100 plant health professionals, regulatory biologists, nursery professionals and other stakeholders. UC Davis, February 5, 2014

Bostock, R.M. Thousand Cankers Disease of Walnut. Twenty-minute presentation within a symposium entitled “Managing Pathogens Vectored by Insects” at UCCE Farm Advisor Workshop at UC Davis, February 25, 2014, to approx. 80 Farm Advisors and UCD faculty, students and staff.

Hasey, Seybold and Bostock. Provided a workshop/training to Univ. California farm advisors on field ID of Thousand Cankers Disease. Tuesday, August 20, 2013. 10 Farm Advisors in attendance.

Seybold, S.J. Walnut twig beetle and thousand cankers disease. presentation to 50 growers and UC cooperative extension personnel at the 2013 Lake County Walnut Update sponsored by UC Cooperative Extension, March 8, 2013, Lakeport, CA.

Seybold, S.J. Walnut twig beetle detection techniques. presentation to takeholders with the Ohio Department of Agriculture, Ohio State Univ., and USDA APHIS at the Columbus campus of the Ohio State Univ., January 29, 2013, Columbus, Ohio.

Seybold, S.J.  Walnut twig beetle:  Status of the national detection program and update on research in California.  Invited presentation at the 62nd Annual Meeting of the California Forest Pest Council, Sacramento, California, November 20, 2013.

Seybold, S.J.  Thousand cankers disease and walnut twig beetle.  Twenty-five minute presentation to 125 tree care professionals at the meeting of the Western Chapter of the International Society of Arboriculture, March 6, 2014, Santa Rosa, California.

Seybold, S.J.  Walnut twig beetle and thousand cankers disease.  Thirty-minute presentation to approx. 50 growers, industry representatives, academic scientists, and UC cooperative extension personnel at the 2014 San Benito County Walnut Institute sponsored by UC Cooperative Extension, the San Benito County Agricultural Commissioner, and the California Walnut Board, March 13, 2014, Hollister, California.

Browne, “Phytophthora and Lethal Paradox Canker: Long-Standing and Emerging Soilborne Diseases of Walnuts”; Fresno, CA; November 14, 2013; event was 2013 Grape, Raisin, and Nut Expo, Fresno.

Browne, “Phytophthora and Lethal Paradox Canker: Long-Standing and Emerging Soilborne Diseases of Walnuts”; Turlock, CA; November 12, 2013; event was 2013 Tree & Vine Expo,

Browne,  “Update on Crown and Root Diseases of Walnut”; Red Bluff, CA; February 1, 2013, event was Walnut grower meeting, UC Cooperative Extension.

Kluepfel, D, and Greg Browne; “SCRI Project: Development of Disease-Resistant Walnut Rootstocks: Integration of Conventional and Genomic Approaches”; Sacramento, CA; August 22, 2013; event was Walnut PRAC industry meeting for genetic improvement.

Kluepfel, Browne, McKenry, Seybold, and Bostock, 2014. Progress made towards development of disease resistant walnut rootstocks. Walnut Research Conf., Jan. 2014. Bodega Bay, CA .

Leslie, C.A.. 2013. The California Walnut Improvement Program: Scion Breeding and Rootstock Development. Presented at: 7th International Walnut Symposium, July 21, 2013, Fengyang, China.

Poster – APS meeting, Aug 2013, Austin, TX:  Thousand Cankers Disease in California English Walnut: Incidence, distribution, and characterization of Geosmithia morbida.  Mohammad A. Yaghmour, Tivonne L. Nguyen, Tatiana V. Roubtsova, Janine Hasey, Carolyn DeBuse, Elizabeth J. Fichtner , Richard Hoenisch, Steven Seybold, and Richard M. Bostock

Poster – ANR Statewide conference, Apr 2013:  Thousand cankers disease and the walnut twig beetle: A rapidly emerging invasive threat to walnut in California.  Mohammad A. Yaghmour, Stacy Hishinuma, Tivonne Nguyen, Tatiana V. Roubtsova, Janine Hasey, Elizabeth Fichtner, Mary Louise Flint, Steven Seybold, and Richard M. Bostock

Poster – UC Davis Plant Pathology, 19 Sep 2013:  Comparative studies of Geosmithia morbida, the causal agent of thousand cankers disease, on the English walnut, Juglans regia, and other members of the Juglandaceae in California.  Tivonne Nguyen, Mohammad A.Yaghmour, Tatiana V. Roubstova, Steven J. Seybold, and Richard M. Bostock