Thousand cankers disease research increases awareness and solutions for walnut industry
English walnut with bark removed to reveal cankers. (courtesy Elizabeth Fichtner)
What Has ANR Done?ANR established a three-year project to study TCD in California and to inform stakeholders about the latest research. A team from UC Davis, the USDA Forest Service, and UCCE has been working together to address critical gaps in our understanding of this new disease. The team has identified TCD frequently in native and ornamental stands of two species, in black walnut seed trees for rootstock production, and throughout commercial walnut orchards in both English and hybrid rootstocks. From this research the team has developed effective detection tools for both the beetle and the fungus, and these tools have been put into practice at both national and international levels.
New knowledge and solutions for the walnut industryThis research and the associated outreach programs have increased worldwide knowledge about disease biology and etiology for detection, generated interim solutions, raised awareness of TCD, and identified promising avenues for further study to limit the disease’s damage and spread. Growers who are particularly concerned about TCD are removing diseased trees and burning them to mitigate potential sources of the vector and inoculum in their orchards. Team members have actively engaged various stakeholders, including growers, regulatory biologists (CDFA and eastern state agencies), Master Gardeners, and scientists at state and national conferences. UCCE Advisors and the walnut industry in California have assimilated the new knowledge that this project has provided and are applying it in real-world conditions. Project members have received frequent invitations to present their latest information at scientific conferences and at UCCE- and industry-sponsored meetings.
Supporting Unit:Plant Pathology - CAES USDA Forest Service; Entomology - CAES; UCCE
Richard Bostock, Professor, 530-752-0308, firstname.lastname@example.org
Steven Seybold, Research Entomologist, USDA Forest Service,530-759-1734, email@example.com