Scientists at UC Berkeley held a public workshop last week to announce the results of the 2013 SOD Blitz. A video of the workshop is available here. The annual SOD Blitz engages citizen volunteers in identifying bay laurel trees infected with the pathogen that causes Sudden Oak Death. Bays are tested because the infection is more easily identified in bays than oaks. Scientists who study SOD believe that although the pathogen doesn’t kill bays, they are considered the primary vector of the disease to oaks that are killed by the pathogen.
About 500 volunteers participated in the 2013 SOD Blitz which took place last spring. The pathogen is most easily identified in the spring when it is still wet and cool. Over 13,000 samples were taken from about 2,000 trees. The samples were tested in laboratories for the pathogen. Thirty-one percent of the samples were symptomatic for the disease.
The infection rate was lower in 2013 than some previous years because it was a dry year. The infection rate was highest in 2011, which was a particularly wet year. Infection rate correlates positively with rainfall and lower temperatures. Therefore, infection rates are higher in coastal locations and lower in inland locations. Infection rates increased significantly in 2013 in Santa Cruz and South Skyline Blvd in San Mateo County.
Mortality rates vary by oak species. Tan oaks are most vulnerable to the disease, which is expected to kill 100% of infected tan oaks. Coast live oaks are slightly less vulnerable to the disease. About 90% of infected coast live oaks are expected to die.
The results of five years of SOD Blitzes have been mapped and can be viewed here.
SOD Workshops are scheduled all over California in October and November to advise the public about preventative treatments for oaks:
10/12 Sat 10am Burlingame Hills – 120 Tiptoe Lane (off Canyon Rd.), Burlingame, CA Steve Epstein – firstname.lastname@example.org
10/23 Wed 1pm UC Berkeley – UC Berkeley Campus, SOD Treatment Training Workshop Webpage Link
11/1 Fri 7:30pm Atherton – Los Altos Library, S. San Antonio Rd, Los Altos, CA Arvind Kumar – email@example.com
11/2 Sat 10am Sonoma – Location TBA, Lisa Bell – firstname.lastname@example.org
11/9 Sat 10am Los Altos Hills – Foothills Park 3300 Page Mill Road, Los Altos Hills, CA Sue Welch – email@example.com
11/12 Tue 8:30am San Francisco Presidio – Location TBA
11/12 Tue 6:30pm Mendocino – Fort Bragg Town Hall, Fort Bragg, CA Lori Hubbart – firstname.lastname@example.org
11/13 Wed Santa Lucia Preserve – Time and Location TBA
11/14 Thur 6 pm Potluck, 7 pm talk by Matteo Garbelotto from UCB on “Biology of the SOD pathogen and disease control strategies”, UCSC Arboretum, 1156 High St, Santa Cruz, CA Map Link Brett Hall – email@example.com
11/16 Sat 10am Marin – Dominican University, 155 Palm Ave., Joseph R. Fink Science Center, Room 102, San Rafael, CA Kristin Jacob – firstname.lastname@example.org
11/16 Sat 1pm Napa – Pelusi Building, 2296 Streblow Drive at Kennedy Park, Napa, CA Bill Pramuk – email@example.com
11/17 Sun 10am South Skyline – Saratoga Summit Forestry and Fire Protection (CalFire) CDF fire station, Jane Manning – firstname.lastname@example.org
11/23 Sat 10am Montalvo – Montalvo Arts Center, 15400 Montalvo Road, Saratoga, CA Kelly Sicat – KSicat@montalvoarts.org
11/24 Sun 1pm Oakland – Joaquin Miller Park, Oakland, CA Kimra McAfee – email@example.com