Lessons from the US Forest Service FHP SOD Program in CA · Lessons from the US Forest Service FHP...
Transcript of Lessons from the US Forest Service FHP SOD Program in CA · Lessons from the US Forest Service FHP...
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Lessons from the US Forest Service FHP SOD Program in CA By: Phil Cannon, Susan Frankel and Pete Angwin
Photo by: Tom Coleman
Mescal Ridge
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Why this presentation ?
• Forest Health Protection of State and Private Forestry of the USDA Forest Service has supported 200 + SOD projects in the past 15 years (these are year-long projects from $3,000 to $120,000/year)
• 10,000,000 $OD Dollars have come from the Forest Service via S&PF-FHP;
• Objectives for the S&PF FHP SOD Grant Program have been: 1) to monitor the pathogen; 2) to promote understanding about the disease through extension; and (3) to manage the disease… and to do all these things in sync with COMTF.
• There have been several hundred collaborators in this effort. THANK YOU!!
• Science was used in picking projects and applied science lessons were learned up as projects were executed.
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How we picked projects
• We have four criteria for picking projects; the most important is the likelihood of success, or, will the disease be better managed?
• Existing scientific evidence (both publications and researchers) was consulted regularly to see if a proposed project might be successful.
• We also received progress reports during the development of every project and took time to visit all projects. This allowed us to see what was working and what needed fixing.
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SOD Arrives in California- approximately 1985
Shows up as an epidemic at Scott’s Valley, Saratoga, Mill Valley and China Camp from 1990-1995
In 2000 the causal agent is determined to be Phytophthora ramorum.
Aspects of the etiology of the disease are worked on from 2000-2008 (and ongoing). because “you have to know the biology of a disease (both the pathogen and the host) before you have a chance of managing it” abbreviated quote from Garbelotto et al 2003.
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How Phytopthora ramorum operates • There are many hosts; bay is a typhoid Mary kind of a host;
• The understanding of spore dispersal has evolved substantially;
today estimates of dispersal
distances are greater than
initial estimates.
• One pathogen; two diseases;
• Foliar hosts (120 species)
• Bole canker (5 tree species)
Photo by Jennifer Parke
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Tan oak efficiently
fills in voids
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Point Reyes gets 1411 hours of fog each year (17% of all time in a year)
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• Ground Surveys: people on foot look for symptomatic vegetation and take samples
• Aerial Detection: people detect
mortality consistent with disease from an aircraft
• Stream Monitoring: detects when
pathogen is input—often from terrestrial infection—upstream of leaf baits
SOD Detection
1 2
3
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Monitoring aspects on the ground • Look for bleeding cankers
• Look for infected leaves of bay
• Stream baiting
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Aerial Detection of SOD
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CLO often growing in drier parts of California than tanoak
Bonello group found some CLO have ample genetic resistance to SOD
Phytosphere showed that elimination of neighboring bays can help prevent infections that would lead to bole cankers (GTR Publication)
THE COAST LIVE OAK - SOD SITUATION
SOD Blitzes & Town Halls work: We don’t worry much about Coast Live Oak
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Several management possibilities have been explored towards dealing with SOD in tanoak
• Showing private land owners what they can do to avoid SOD • Mapping to show areas of high, moderate and low risk • Development of SOD Free Zones or Barriers • Bay tree removal • Phosphite (Agri-Fos) • Increasing Spacing between trees • Genetic resistance to the pathogen • In situ gene conservation/ protection of sacred groves • The management options for SOD on and near Tribal Lands are receiving
lots of attention because of the importance of tanoak in Tribal cultures.
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A SOD BLITZ IN ACTION…. WUI FOREST PATHOLOGY
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Evolution of concepts on what could constitute a successful barrier to spore travel • A host free zone needs to be this distance away from an infected tree
in order to keep a susceptible tree from getting its foliage or bole infected with P. ramorum
• 10 m
• One chain (approx. 20m)
• 100 m
• ¼ mile
• 3 miles
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The VAN DUZEN NO-HOST ZONE (¼ mile wide, 2 miles long)
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Photo: Pete Angwin
Dominic Bongio Demonstrates Hack n’ Squirt Application $90.00/acre
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REDWOOD CREEK SITUATION
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Same Tree
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The nursery connection; Thanks CDFA!!
• Thanks to CDFA !!!! West coast nurseries found to be infected
with P. ramorum via nursery
inspection/survey
0
20
40
60
80
100
120
2004 2005 2006 2007
WA
OR
CA
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CONCLUSIONS: Much has been learned about managing SOD; In California landscapes we have been playing catch-up too much of the time; However, just a fraction of the potentially at- risk hosts have been killed to date; Better prediction tools are now available; A greater understanding of the tan oak’s value to native Americans has led to greater emphasis on tribal projects; By choosing our battles and starting quickly we have better chances of managing SOD and being cost-effective;