Reposted from UC ANR News

Make sure to include pets and livestock in evacuation plans. Ryan Tompkins fills a go bag with dog food for his canine colleague.

 

As the Beckwourth Complex Fire and Dixie Fire spread in Plumas and Lassen counties, Ryan Tompkins reminded residents of ways they could help limit damage.

“If you're under evacuation orders, abide by the evacuation notice, because lingering too long can complicate tactics of emergency responders,” said the University of California Cooperative Extension forestry and natural resources advisor, who recommends packing up important documents and valuables with an overnight bag in advance for a quick exit to safety.

Plan for pets and livestock and water access for a quick response to falling embers that ignite fires. The Plumas County resident said he packed a “go bag” for his dog filled with dog food and other necessities. Every year, Tompkins clears defensible space around his house, including defensible space around his chicken coop in case a fire starts while he isn't home. During wildfire season, he keeps a shovel and a backpack sprayer filled with water staged near his woodshed for easy retrieval if a fire were to start in his yard. If Tompkins needs to evacuate, he switches his circuit box to his generator so any firefighters performing structure triage can access his well water when the power grid shuts down. 

Tompkins maintains defensible space around his chicken coop as well as his house in case a fire starts while he isn’t home.

 

To document possessions for insurance purposes if the house burns, Tompkins recommends shooting video. “Just walk through the house with your phone shooting video and narrating to document the household assets.”

Residents outside of the wildfire evacuation area can take more steps to improve the odds their homes will survive a wildfire.

Even with fire imminent, there are several actions you can do to help prepare your home to withstand fire exposure. UC Cooperative Extension guidance can help residents prepare their home in the days or hours before wildfire exposure.

To protect home from wildfire embers, move combustible items from under attached decks and farther than 5 feet of the structure, recommends Yana Valachovic.

 

If you believe you have at least a couple of hours before fire exposure, review the area around your home and outbuildings for flammable items that could lead fire to the structures, said Yana Valachovic, UC Cooperative Extension forestry advisor in Humboldt and Del Norte counties.

She recommends the following:

• Move combustible items inside or away from the buildings, especially within the first 5 feet of any structure or attached deck
• Clean gutters and other places where pine needles and leaves accumulate on or near the house
• Move BBQ propane tanks away from structures
• Bring in cushions from outside furniture
• Move doormats away from the house
• Seal vents (attic, foundation, drier, etc.) with plywood or heavy foil to prevent embers from entering
• Close all windows and pet doors

“The goal is to remove combustible items away from structures so that embers don't ignite these materials and result in flames touching the house,” Valachovic said. “Temporarily sealing up vents can help prevent embers, or small bits of burning vegetation, from being blown inside the home.”

Dry pine needles and leaves can be ignited by falling embers. Valachovic recommends clearing vegetation that is within 5 feet of the house.

 

If first responders get to your home, Valachovic says you can help them by leaving a ladder against the house, placing buckets or garbage cans of water around the home, and leaving connected garden hoses in easy-to-locate places. Also, leave out a shovel or other tool that could be used to put out small spot fires.

“After you have packed your essentials and your go bag, dress for the evacuation by wearing cotton or wool clothing, a hat, boots, bandanna or mask to protect your nose and mouth, and pack leather gloves,” she said. “These items will help you be prepared if you have to get out of your vehicle or move fallen trees during your escape to safety. Additionally, it may be helpful to pack a shovel, digging bar, chainsaw, or other tools just in case your evacuation route gets blocked.” 

As you evacuate, Valachovic suggests leaving gates open or unlocked so first responders can access your property.

If time allows, turn on the lights in your house to increase visibility and leave a note on the door indicating where you went and who is with you. These instructions can help you reunite with your loved ones.

Thinking through these steps and implementing them if fire is near can help your home and your family survive wildfire. For more evacuation guidance, visit https://ucanr.edu/sites/fire/Safety/Evacuation.

The UC ANR fire activity map shows locations for wildfires and is updated every 12 hours.

 

If you have more time to prepare for wildfires, UC Cooperative Extension provides more information at https://ucanr.edu/sites/fire/Prepare, including a fire map and tips for home hardening and defensible space strategies.

How to Harden Homes against Wildfire, a free 20-page publication by University of Nevada, Reno Extension, UC Cooperative Extension, Tahoe Resource Conservation District and CAL FIRE is also available online at http://ucanr.edu/HomeRetrofitGuide. It includes recommendations for 12 vulnerable components of homes in wildfire-prone areas, including roofs, gutters, vents, siding, windows, decks and fences.

Reposted from the UCANR News

California oak woodlands are highly prized ecoregions where stately trees, many of them hundreds of years old, are cornerstones of a habitat for wildlife and native plants. Sadly, some of these ecosystems are seriously threatened by exotic pests and diseases, encroachment by less desirable vegetation, and wildfire.

Each year, UC Cooperative Extension hosts workshops to share scientific developments aimed at conserving these important habitats – and the economic value of ranching – on oak woodlands, which are found on the lower elevation slopes of the Sierra Nevada, the Coast Range and other foothill areas of California.

Typically, the workshops are held in person and draw moderate-sized audiences for presentations, questions and answers, and field trips. Because of the COVID-19 pandemic, this year's workshop was offered online in April with pre-recorded presentations available for viewing at the participants' convenience and a live question-and-answer session on Zoom.

The retooled event garnered 500 registrants, over 300 views of the YouTube videos and 140 participants in the live Q&A session. The presentations and Q&A session are still available online for future viewing as well at http://cemendocino.ucanr.edu/Forestry/Workshops/California_Oak_Health.

“People from all walks of life participated, including those with professional and personal interest in oak woodlands,” said Yana Valachovic, UCCE forest advisor in Humboldt and Del Norte counties and a conference organizer.

UCCE research on the impact of conifer encroachment helped facilitate policy changes that make it easier for California landowners to remove conifers from oak woodlands. (Photo: Yana Valachovich)

 

Presentations at the 2020 conference included the following topics:

Encroachment by Douglas-fir

In Northern California, the biodiversity of oak woodlands is being threatened by Douglas-fir encroachment. The oaks' shade helps the young conifers get established with protection from harsh sun. In time, the fast-growing Douglas-fir trees pierce the oak canopies and begin to crowd out the areas' native understories, which are important for the diversity of birds, mammals and reptiles attracted to oaks.

As the Douglas-fir continue to grow and multiply, they threaten the very lives of the oak trees and the unique ecosystem they dominate.

To better understand the Douglas-fir encroachment, Valachovic established 10 research sites in Humboldt and Mendocino counties to gather information about the fate and the age of oaks. She and her research partners determined the ages of the oaks and firs, and counted the seedlings, saplings, snags and understory vegetation.

“With this research, we were able to demonstrate that even though the oak trees can be smaller in diameter, they are much older than the Douglas-fir trees,” Valachovic said. “The encroachment process is happening quickly, and the oaks are falling out of the system.”

The shift appears to have been initiated in the mid-19^th and early-20^th centuries, coinciding with the Gold Rush and wildfire suppression.

With the data confirming Douglas-fir encroachment, Valachovic turned her attention to oak woodland restoration. At 14 sites in Humboldt and Trinity counties, her team studied the effects of Douglas-fir removal.

“Grasses and forbs under the oaks reestablished. Diameter growth on the oaks increased,” she said.

These research findings contributed directly to changes in policy that had previously limited landowners' ability to remove and sell conifers encroaching on oak woodland. The research also helped create new funding opportunities to support oak woodland restoration and conservation in Northern California.

The River Fire, which burned through much of the UC Hopland Research and Extension Center in 2018, provided many opportunities to study the regenerative aspects of fire on oak woodland.

 

Case study of oak woodland wildfire recovery

In July 2018, about two-thirds of the 5,289-acre UC Hopland Research and Extension Center was burned by the River Fire.

The transformation of the land, which had likely been without a large wildland fire for at least 100 years, was intense and stressful, said UC Cooperative Extension forest advisor Michael Jones. However, it also provided a unique opportunity for researchers to compare the impact of wildfire on the resiliency of vegetation on grazed and ungrazed oak woodland.

Jones established 35 one-fifth acre research plots at the research center and collected data two months following the fire and one year later. The research will continue in the future to better understand long-term impacts, but Jones was able to share revealing early results at the workshop.

Right after the fire, in severely burned areas areas, the future of the oaks looked ominous. Jones predicted 40% tree mortality.

“The oaks were exposed to persistent, intense heat. They were cooked,” he said. “But two months after the fire, we were already seeing basal sprouts. This was an amazing response by the trees. Oaks are pretty damn tough.”

A year after the fire, surveys showed that tree mortality in the burned areas was 25%, much less than Jones' early predictions. While some management for specific situations in severely burned areas may be necessary – such as removal of hazard trees, reducing fuels in defensible spaces or removal to control invasive species – the results of this work show the trees recover naturally.

“Esthetically, I know these systems aren't as pleasing as they were before, but ecologically, they are healthy and recovering,” he said. “In 100 years, it will look just as good as before the fire.”

John Bailey, right, director of the UC Hopland Research and Extension, speaks with UC ANR vice provost Mark Lagrimini where fire impact was evident shortly after the fire. The pasture on the left of the fence was grazed, the area on the right was not grazed.

 

Fire impacts in woodland areas previously grazed and not grazed

The fire on the research station also permitted Jones to compare the fire's differing impact on non-grazed and grazed oak woodland. At first, the grazed areas looked almost unscathed with minimal flame scorching on the bark, while an area where the pasture hadn't been grazed for 25 years had evidence of much higher severity fire.

“Grazing is a phenomenal way to help manage fuels,” Jones said. However, the grazed areas displayed ecological shortcomings a year later.

“In grazed pastures, the large mature trees were still alive, but there was no oak regeneration (basal sprouting or seedlings),” Jones said. “In the ungrazed area, a lot of biomass had been killed, but there's nearly 100% resprout of oak trees and we have an impressive amount of oak seedling recruitment.”

Jones said he isn't discouraging grazing.

“But it is important to protect sites from grazing, and especially wildlife browse, when a landowner or land managers' objectives are to regenerate or conserve oak woodlands,” Jones said.

A ball point pen points to a Mediterranean Oak Borer, indicating its tiny size.

 

New ambrosia beetle another threat to California oaks

Akif Eskalen, UC Cooperative Extension specialist in the Department of Plant Pathology at UC Davis, has identified a new insect-fungus team that causes oak borer wilt in Northern California Valley and Blue Oaks. It is an ambrosia beetle, commonly known as Mediterranean Oak Borer, which carries several fungi in its mouth. The beetle bores into the tree and introduces fungi to grow for food. The fungi spreads and disturbs the transportation of water and nutrients, causing wilt in the tree.

The oozing and staining lesions on the bark are similar to other oak fungal diseases, such as sudden oak death. The beetle – native of Mediterranean basin countries in Africa, Asia and Europe – cannot fly far, so most likely is transported for long distances on infested firewood.

During the workshop, Eskalen suggested not moving firewood, removing heavily infested trees and chipping infested wood into 1-inch particles to reduce the spread of the ambrosia beetle and its fungal partner. He asked viewers to report any suspected oak tree infestations to the local agricultural commissioner, CDFA Diagnostic Laboratories, UC Cooperative Extension advisors or CALFIRE. Chemical options for sparing oaks from the ambrosia beetles' devastation are under investigation.

A botanical specimen of Ione manzanita, a federally listed threatened species, is susceptible to root rot caused by introduced Phytophthora in its natural range. (Photo: Wikimedia Commons)

 

 

Threats to oaks and other native plants from root rotting Phytophthora

Restoration plantings have inadvertently introduced plant pathogens to native oak woodland  ecosystems in California, said Ted Swiecki of Phytosphere Research, an organization that provides consulting services related to natural resource management, horticulture, urban forestry and agriculture. The group of pathogens causing the damage are largely from the Phytophthora genus, first described in the 1860s. The name translates from Greek to “plant destroyer.” 

Swiecki has observed when Phytophthora infested plants and soils are introduced to native habitats, the pathogens can attack various native plants, including toyon, madrone, manzanita and full-grown oaks. Once established, the pathogen can spread along drainages, by moving soil from one area to another and by hitchhiking on equipment, tires and hiking boots.

The pathogen can easily be overlooked at nurseries, which, by their nature, have conditions that favor Phytophthora development. Plants at nurseries are well watered, have high root density and are often placed on the ground where they can pick up pathogens.

He said the best approach to tackling Phytophthora is not using nursery stock for restoration or beautification of natural oak woodland. Direct seeding, using natural regeneration, or onsite propagation are safer ways to enhance vegetation in oak woodland.

“It's easier to prevent Phytophthora from being introduced in the first place and much cheaper and more effective than trying to eradicate it later,” Siewcki said.

Reposted from the UC Berkeley News

A team of collaborators including the citizen science project SOD Blitz have detected the first cases of the infectious tree-killing pathogen Phytophthora ramorum in California's Del Norte county.

The pathogen, a fungus-like water mold that causes sudden oak death, has ravaged millions of native oaks and tanoaks along California's central and northern coasts since it was first introduced in the United States in the late-1980s.

The discovery in Del Norte marks the first time that sudden oak death has been found in a new county since the its emergence in nearby Trinity county in 2014, and brings the total number of affected California counties to 16.

“Now every California coastal county between Oregon's Curry County and the very southern border of Monterey County are infested, although the extent and distribution of infested areas within each county is extremely variable” said Matteo Garbelotto, an adjunct professor of environmental science, policy and management at the University of California, Berkeley, and founder and director of the SOD Blitz program.

“If the infestation in Del Norte were to expand, not only it would affect local resources, but it would also provide a bridge connecting the genetically distinct Oregon and California infestations, possibly further facilitating the adaptation of the pathogen to West Coast coastal forests,” said Garbelotto, who also serves as cooperative extension specialist for University of California Agriculture and Natural Resources. “It's a good thing that we detected it, because the sooner we know, the more options are available to minimize the impact of the disease.”

Each year, the University of California, Berkeley-led SOD Blitz project has employed volunteers from around the state to scour their local forests for signs of new outbreaks of the pathogen. Del Norte County has been monitored for these signs since 2004 by collaborators from UC Cooperative Extension, UC Berkeley, UC Davis, and Cal Fire. This year, the SOD Blitz brought additional sampling infrastructure and diagnostic expertise to the effort.

The two infected trees are located in Jedediah State Park about five miles east of Crescent City. (Photo by Yana Valachovic)

Hundreds of tree samples from uninfested San Luis Obispo county were also tested as part of this year's SOD Blitzes, but no cases were found.

The strain identified in Del Norte is the one called NA1, which is commonly found in California, rather than the emergent and potentially deadlier EU1 strain common in Europe and recently detected in Oregon.

The new finding has been reported to the California Department of Food and Agriculture (CDFA), and has no regulatory implications until the results are officially confirmed by the CDFA.

A new threat in Del Norte

The two infected trees in Del Norte county are located in Jedediah State Park about five miles east of Crescent City, reports Chris Lee, a forest pathologist with Cal Fire who organized this year's SOD Blitzes in Humboldt and Del Norte counties.

“The tanoak trees are located among old-growth redwoods, pretty far from the existing infestations we know of in Oregon and in northern Humboldt County,” Lee said. “Fortunately, past experiences indicate that redwoods suffer only minor damage from this pathogen. Little to almost no mortality of other tanoaks can be observed in the immediate surroundings at this site so far.”

The researchers also conducted follow-up testing on surrounding trees in the area but no additional cases of the pathogen were found.

“We have been monitoring this county for years and I had been hopeful that it would be spared from the disease,” said Yana Valachovic, forest advisor and county director for the UC. Cooperative Extension office in Del Norte and Humboldt Counties and co-sponsor of the Humboldt-Del Norte SOD Blitz. “A round of secondary sampling in nearby trees did not yield the pathogen making it difficult to speculate how the disease may have arrived and the extent of the infestation. Over the coming months we will be working with the landowners and managers of the region to help them assess the situation.”

Two volunteers collect samples during an SOD blitz. (UC Berkeley photo by Doug Schmidt, Garbelotto Laboratory)

More than a decade of Blitzes 

Since Garbelotto launched the SOD Blitzes in 2007, thousands of volunteers have combed through California's coastal forests in search of signs of Phytophthora ramorum, the pathogen, which causes oozing cankers, browning leaves, and eventual death in infected oak and tanoak trees.

“The Blitzes started because we were and still are facing the necessity of precisely defining the extent of the SOD infestation over a gigantic range, and it was basically impossible for us to hire enough people to actually survey they entire coast of California,” Garbelotto said.

For each Blitz, Garbelotto partners with local organizations to recruit and organize volunteers. After a short training session, participants, many of whom are private landowners, survey a designated area for hints of the pathogen, which is often spread through infected bay laurel leaves and tanoak twigs.

Suspicious-looking leaves and twigs, along with details about the location, are sent to Garbelotto's lab at UC Berkeley, where they undergo a rigorous analysis and DNA testing to confirm the presence of the pathogen.

Every fall, their findings are combined with data from researchers as well as state and federal government agencies and made publicly available on the web (www.SODmap.org).

Every year, the results of the SOD Blitzes are compiled data from state and federal government agencies and made publicly available on the web. Green icons identify the locations of tree samples that tested negative for the sudden oak death pathogen, and red icons indicate trees that that tested positive for the pathogen. (UC Berkeley image by Doug Schmidt, Garbelotto Laboratory)

“Everybody who attends the SOD Blitzes is great, they are really interested and want to protect their trees,” said Kim Corella, a forest pest specialist at CalFire who has been organizing the SOD Blitzes in San Luis Obispo county since 2013.

In 2019, there were 22 local SOD Blitzes ranging from San Luis Obispo county in the south to Del Norte in the north. A total of 455 volunteers participated, 16227 trees were surveyed and 9000 leaves from 1732 trees were sampled and tested at UC Berkeley.

Though the SOD Blitzes have identified a number of new outbreaks, this is the first time that the project has uncovered infections in a new county.

“Our citizen science program run by UC Berkeley has been successful thanks to many collaborators, including UC Cooperative Extension, Cal Fire, the California Native Plant Society and the San Francisco Public Utilities Commission, just to name a few,” Garbelotto said. “Our project is providing key research findings to protect California Natural resources, highlighting the relevance Citizen Science has in the modern world.”

The project is supported by the US Forest Service, State and Private Forestry as well as the National Science Foundation, the Gordon and Betty Moore Foundation and the Pg&E Foundation.