- Contact: Jeannette Warnert, (559) 240-9850, jewarnert@ucanr.edu
The findings suggest many models of wildfire predictions do not accurately account for anthropogenic factors and may therefore be misleading when identifying the main causes/drivers of wildfires. The newest model proportionately accounts for climate change and human behavioral threats and allows experts to more accurately predict how much land is at risk of burning in California through 2050, which is estimated at more than 7 million acres in the next 25 years.
Climate change affects the severity of the fire season and the amount and type of vegetation on the land, which are major variables in predicting wildfires. However, humans contribute another set of factors that influence wildfires, including where structures are built, and the frequency and location of ignitions from a variety of sources—everything from cigarettes on the highway, to electrical poles that get blown down in Santa Ana winds. As a result of the near-saturation of the landscape, humans are currently responsible for igniting more than 90 percent of the wildfires in California.
“Individuals don't have much control over how climate change will effect wildfires in the future. However, we do have the ability to influence the other half of the equation, those variables that control our impact on the landscape,” said Michal Mann, assistant professor of geography at George Washington University and lead author of the study. “We can reduce our risks by disincentivizing housing development in fire-prone areas, better managing public land, and rethinking the effectiveness of our current firefighting approach.”
The researchers found that by omitting the human influence on California wildfires, they were overstating the influence of climate change. The authors recommend considering climate change and human variables at the same time for future models.
“There is widespread agreement about the importance of climate on wildfire at relatively broad scales. At more local scales, however, you can get the story quite wrong if you don't include human development patterns,” said co-author Max Moritz, UC Cooperative Extension fire ecology specialist whose lab is at the University of California, Berkeley. “This is an important finding about how we model climate change effects, and it also confirms that getting a handle on where and how we build our communities is essential to limiting future losses.”
Between 1999 and 2011, California reported an average of $160 million in annual wildfire-related damages, with nearly 13,000 homes and other structures destroyed in so-called state responsibility areas - fire jurisdictions maintained by California, according to Mann. During this same period, California and the U.S. Forest Service spent more than $5 billion on wildfire suppression.
In a model from 2014 that examined California wildfires' destruction over the last 60 years, Dr. Mann estimated that fire damage will more than triple by mid-century, increasing to nearly half a billion dollars annually. “This information is critical to policymakers, planners, and fire managers, to determine wildfire risks,” he said.
The paper, “Incorporating Anthropogenic Influences into Fire Probability Models: Effects of Human Activity and Climate Change on Fire Activity in California,” published Thursday in PLOS ONE.
Press release written by Emily Grebenstein, George Washington University, emgreb@gwu.edu, 202-994-3087
In 2009, more fruits, vegetables, whole grains and low-fat milk were included in the food package provided by USDA's Special Supplemental Nutrition Program for Women, Infants and Children (WIC). As a result, the quality of diets improved for the roughly 4 million children who are served by WIC, according to a study by researchers at UCSF Benioff Children's Hospital in Oakland, UC San Francisco and UC Agriculture and Natural Resources' Nutrition Policy Institute.
“Although the findings only showed significant improvement for consumption of greens and beans, the other areas for which WIC has put in important efforts – increased consumption of whole fruits rather than fruit juice, increased whole grains – all show trends in the right direction,” said lead author June Tester, a physician at UCSF Benioff Children's Hospital Oakland, “and there is opportunity for further study in the future when more years have passed after this landmark change in the WIC package.”
Diets of children age 2 to 4 compared
For the UC study, which will be published in the May issue of Pediatrics journal, researchers analyzed the diets of 1,197 children, ages 2 to 4 years, from low-income households before and after the 2009 change in the food package.
The researchers used the National Health and Nutrition Examination Survey (NHANES) to compare a nationally representative sample from 2003 to 2008 with diets in 2011 to 2012. The researchers calculated the Healthy Eating Index (HEI-2010), which is a score with 100 possible points measuring adherence to dietary guidelines, from two 24-hour diet recalls. For children in households using WIC, this score increased from 52.4 to 58.3 after the policy change. After adjusting for characteristics in the sample and trends in the comparison group, the researchers showed that there was an increase of 3.7 points that was attributable to the WIC package change. This represents important evidence of an improvement in the diets for these children in WIC households.
Children don't eat enough green vegetables
“Vegetables are part of a healthful diet, but in general, children don't eat enough of them,” Tester said. Using the Healthy Eating Index, the researchers calculated the Greens and Beans score, which counts dark green vegetables and includes any legumes, such as beans and peas, that were not already counted as protein foods on a different score.
After the food package was changed, the Greens and Beans score increased for children in WIC but not for their counterparts. Roughly half of the children in WIC households had eaten some vegetables, whereas only one in five non-WIC children had consumed any green vegetables at all in the two days their parents were surveyed.
Important policy change
The change in the WIC food package is an important policy change in the effort to improve the quality of diets of young children, said Tester, a pediatrician.
Tester noted that the results of this study will be useful to the Institute of Medicine committee that is reviewing and assessing the nutritional status and food needs of the WIC-eligible population and the impact of the 2009 revision to WIC food packages. The committee will make recommendations for changing the food packages.
Establishing healthy eating patterns
“Increasing consumption of nutritious foods such as green leafy vegetables and whole grains in the low-income children served by WIC will help them establish healthier eating patterns for their future,” said co-author Patricia Crawford, UC Cooperative Extension nutrition specialist with UC ANR's Nutrition Policy Institute.
The switch from whole milk to low-fat milk was well received by the clientele and did not result in decreased milk consumption among the preschoolers, noted Tester, Crawford and co-author Cindy Leung, postdoctoral scholar at UCSF Center for Health and Community.
This study is the first to report on the significant improvements in diet quality in young children associated with the WIC package change using a nationally representative sample, and the first to do so with the updated Healthy Eating Index (HEI-2010). The National Institutes for Health funded this study.
Para leer la versión en español de este artículo, visite http://ucanr.edu/sites/Spanish/Noticias/?uid=6735&ds=199.
- Author: Jeannette E. Warnert
A tell-tale sign of spring in California is a flush of new leaf growth on citrus trees. Because the feathery light green leaves are particularly attractive to Asian citrus psyllids (ACP), the leaves' emergence marks a critical time to determine whether the pest has infested trees.
“We encourage home citrus growers and farmers to go out with a magnifying glass or hand lens and look closely at the new growth,” said Beth Grafton-Cardwell, UC Agriculture and Natural Resources (UC ANR) citrus entomologist. “Look for the various stages of the psyllid – small yellow eggs, sesame-seed sized yellow ACP young with curly white tubules, or aphid-like adults that perch with their hind quarters angled up.”
Pictures of the Asian citrus psyllids and its life stages are on the UC ANR website at http://ucanr.edu/acp. If you find signs of the insect, call the California Food and Agriculture (CDFA) Exotic Pest Hotline at (800) 491-1899.
Asian citrus psyllids are feared because they can spread huanglongbing (HLB) disease, an incurable condition that first causes yellow mottling on the leaves and later sour, misshapen fruit before killing the tree. ACP, native of Pakistan, Afghanistan and other tropical and subtropics regions of Asian, was first detected in California in 2008. Everywhere Asian citrus psyllids have appeared – including Florida and Texas – the pests have found and spread the disease. A few HLB-infected trees have been located in urban Los Angeles County. They were quickly removed by CDFA officials.
“In California, we are working hard to keep the population of ACP as low as possible until researchers can find a cure for the disease,” Grafton-Cardwell said. “We need the help of citrus farmers and home gardeners.”
Grafton-Cardwell has spearheaded the development of the UC ANR ACP website for citrus growers and citrus homeowners that provides help in finding the pest and what to do next. The site has an interactive map tool to locate residences and farms that are in areas where the psyllid has already become established, and areas where they are posing a risk to the citrus industry and must be aggressively treated by county officials.
The website outlines biological control efforts that are underway, and directions for insecticidal control, if it is needed. An online calculator on the website allows farmers and homeowners to determine their potential costs for using insecticides.
There are additional measures that can be taken to support the fight against ACP and HLB in California.
- When planting new citrus trees, only purchase the trees from reputable nurseries. Do not accept tree cuttings or budwood from friends or relatives.
- After pruning or cutting down a citrus tree, dry out the green waste or double bag it to make sure that live psyllids won't ride into another region on the foliage.
- Control ants in and near citrus trees with bait stations. Scientists have released natural enemies of ACP in Southern California to help keep the pest in check. However, ants will protect ACP from the natural enemies. Ants favor the presence of ACP because the psyllid produces honeydew, a food source for ants.
- Learn more about the Asian citrus psyllid and huanglongbing disease by reading the detailed pest note on UC ANR's Statewide Integrated Pest Management website.
- Assist in the control of ACP by supporting CDFA insecticide treatments of your citrus or treating the citrus yourself when psyllids are present.
- Support the removal of HLB-infected trees.
The loss of oak woodlands in California's North Coast is a critical conservation concern because it is associated with losses of biodiversity and wildlife habitat, range values, cultural resources, and other oak-dependent ecosystem services. In the absence of natural disturbances like fire, conifers can outcompete deciduous oaks and eventually the oaks die. In recent years, the effects of conifer encroachment on oaks have become a focal point for UC Agriculture and Natural Resources, which has conducted important research on oak woodland conservation in Humboldt and Mendocino counties.
“UC ANR research has shown that conifer encroachment is threatening oak woodlands throughout the North Coast. This project is really exciting because it will give landowners the resources they need to restore their oak stands — resources that haven't been there in the past,” said Lenya Quinn-Davidson, UC ANR Cooperative Extension staff research associate, who led development of the project proposal.
Oak woodland restoration requires removing conifers from oak stands with prescribed fire or by cutting down the conifer trees.
“The North Coast Oak Woodland Conservation Project will provide technical guidance and resources for landowners who wish to restore or conserve their oak woodlands, and foster a strong alliance of organizations and agencies who can continue oak woodland conservation efforts into the future,” said Quinn-Davidson, who is based in Eureka.
For more information about the project or funds for oak conservation activities on private lands, contact Quinn-Davidson at lquinndavidson@ucanr.edu and (707) 445-7351.
The North Coast Oak Woodland Conservation Project was one of six projects in California selected for Regional Conservation Partnership Program funding. The funded projects focus on a range of issues, including bird habitat, climate change and forest health. The program, which is funding 84 projects totaling $220 million nationwide, is highly competitive, requiring strong partnerships that address critical conservation issues.
"We are excited and energized by these new projects that bring together a diverse mix of partners to improve California's ecosystems and landscape," said Carlos Suarez, Natural Resources Conservation Service state conservationist. "It is very powerful to be able to engage in partnerships that embrace both agricultural and environmental interests and perspectives—and find collaborative ways of making progress on critical issues."
Partners in the North Coast Oak Woodland Conservation Project include University of California Cooperative Extension, CAL FIRE, the Watershed Research and Training Center, the North Coast Regional Land Trust, the U.S. Fish and Wildlife Service, the Mattole Restoration Council, Yager/Van Duzen Environmental Stewards, and the Mendocino County Resource Conservation District.
Frerichs, who has served as a Davis city councilman since 2012, started his position with UC ANR on Jan. 4. In his new position, Frerichs will work with UC ANR scientists to make research-based facts more accessible to help Californians make informed policy decisions.
“I am excited to use my experiences working in state and local government to assist UC ANR in building more effective relationships with local and state elected officials and community leaders throughout the state of California,” said Frerichs.
Frerichs brings to UC ANR a decade of experience working in the California State Assembly in Sacramento. Most recently, from 2010 to 2015, he served as legislative director for Assemblyman Rich Gordon, chairman of the Assembly Rules Committee, advising him on agriculture, housing, natural resources, energy and the budget process.
“I'm amazed by the diversity of UC Agriculture and Natural Resources,” said Frerichs. “Seeing the full scope of UC ANR's footprint throughout California — whether through Cooperative Extension working as the bridge between local issues and the power of UC research, the statewide 4-H Youth Development Program, UC Master Gardener Program, UC Master Food Preserver Program, or the Statewide UC Integrated Pest Management Program — if it has to do with agriculture in California, UC ANR is there!"
Frerichs spent his childhood in upstate New York and Alaska, but has been active in the Davis community since graduating from Davis High School. He has served on the planning commission (2008–2012), innovation park task force (2010–2012), housing element steering committee (2007–2008) and social services commission (2004–2008).
In addition to the city council, Frerichs serves as vice chair for the Capitol Corridor Joint Powers Authority (Amtrak California), and as board member for the Sacramento Area Council of Governments, Yolo County Transportation District (Yolobus) and the Yolo Habitat Conservancy. He is also an appointed member of the California Tax Credit Allocation Committee.
The Sacramento State alumnus also spent nearly a decade advocating for affordable housing throughout Davis and Yolo County as president of Yolo Mutual Housing Association. During his tenure, the nonprofit association created affordable rental housing for 450 residents.
On environmental matters, Frerichs is a board member for the Yolo Basin Foundation, which oversees the management of 16,000 acres of wetland habitat in the Yolo Bypass Wildlife Area.
Frerichs received a B.A. in government from California State University, Sacramento, and earned a certificate in land use and environmental planning from UC Davis. He and his wife Stacie live in Davis with their German shorthaired pointer, Poppy, and a flock of backyard chickens.