- Author: Mackenzie Faith Patton
The invasive pest spotlight focuses on emerging or potential invasive pests in California. In this issue we are covering West Nile virus.
West Nile Virus Facts
West Nile virus disease was first reported in California in 2003 and has become the most common and serious vector-borne disease in California. With the exceptionally wet weather in 2023, reported cases of this mosquito-borne virus doubled compared to the previous year.
West Nile virus is spread by mosquitoes in the genus Culex. Usually, the virus passes between mosquitoes and birds, but mosquitoes can also transmit the virus to humans, horses, and other domestic animals.
Because mosquitoes can get the virus from birds, monitoring bird populations and recording dead birds is one of the most important ways to track this disease.
What can you do?
The best way to prevent the spread of West Nile virus is to reduce mosquito populations through controlling the mosquito larval stages. Whenever possible, standing water should be drained, since mosquito larva can grow in as little as a few ounces of water. Clean gutters and storm drains to ensure water does not collect there. In areas that cannot be drained or mosquito-proofed, such as ponds, neglected pools, or unsealed rain barrels, there are some biocontrol options like Bacillus thuringiensis (Bt) that can reduce mosquito populations. In addition to these preventative measures, protect yourself from adult mosquito bites by using mosquito repellents or wearing long-sleeved shirts and long pants.
For more information on mosquito control and protecting yourself from mosquito-borne diseases, visit the UC IPM pages on mosquitoes. To report dead birds and view more information on West Nile in California, visit Westnile.ca.gov.
[Originally featured in the Spring 2024 edition of the Home & Garden Pest Newsletter]
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- Author: Michael Hsu
Nutrition Policy Institute researcher developed techniques that help identify effective public health programs
When Suzanne Rauzon and May Wang were in the master's of public health program at the University of California, Berkeley during the mid-1980s, Wang knew that her classmate had unique brilliance to bring to their field.
“You know how you vote for the person in high school who's most likely to succeed? That was Suzanne,” said May Wang, a professor of community health sciences in the UCLA Fielding School of Public Health. “Suzanne was always ahead of every one of us; she was so visionary and forward-thinking and I think we were all – to be honest – a little bit in awe of her.”
Decades later, as Rauzon prepares to retire in January 2024 as director of community health at the Nutrition Policy Institute, she has fulfilled that exceptional promise. Her many contributions are helping communities identify the most effective programs to benefit public health.
Lorrene Ritchie, director of NPI (an institute under UC Agriculture and Natural Resources), said that Rauzon has played a pivotal role in translating research findings into community action and policy change. She added that Rauzon has brought an extraordinary combination of strategic vision for the overall direction of nutrition studies and tactical savvy to anticipate the needs of project funders and communities.
“Few people can bring both of those skills – efficiently complete the day-to-day tasks as well as be a big-picture thinker,” Ritchie said. “She has been so instrumental in contributing to NPI's impacts.”
A unique skill set to tackle complex challenges
Part of what makes Rauzon unique in her field is her extensive experience in the private sector. After attaining her master's degree, Rauzon developed a comprehensive employee worksite wellness initiative at a telecommunications company – a new set of programs that led the field in the 1990s.
“Suzanne was, is and has always been very visionary,” Wang said.
After years in the corporate space, however, Rauzon leaped at the chance to return to academia (and reunite with Wang) in 2001 at UC Berkeley's Center for Weight and Health, a precursor to NPI. Working with center co-director Patricia Crawford, Rauzon said the project to investigate the effects of sugar-sweetened beverages was a “perfect fit” for her.
Concerned with rising childhood obesity, the researchers studied the significant differences in health outcomes for students in high schools that limited access to beverages such as soft drinks, versus schools that did not.
“That field in general – looking to limit sugar-sweetened beverages – started with a focus in schools, and expanded into other environments (such as college campuses) over the years, and has continued to be a focus in public health,” Rauzon said, “all the way up to work now on limiting sugar-sweetened beverages access in other public institutions.”
Rauzon's change-management and communication skills also were crucial in studying the revolutionary School Lunch Initiative in the Berkeley Unified School District – a collaboration with chef Alice Waters' Chez Panisse Foundation and the Center for Ecoliteracy to engage young people in the growing and preparation of food. Brought in to evaluate the efficacy of the program, Wang and Rauzon found they had to alter their mindset and methods when working with partners who were responding to oft-changing circumstances.
Rauzon's cross-sector perspective, practical know-how and people skills in cultivating positive relationships with district staff and educators were instrumental in successfully completing studies with as much rigor as possible in real-world settings such as schools.
The researchers created new analytical tools to evaluate health interventions developed by communities themselves – as opposed to programs engineered by academics and applied to community members with the expectation that they would accept it.
“Most researchers, to be honest, are still striving to do that with communities,” Wang said. “It is an incredibly challenging task because communities will do what they want to do – and what they need to do – to respond to the needs of people.”
Wang, who now trains academics in community-based participatory research, said that the ground-up paradigm has been shaped by Rauzon's thinking. “A lot of the ideas I have today really came about from our work together on the School Lunch Initiative,” Wang said.
A legacy of new methods, mentoring early-career professionals
One of Rauzon's longest-running – and most complex – projects has been the evaluation of community health interventions across the country, including a variety of Kaiser Permanente initiatives to promote healthy eating and physical activity.
“What was interesting about that work was we really were trying to understand the combined effects of doing a lot of different things that are related – and to see the overall effect that can have on the community,” said Rauzon, noting that interventions ranged from nutrition classes to policy changes to park and bike-safety improvements.
Wang said some of their findings, particularly from one study in Los Angeles County, suggest that effective programs are early childhood interventions (including an emphasis on breastfeeding), home visitations by nurses and social workers to vulnerable households, and partnerships with retailers to make healthy food choices more accessible.
In the process, the researchers helped pioneer new research tools – including interdisciplinary “systems mapping” approaches in which computer scientists discern linkages among various programs and their effects, and the highly influential “community intervention dose index” concept that can be used to evaluate multiple intervention strategies within a community.
In addition to Rauzon's contributions in research and evaluation, Ritchie also highlighted her role in supervising and mentoring students and NPI staff and researchers during her 20-plus years with the UC – the role in which Rauzon takes the most pride.
“While I made a contribution to community health in effective interventions and how to measure them,” Rauzon said, “I would say personally the most rewarding part of the work I've done over the last couple of decades is seeing the growth and development and advancement of people who have worked for me and who have really taken off in their own careers – that to me has been immensely satisfying.”
As an emeritus researcher, Rauzon will continue to support NPI professionals and their research, and she added that she's excited to embark on a new partnership – with her husband, a geographer – to mitigate impacts of climate change on human and environmental health across the globe.
People interested in supporting Rauzon's legacy and the ongoing work in health and nutrition can donate to NPI's Student Fellowship, which provides students from underrepresented groups the opportunity to work on NPI research and be mentored by NPI researchers.
/h3>/h3>/h3>- Author: Alireza Pourreza
UC Digital Agriculture Program's innovative spray backstop system reduces airborne pesticide drift by 78% in almond orchards– a big step forward for improving air quality and working conditions in California's agricultural production areas.
The Issue
Pesticide drift is a significant concern, especially in California's almond orchards. It's not just an environmental issue. Pesticide drift can pose a public health risk by contaminating the skin, lungs, and gut of people in nearby communities. These chemicals can lead to respiratory issues, skin irritation, and other adverse health effects. Another study highlights that pesticide poisoning is a significant cause of morbidity and mortality, affecting not just agricultural workers but also the general population.The challenge has been to control this drift without reducing the effectiveness of the pesticide application. This project aims to tackle this pressing issue head-on.
How UC Delivers
Addressing the issue of pesticide drift requires a multi-disciplinary approach, combining engineering, agriculture, and environmental science expertise. The UC Digital Agriculture Program team rose to the challenge by developing an innovative spray backstop system. This system is a blend of practicality and advanced technology, designed to be both farmer-friendly and effective in reducing pesticide drift.
The core components of this system are a foldable mast and a shade structure. The mast is the backbone, providing the necessary height and stability, while the shade structure acts as a barrier covering the trees from the top. This barrier is crucial in preventing the upward movement of pesticide droplets, thereby reducing the potential for drift.
Figure 1: Schematic design of the backstop prototype installed on a sprayer in an almond orchard.
To validate the effectiveness of this system, a series of tests were conducted in young almond orchards. The sprayer was operated at a 3.2 km/h speed to simulate real-world conditions. But before hitting the field, the team employed advanced uncrewed aerial systems equipped with thermal and RGB cameras. These cameras captured images and videos of the spray pattern from multiple angles, providing invaluable data for analysis.
The aerial imagery was not just for show; it played a pivotal role in the project. It allowed the team to monitor the spray application in real-time and understand the spray cloud's movement pattern. This imagery was then used to refine the design of the shade structure, ensuring it effectively blocked droplet movement beyond the treetop.
Figure 2: Aerial views showing the efficiency of the backstop prototype in blocking the spray cloud.
The results were more than just promising. The backstop system effectively blocked the spray cloud, ensuring that the pesticides stayed precisely where they were intended to be—on the trees. This was further validated through a ribbon test, a simple yet effective method to measure drift. A ribbon placed in the spray path remained in its resting position when the backstop system was used, indicating a significant reduction in drift.
The project didn't stop at just reducing drift; it also ensured that the reduction did not come at the cost of effectiveness. The on-target deposition of the pesticide was not compromised, affirming that the system could achieve dual objectives: reducing drift while maintaining efficacy.
The Impact
The spray backstop system's impact goes beyond just numbers. It represents a significant stride toward sustainable agriculture and community well-being. The system successfully reduced the drift potential by 78%. This isn't merely a statistic; it's a tangible change that has far-reaching implications for both environmental stewardship and human safety.
Figure 3: Statistical results showcasing a significant reduction in drift potential.
The environmental impact is equally noteworthy. Reduced drift means fewer chemicals in the air, contributing to "improved air quality," a UC ANR condition change. This is a step forward in reducing air pollution, which has wide-ranging implications for human health and climate change.
One of the most noteworthy aspects of this innovation is that it managed to reduce drift without compromising the effectiveness of the pesticide application. The on-target deposition remained consistent, ensuring the almond trees received the necessary pesticide coverage for optimal growth and yield. This is a crucial factor for farmers who are often caught in the dilemma of choosing between effective pest control and environmental responsibility.
Figure 4: Comparative leaf samples illustrating consistent on-target deposition and coverage.
The project aligns with another UC ANR's condition change, "improved living and working conditions for California's food system and farm workers." One of the goals of reducing pesticide drift is to mitigate the health risks associated with working and living in agricultural production areas. Therefore, the work directly supports UC ANR's commitment to promoting the public health of California's communities.
Looking ahead, the project has set the stage for further research and development to adapt the system for different types of orchards and terrains. Additional modifications are being considered to make the system even more robust and versatile, ensuring its long-term sustainability and broader applicability.
Want to learn more? See the method in action here.
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Many of us at UC IPM are cat lovers and owners. Cats are popular household pets that bring joy and companionship to many families. Feral cats, on the other hand, can cause problems in our communities and around our homes and gardens.
Feral cats are unsocialized, unowned cats that live outdoors. The problems they can cause are well documented. Feral cats are not treated by owners or veterinarians so they can carry contagious diseases like flea-borne typhus and rabies, and parasites like hookworm and fleas which can affect pets, humans, and other animals. Cats are also well-known hunters of songbirds and can significantly impact wildlife populations. While feral cats hunt, they do not completely control populations of house mice and rats, especially if food left for feral cats is present. Not only do the cats have access to the food, these rodents will also eat it and will continue to reproduce due to the availability of a food source.
A new resource by the UC Statewide IPM Program, Pest Notes: Feral Cats, covers the impacts and concerns associated with feral cats in California's urban areas. One of the main points made in the publication is advising people not to feed feral cats since this causes them to congregate, leading to rising populations, and potential for diseases and other problems noted above. See the Pest Notes: Feral Cats on the UC IPM website to learn more.
- Author: Julienne Cancio
Saoimanu "Saoi" Sope, UC Agriculture and Natural Resources digital communications specialist, was born on Aunu'u, an island in American Samoa, but raised in Southern California. She attended UC Santa Cruz for her undergraduate degree in film and digital media. While in the program, she felt lost compared to her peers.
“I didn't know what type of stories I wanted to tell through film, especially compared to my other classmates,” Sope said. “For a lot of them, it seemed like they had been planning on being filmmakers their entire life. This major was my backup plan.”
To gain more perspective, she took on a second major in community studies, a unique and interdisciplinary field that prepares students to apply the lessons they learn in the classroom to the real world, through a six-month field study.
Sope completed her field study at the RYSE Youth Center in Richmond, teaching Black and Brown youth how film can be used as a tool to navigate their trauma. Through this experience, Sope learned about public health, which she pursued in her master's program at Columbia University's Mailman School of Public Health.
In 2018, Sope learned about UC ANR as an employee of Driscoll's. Her boss at the time coordinated a field trip to the UC ANR office in Davis to learn more about successful agriculture communications. Four years later, in June 2022, Sope joined the Strategic Communications team.
“It was a full-circle moment,” she said. “When UC ANR posted the job description for the role I have now, I saw it and applied like anyone else. Luckily, I got an interview and now I'm here.”
When talking about her interactions with Southern California researchers and staff as a digital communications specialist, Sope attributes much of her success to her culture and upbringing. “I think one of my superpowers is that I can work with people in a way that makes them feel valued and seen and heard,” she explained.
She talked about her Samoan background, one that emphasizes the importance of hospitality. Known as the “happy people of the Pacific,” Samoans are very big on caring for and hosting others, Sope said. “How we treat others reflects our value of community,” she explained.
Sope brings this into the room with the people she is interviewing and to the impactful stories she is writing. She makes it known to her interviewees that their time is valuable and their story is worth reading.
As she grows older, Sope said, she realizes how much of her culture has influenced her work ethic. She appreciates that May is Asian American and Pacific Islander (AAPI) Heritage Month, an opportunity to celebrate and bring recognition to the beautiful and diverse cultures of marginalized communities in the U.S.
Although AAPI communities are clumped into one phrase, it is important to remember that there are many diverse groups of people within this term that are often overlooked, such as Native Hawaiians and Pacific Islanders.
When speaking about her Polynesian culture, the saying “it takes a village to raise a child” really speaks to Sope. In Samoan culture, it is common for parents to give legal guardianship of their child to other family members. In the U.S., this is formally known as adoption. This is the case for Sope; she was “gifted” to her adoptive mom by her birth mom.
“But one thing that's really beautiful about the Samoan culture is that we always know where we come from,” she said. “We know who our birth parents are…it's not a secret, and it's not shameful.”
Overall, Sope is most proud of coming from a culture that places such a high value on community. This can be seen through her influential writing, bringing awareness and attention to UC ANR staff and researchers who make great contributions to the academic world and the greater SoCal communities.
In conveying their stories, Sope said she hopes they realize and reflect on their potential and the importance of their own work.