- Author: Mike Hsu
During summer swarming season, homeowners urged to check for signs of Formosan subterranean termite
In the lottery of troublesome termite infestations, “Roger,” a Rancho Santa Fe homeowner, hit the jackpot (a pseudonym is used to protect his privacy). In 2021, his house in San Diego County was identified as home to only the fourth documented colony of the Formosan subterranean termite (Coptotermes formosanus) in California.
“FST is one of the most destructive urban pests in the world,” said University of California, Riverside entomologist Chow-Yang Lee, affiliated with UC Agriculture and Natural Resources through the campus' Agricultural Experiment Station. “It's also the only termite species listed in the ‘100 of the World's Worst Invasive Alien Species.'”
Endemic to East Asia, this termite is now established in many tropical and subtropical regions, including across the American South. Annually, its infestation costs more than $4 billion in control measures and damage repairs of structures in the U.S.
FST was first discovered in California in La Mesa (San Diego County) in 1992, and it was rediscovered in that city in 2018. Another infestation was reported in Canyon Lake (Riverside County) in 2020. And then, the following year, Roger received his surprise.
“Imagine being in your kitchen looking at your drywall and it's totally normal and then the next day there's a four-inch hole there and you're like ‘What the heck is that? Who put their elbow into the drywall?'” he recalled.
FST colonies can reach millions of individuals
Roger hired a pest control company, Green Flash Pest Control, which sprayed a powerful liquid termiticide in the soil around the house. But the termites – workers, soldiers and winged “alates” – continued to appear. The company tried a second application of soil treatment. But, again, the termites kept popping up.
“We were deeply concerned about the potential damage these termites could cause to the home since these invasive termites are extremely destructive,” said Eric Veronick, director of operations at Green Flash. “Unfortunately, there isn't a whole lot of information available on the behavior and management of this termite in California.”
The company called upon Siavash Taravati, a UC Cooperative Extension urban Integrated Pest Management (IPM) advisor based in Riverside.
“Some colonies are aerial, meaning that they are formed above the ground with limited or no connection to the soil – in such cases, soil treatment using contact insecticides may not be very effective in managing these termites,” Taravati said. “Furthermore, contact insecticides usually kill a much smaller portion of the colony when compared to termite baits.”
To make matters worse, once FST is established in an area, there have been no records of successful eradication anywhere in the world, according to Taravati. He added that a major reason why the Formosan subterranean termite is so destructive is the enormous size of their colonies.
“Their colonies can reach millions of individuals, versus most native subterranean species that reach a few hundred thousand individual termites per colony,” Taravati explained.
This termite, through its sheer numbers, can turn the wood in a structure into a “spongy kind of cake,” in Taravati's words. More than 10 pounds of wood in a house can be eaten by a mature colony each month. The financial hit for a homeowner can be substantial, up to tens of thousands of dollars – not to mention the increased risks to safety.
“Anything from studs to rafters to door frames and window frames – everything is going to be compromised, if the termites are left unchecked. And then, as soon as we have a major stress on the building, let's say there's a big storm or an earthquake – there's a high risk of at least part of the building collapsing,” said Taravati, who also noted that, unlike California native subterranean termite species, FST can attack and kill live trees and plants.
“These termites can be a nightmare,” he said.
Summer is ‘swarming season' for FST
Since the Rancho Santa Fe case in 2021, four more colonies have been documented, in La Mesa again and also in Highland Park, Hollywood Hills and La Verne (the latter three in Los Angeles County). Taravati said it's possible that FST has been spreading via structural lumber or potted plants and soil.
And even if a colony appears to be eliminated at a certain locale, Taravati noted, there is always the chance that part of the colony survives or more colonies of termites already have been established in nearby locations, as a result of swarming termites from the originally infested property.
Although nominally “subterranean,” certain members of an FST colony grow wings and fly to nearby locations to establish new colonies. These winged alates are also called swarmers because of their behavior during the “swarming” season, when termites mate and reproduce.
For the Formosan subterranean termite, that swarming season in California is late May through early August, so now is the time for homeowners and building managers in southern and central California to keep an eye out for those winged termites.
“If you experience a termite swarm in your house, contact a pest management professional and keep some termite samples in a Ziploc bag in the event you need to send the samples to UC Riverside for morphological and DNA-based identifications,” said Lee, who added that it's a good idea to periodically check your structure for signs of infestation, such as wood damage or shelter tubes (mud tubes).
Lee said FST swarmers have a lighter colored body compared to the dark color of native subterranean termites and the orange-brown body of drywood termite swarmers (see this flyer for additional identification information).
Following an especially wet winter, there's a chance California could see more FST infestations, as this termite generally requires moist environments to thrive, Lee added. He recommends that concerned community members seek professional advice.
“Do not attempt to control an FST infestation by yourself,” Lee said. “This is not your typical native Californian subterranean termite species; they are highly destructive, and you want to intercept the problem with the right strategy before it's too late.”
Homeowner: ‘I owe them my house'
In Roger's case, Taravati enlisted the help of Lee and his UC colleague, Greg Kund. They made multiple visits to inspect the home and analyze the situation – going “above and beyond,” according to Roger.
At Lee's suggestion, they used a caulk gun to insert a gel-like experimental bait into the wall where the termites were coming out. Once spread and passed on to the other nestmates, the product – which contains a chitin synthesis inhibitor (a type of insect growth regulator) – interrupts the termites' development so they are unable to properly molt and replace the short-lived “workforce” of foragers and soldiers. The colony eventually collapses and is eliminated.
“Generally speaking, IGRs are much more effective, but they require more patience,” Taravati explained. “You're not going to see the results the next day, or two-three days. You're going to see the results in a few weeks – but when you see the results, it's massive.”
And that's exactly what Roger and Green Flash Pest Control saw.
“Soon after their bait application, the termites stopped emerging from the walls and that gave us and the homeowner a big sigh of relief,” Veronick said. “I appreciate their expertise and dedication in helping us get rid of this destructive pest."
Roger said he is immensely grateful to the UC team.
“They were fantastic; I owe them my house,” he said. “They were super gracious and helpful and responsive and – ultimately, the thing I care most about – they were effective; they fixed the problem. Here we are two years later and – knock on wood, or maybe I should knock on something else! – everything is good.”
Lee also credited Taravati for bringing his knowledge and “can-do” attitude to communities across Southern California.
“He is highly knowledgeable and always able to come up with feasible solutions,” Lee said. “We need good Cooperative Extension urban IPM advisors like Siavash who could provide good advice and bring solutions to the stakeholders, be they homeowners or pest management professionals.”
Taravati said community members need to maintain their vigilance and urges them to download and share the FST flyer that includes identification tips and contact information. He said they are always free to e-mail him with their concerns and photos of suspected FST – not only to help stop the spread of the pest but to expand scientific understanding.
“This termite is so new to California – even for us, as researchers. Despite being in La Mesa since the 1990s, it wasn't until 2020 when these termites were detected in other places, including Riverside and Los Angeles counties,” Taravati explained. “All of us need to learn more about this pest and closely monitor the behavior of this pest.”
/h3>/h3>/h3>/h3>- Author: Mike Hsu
Master Gardener volunteers partner with County of San Diego on new demonstration garden
In a garden with roughly the square footage of a two-car garage, the University of California Master Gardeners and County of San Diego staff have packed a whole lot of learning for the community.
The demonstration garden, which had its grand opening last fall, is now flourishing in its 20-by-20-foot space in a plaza at the heart of the San Diego County Operations Center. Skilled volunteers with San Diego's UC Master Gardeners, a program of UC Agriculture and Natural Resources, maintain its containers of vegetables and herbs, succulents, and native and pollinator plants.
“For such a little garden, there's a lot to look at,” said Karen Morse, a Master Gardener volunteer who helped establish the “demo garden” – a highly visible and accessible teaching tool for the many people who work and conduct business in the surrounding offices.
“We get questions from people just walking by – from the public, from county employees – all the time,” said Leah Taylor, UC Master Gardener program coordinator in San Diego County. “While we're doing what we're doing in the garden, we're a presence for people to just get a quick bite of education.”
The garden also features a “Little Free Library” of gardening books, as well as a compost bin and rain barrel for demonstration purposes. There are also signs (in English and Spanish, as well as additional languages on the garden's website) offering tips on composting/worm composting, pest management, water conservation, climate adaptation, sustainability practices, and health and nutrition. The expertise of a host of county departments and agencies inform the resources.
“The most beautiful thing about that garden is not necessarily the plants – although we love our plants – it's that it showcases almost every county department…all represented in one place and you can find how to connect with those groups, all in one place,” Taylor explained.
During planning for a broader revamp of the Operations Center grounds, the county had approached the Master Gardeners to provide guidance on a public demo garden.
“The County has a long-standing commitment to sustainability and partnership with the University of California Cooperative Extension,” said Rebeca Appel, program manager for the county's Land Use and Environment Group, which spearheaded the effort through the “Live Well San Diego” Food System Initiative. “So it was a natural approach to work with the Master Gardeners with their robust community garden program, and educational outreach in home and urban gardening throughout our region.”
The vision for the garden was shaped by county teams working with Joan Martin and Ellen Cadwallader, co-chairs of the Master Gardener committee that oversees the program's demonstration gardens across San Diego County, including those at Balboa Park and The Flower Fields in Carlsbad.
And while those gardens help raise awareness among the many visitors at those sites, Martin said the newest demo garden provides unique opportunities for ongoing community education, such as lunch-and-learns on specific gardening topics.
“This is the garden where there's really a chance for year-round education and sessions,” Martin said. “We're excited to see it get started and watch it grow.”
Morse and fellow Master Gardener Sandy Main collaborated with Appel to bring those early plans and objectives to verdant life.
“I think we ticked all the boxes of everything they wanted, initially – examples of container gardening, natives, vegetables, herbs, pollinators – and wheelchair accessible,” Morse said.
They have since passed the botanical baton to Skye Resendes, a relatively recent graduate of the Master Gardener certification program. She will coordinate a team of a dozen volunteers in the ongoing upkeep of the County Operations Center demo garden.
Resendes, who uses gardening to help her cope with the stresses of her work as a civil litigator, said she hopes the garden will not only inform the community on crucial ecological and conservation topics but also inspire more people to start their own gardens.
“The science is out there – there are huge mental health benefits to gardening,” Resendes said. “It's an absolute meditation.”
/h3>- Author: Robert Padilla
In the mid-1990s, Manglallan helped to develop the California School-Age Child Care Center for Action. She led the creation of childcare programs for school age children at parks and recreation centers and has served as the principle investigator on many projects, such as Off to a Good Start and the Afterschool Life Skills Evaluation Project.
In 2009, under Manglallan's guidance, 4-H partnered with the U.S. military to provide youth development activities for San Diego County children of military men and women deployed all over the world. 4-H clubs were chartered in eight military youth centers. Manglallan and her 4-H staff trained the youth center staff, set up clubs and organized military youth activities.
Through the ongoing 4-H military partnership, children of military members participate in leadership projects, community service projects, mentoring programs and sciences projects. They also attend conferences and camps with other military kids throughout the state and the country. Since 4-H has reached out to military youth, enrollment numbers have grown from 500 to the current enrollment of 1,300 children and teens in San Diego County.
Out of these efforts, four focus group meetings were held with local and non-governmental agencies, tribal members, members of the public and current 4-H volunteers. The engaged and lively discussions soon formed the basis for the current 4-H VMO board, which began in 2015 and oversees and directs local 4-H activities.
Since its inception, the VMO has organized and overseen two major fundraising events for local 4-H programming needs. Its annual 4-H golf tournament garners $8,000 to $10,000 per year and the petting zoo at the annual San Diego County Fair brings in $10,000 to $12,000 each year. Additionally, three new traditional 4-H clubs and one spin club have joined the San Diego County 4-H family.
Manglallan began her career as a 4-H agent in 1978 with the University of Arizona before eventually joining UCCE San Diego in 1983.
Over the years, Manglallan's colleagues have sought her expertise and collaboration for research, education and outreach endeavors. In April 2018, she was part of the statewide team UC ANR honored with its Distinguished Service Award for outstanding research in Youth Retention Research. Through her contributions to San Diego's local 4-H clubs and programming over the past three decades, Manglallan has developed a diverse and robust community for youth development and leadership in San Diego.
The UCCE San Diego office congratulates Manglallan on a well-earned retirement and will continue to inspire and train youth through the 4-H program by her example.