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03.26.08

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Phaedra

Photograph by Larry Dalton
Numbers Man: Entomologist James Carey doesn't oppose eradication; he just doesn't believe that the government has any idea of the size of the problem it's trying to eradicate.

Invasive Procedures

Aerial spraying for apple moths has already raised ire on the Central Coast. With the insects now found in the North Bay, does it make sense to even try to wipe out exotic pests in an era of globalization?

By Steve Hahn


The dust swirls around Central Coast farmer Tom Broz as he surveys the empty field that will soon be sprouting Live Earth Farm's tomatoes. In a few months, he'll go through the annual ritual of hanging twist-ties drenched with pheromones around his farm to disrupt the mating of the codling moth. The ritual requires money, labor and time—three things not in excess at Broz's small organic operation. Yet for Broz, controlling pests like the codling moth is just "the name of the game" when it comes to environmentally sensitive agriculture.

Now that the light brown apple moth (LBAM), an Australian insect whose ruinous appetite is a matter of debate in ag circles, is also in the area, Broz will likely have to pencil in yet another round of twist-tie-hanging at a cost of about $120 per acre. But it's not that simple. Since both state and federal government have determined that the LBAM must be eradicated, Broz has more than just the cost of twist-ties to worry about. The feds are inspecting his orchards every month, and if they find even a single sign of the moth, he could be shut down until the inspectors are satisfied that his farm has been rid of it for good.

"Imagine if I lose one week of produce because I'm being quarantined in the middle of the season. That could add up to $20,000 or $30,000 right there," Broz says. "So controlling something preventatively beforehand ends up costing almost nothing compared to being shut down because there is one egg on the underside of a single leaf in my orchard."

Broz isn't the only one calling into question the government's plan to eradicate the LBAM rather than simply control it. Over the past six months, well-respected entomologists and horticulturalists have expressed increasing skepticism at the scientific basis of the government's eradication plan. The California Department of Food and Agriculture (CDFA) and the USDA are currently planning to aerially spray biochemical pheromones on five California counties beginning Aug. 1. Four other counties, including Marin, would force ag professionals to establish the twist-tie pheromones that Broz employs. An isolated infestation of the LBAM was found and eradicated in Napa last year, and one LBAM was found in Sonoma County in February; should another turn up, Sonoma will be added to the spray list.

In the course of the debate, wider questions about how to confront invasive pests in an interconnected world have also surfaced.


Behind the Curtain

In May 2007, Dr. Marshall Johnson wiped the sweat from his brow as the sun beat down on the pavement in front of San Jose's Wyndham Hotel. Making his way through the lobby, Johnson headed straight for the conference room where a group of scientists were already furiously skimming through reams of biological information on the light brown apple moth.

The 10 assembled entomology experts, at least half of whom were on the USDA's payroll, felt a heavy weight on their shoulders. They had been hastily called together, given the label Technical Working Group (TWG) and tasked with determining whether or not the federal government should declare total war on the LBAM and begin a multistage process of wiping it out. If they decided it was too late and that the pest had become firmly established on the U.S. mainland, they would have to recommend the eradication fight be given up and management pursued instead.

A lot was at stake. The moth was spread across five counties, from Monterey to the Bay Area, but hadn't yet hit the Central Valley, the heart of California's agriculture industry. Farming groups and foreign trading partners were already clamoring for the Feds to wipe the pest off the face of the continent. The TWG scientists were presented with figures from Australia, where it costs over $21 million a year to control the pest.

With this mass of information swirling in their heads, the members of the TWG were allowed only three days to make their final recommendation. None of the scientists at the time could have guessed how much controversy their decision to pursue the goal of total eradication would generate, nor could they have predicted the much broader questions about invasive pest policy that would arise as public support for the fight against the pest deteriorated rapidly.


Moth Code Red

Anti-spraying activists have frequently targeted the CDFA as the agency responsible for the blanket spraying, but it was actually the USDA's Animal and Plant Health Inspection Service that originally sounded the alarm and convened the TWG when it heard the apple moth had been found in California. The Feds wanted action fast. They had on their desks a report produced in 2003 by University of Minnesota entomologists suggesting the moth could infest up to 80 percent of the continental United States. This made the LBAM infestation an extreme threat in their minds, both to the native environment and to the nation's economic interests.

The pressure was on the CDFA to act swiftly. If the state lagged behind, the USDA reserved the right to quarantine all of California, according to a University of California integrated pest management report. It was under these tense circumstances that Johnson, an award-winning veteran entomologist from UC Riverside, was called to San Jose to talk LBAM. He remembers the three-day conference like it was yesterday.

"When we first went into the group, the assumption was that there would probably be eradication because it was a new pest," he says. "It wasn't a big argument or anything like that; it was a discussion of what we know, what we don't know and what the probability was that this could be accomplished. It was a very short discussion." However short, this discussion yielded four compelling reasons for eradication, according to Johnson. First was the issue of economic impact.

The USDA predicts crop damage that could cost growers anywhere from $160 million to $640 million annually, and that's just for the counties already infested. If the LBAM spreads to other states, the USDA predicts that the cost of crop damage could reach the billions.

But that isn't the whole story. There was also a great deal of fear that the pest could shut down California's ability to ship agricultural goods out of the country. It's an ironic series of events: For reasons that aren't clear, the LBAM was classified as a "Class A" pest by the CDFA in 1996 (it is not clear whether the USDA listed the pest on its watch list as well, but the Feds were nervous enough to order up a report on it in 2003).

Under this CDFA designation, which is the highest possible under state law, shipments of agricultural commodities from New Zealand and Australia had to be inspected thoroughly for the pest before being allowed access to California ports. This meant growers in New Zealand and Australia had to spend extra money and time proving their products were LBAM-free in order to ship their agricultural commodities to California.

When the pest was discovered on the U.S. mainland, the A-rating came back to haunt the CDFA and shake the nerves of USDA officials. Canada and Mexico began requiring thorough inspections of all produce for the LBAM before it was shipped across their borders, and at least seven states were calling for advanced warning whenever shipments from the infested counties were heading their way. Although the LBAM hadn't damaged any crops yet, it was evident the moth was going to end up costing growers across the state millions in lost sales and control efforts. This costly reality was on the minds of all TWG members, Johnson says.

"The driving factor is the possibility of other countries shutting off our exports to them," he explains. "If you went from eradication to management, you would have to be at zero tolerance for export." As for local growers selling their products within an infested county, Johnson predicts they would only use pesticides and other control methods if the cost could be passed on to the consumer, meaning either higher fruit prices at the market or large losses for growers who would have to throw away damaged products.

This would be an expensive long-term proposition for growers, and, to make matters worse, it wouldn't be concentrated in a single agricultural industry. The pest can infest up to 250 different plants, including most fruit trees and decorative plants sold in nurseries. There are also reports that the LBAM has the ability to incorporate new plants into its diet over time, meaning it could potentially threaten all of California's agriculture fields, and possibly over 75 percent of fields in the United States. Mysteriously, no crop damage has been reported. Nevertheless, the TWG chose caution.

"Since the light brown apple moth already has a broad range of plants it eats, it makes it a lot easier to adapt to new plant species," Johnson reasons. "The main ecological ramification would be its ability to invade new areas in California or the United States, and once it started to take off in places like the San Joaquin Valley, where you have peaches, olives and nectarines, you might have to start spraying [toxic] stuff for it."

Regardless of how far the moth has spread thus far, Johnson and others worry that if management were pursued instead of eradication, individual growers would eventually decide to defend their crops with toxic pesticides. That could cause a huge problem, says Johnson. Not only does the LBAM adapt to new plant hosts as it spreads across the world, it has also shown the ability to evolve pesticide resistance. This was observed most notably during its infestation of New Zealand, says Johnson.

"If you get a lot of people who start spraying for it, and then it develops resistance, people will have to start spraying more toxic pesticides more frequently. You don't know what the ramifications are for the management system of other pests."

Not to mention the impact on the state's water supply and any animals or humans exposed to the toxins. With the severity of these four key threats in mind—export restrictions, the pest's adaptability, the potential spraying of toxic pesticides by individual growers and a fear that the pest could develop pesticide resistance—the TWG concluded eradication must be pursued swiftly.

In short order, a plan was established: an emergency environmental review exemption was granted by the EPA for use of the Checkmate-LBAM pheromone, a substance that releases the female moth scent over a large area and thus hinders the male moth's ability to find a real female mate; federal and state quarantines were established in all infested counties; and nurseries were forced to spray the organophosphate chlorpyrifos on all their products if even a single moth adult or larvae was found. The Feds were ready to fight.


The Other Shoe Drops

In September, fewer than five months after the TWG had made its recommendation, three planes were dispatched to release pheromones over Monterey County. In November they sprayed Santa Cruz County. Immediately, a chorus of environmental and public-health groups decried the blanket spraying of pheromones over houses, schools and places of business. Newspaper articles reporting on the CDFA's handling of the pest poured forth, as did lawsuits attempting to stop the spraying.

Amid this troubling backdrop, respected entomologists and others began to question whether or not the state's eradication goal was really possible. Dr. James Carey, a UC Davis entomologist who has been researching the field of pest management for over 20 years, believes it is nothing short of wishful thinking to suppose a pest that has now infested at least nine counties can be eradicated.

"It's not that I don't favor eradication; I'd like to get rid of it if we could do it easily. That's not the question. It's a matter of what I see being a program that's been launched that has no chance of success," Carey says. "I seriously doubt that they've really delineated the population. There are literally tens of thousands, if not hundreds of thousands, of populations of LBAM, so anything less than 100 percent elimination of every one of these tens of thousands of individual populations is control and not eradication."

Carey knows whereof he speaks. He provided research that has helped the CDFA keep the Mediterranean fruit fly under control (the Medfly has successfully resisted eradication all along) and has published well over 50 essays on pest management. According to his experience, a perfect mix of biological and political factors needs to be in place before a pest can realistically be eradicated. He doesn't think these preconditions exist with the LBAM.

"You need an effective tool. We don't have it here," says Carey. "You need public support. It's not clear that we have that here. You need a detection tool that is effective even in the advanced stages of eradication so you can identify pockets, but also in the early stages so you can delineate a population. Lastly, you need long-term funding. You can't have a program set in motion, and then at the whims of an administration have the program pulled."

According to Johnson, the TWG had recommended to the CDFA back in May that it evaluate different crops the moth might eat to see which ones would be most severely impacted by LBAM feeding. Johnson said he hasn't heard of that process going forward, and Steve Lyle from the CDFA said he couldn't track down any information on these efforts.


Threat Overblown?

Another voice joined the call for management on March 7, when UC Santa Cruz Arboretum director Dan Harder released a report on his research trip to New Zealand. He had toured the northern part of the country, which he claims has a similar climate to the Central California coast, and found that controlling the pest could be cheap, easy and effective.

The trick, according to the 11 sources he cites in his report, is to hit the moth colonies with a one-two punch: First, release the natural predators. According to Harder's retelling of an interview with a Dr. Peter Shaw of New Zealand HortResearch, about 80 percent to 90 percent of moth larvae are knocked off by these LBAM killers. They include a number of different wasps, flies and even the earwig.

As for the remaining 10 percent to 20 percent of LBAM larvae that survive, Harder cites HortResearch reports that recommend using "insect birth control," also known as insect growth regulators. These sprays don't kill the larvae, but instead prevent them from blossoming into adults, meaning they can never reproduce. New Zealanders adopted this two-pronged approach in 2001, after the use of organophosphates between the mid-'90s and 2001 killed off the moth's natural enemies, resulting in exploding LBAM populations.

Back on this side of the pond, Cavanaugh sees CDFA and USDA officials, who he is quick to laud as "doing the best they can given the circumstances," being forced to pursue eradication so they can appease trading partners, even as serious questions about the feasibility of eradication are left unanswered.

"It's like when the bubonic plague hit in Europe," Cavanaugh says. "People were going around burning down houses and burning people alive because they didn't know what they were dealing with. Once they found out it was carried by a flea, it was treated appropriately. It's the same thing here; they don't have the information ahead of time, so they're effectively experimenting."

It may be an experiment and maybe it won't work, but given what is at stake, eradication should be pursued anyhow. This is the thrust of retired UC Davis entomology professor Dick Rice's argument. Eradication is never easy, Rice says, but if we just "throw up our hands" and admit defeat before the fight has even begun, there could be devastating consequences.

"Eradication in the coastal areas is going to be difficult, because over the winter and early spring, before the CDFA and USDA start their pheromone program, this pest is going to be spreading into uncultivated areas, not just orchards and agriculture fields," Rice says. "But it's still something to attempt if they can afford to do it and show some success. My thinking is that if LBAM did become established . . . up into Oregon and Washington, it would increase expenses tremendously both in terms of ornamental industry and the tree-fruit industry."

Yet Cavanaugh and other critics of the eradication plan point again to the fact that there has been no recorded LBAM damage to California agriculture. "The basic question is, are we overreacting to exotic pests on pure speculation?" Cavanaugh asks.


Ticket to Ride

The eruption of controversy over the USDA and CDFA's eradication goal and the subsequent treatment plan may be just a hint of things to come. In an era of global trade, the opportunities for pests to catch a free ride across the ocean become so ubiquitous no government can realistically plug all the holes in their borders.

A report from the United Nations' Food and Agriculture Organization provides a glimpse into this stark reality. In just one year, from 2004 to 2005, worldwide food exports increased 8 percent. Between 2000 and 2005, the figure was 23 percent. There is little doubt this process will become much more pronounced as the worldwide population increases to more than 8 billion people by 2030 and trade balances between countries continue to deepen.

It's not just agricultural goods either. Wood packaging, foreign tourists and the ballast water of ships can all easily spread invasive species. As long as consumer goods are produced in China, coffee is shipped to United States ports from South America and summer vacations are spent in the tropics, pests will be transported to and fro.

For many environmentalists, this is less an economic issue than an environmental one. As fragile ecosystems suffer under the weight of human activity and climate change, an invasion by pests with no natural enemies in the area can mean extinction for many native species. Dr. John Randall, who works at UC Davis and runs the Nature Conservancy's Invasive Species Team, believes this is a huge threat to biodiversity that must be combated first with prevention, but then with swift eradication plans when dangerous new pests are discovered.

"These pests change the character of our natural environments. It's one more threat to an already beleaguered and limited area of wild vegetation and native species," says Randall, who is unfamiliar with the specific situation of the LBAM. "If you're able to identify, contain and eradicate a pest early, the number of pests in the area you have to treat is small and the costs are far smaller. It has been shown over and over again that the state and society spends far less with that kind of approach.

"So perhaps rushing forward with eradication plans even as comprehensive biological research lags behind is wise both for the nation's food supply and environmental health."

Not so, argues Carey. "CDFA and USDA right now just basically draw a bull's-eye and say, 'Kill!' It's not sophisticated at all," says Carey. "The science needs to be coherent with the operational aspects. The agencies in academia need to work more closely on this. Right now—and I'm trying to change this—UC is really not involved at all, even though we're the research arm of the state. CDFA, industry and academia all need to be on the same page here."

Bartuska and Randall both echo this call for increased communication between researchers and policy makers. However, Randall believes this is only one of the many improvements that will need to be made as invasive species find almost daily opportunities to spread in an increasingly interdependent world.

"What we have now is not good enough nationally or internationally," says Randall. "The bad news is that funding was cut to the CDFA in 2000 and has still not completely been restored. This has hurt the state Department of Agriculture's ability to keep out pests."

How the world deals with the invasive pest threat is yet to be seen, but work has already started on finding solutions, both within government and among conservation groups. Whether or not these solutions will be enough to overcome the formidable challenges invasive pests will pose this next century is an open question, even for experts such as Rice.

"We're going to continue to see more of these invasive species come in, and we've known this for years." says Rice. "This will be particularly true as we get into more of these trade agreements with other countries and the ability to ship things without really high levels of inspection and certification becomes commonplace. It's going to get much more difficult. I see a lot more of this stuff coming down the road."


Curing the Cure

Environmental and public-health activists have been beating down the doors of Bay Area legislators in Sacramento for the past three months, demanding they stand up to the CDFA as the agency powers forward with plans to aerially spray four counties with a synthetic pheromone to battle the LBAM. The legislators have apparently been listening.

On Friday, Feb. 22, a set of four bills related to the CDFA's handling of the infestation surfaced in the State Assembly. Written by San Francisco assemblyman Mark Leno, AB 2760 would halt the aerial spraying, currently slated to begin on June 1, until the CDFA has drafted an environmental impact report. The EIR is still in the early stages; it would likely take well past June to be finalized. Under state law, an EIR is normally required before spraying pesticides, but an emergency exception was granted by the EPA last year.

Marin County assemblyman Jared Huffman wants to force pesticide manufacturers to release information on all the ingredients contained in their products before they're used by any state agency, emergency or no. His bill, AB 2765 comes in the wake of pheromone manufacturer Suterra LLC's refusal to disclose the ingredients in Checkmate-LBAM-F, citing its right to protect the information from potential competitors.

Rounding out the challenges to the emergency declaration issue, AB 2764, introduced by East Bay assemblywoman Loni Hancock, would make the governor the only public official who could proclaim a state of emergency requiring the spraying of pesticides over urban areas.

While these three bills respond to the loud accusations that the CDFA has ignored public concerns and plowed ahead with an eradication plan that puts human health at risk, at least one lawmaker is focusing on the overlooked issue of invasive pest planning.


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