THIRD WORLD NETWORK BIOSAFETY INFORMATION SERVICE
Dear Friends and Colleagues
Widespread Damage from Dicamba Drives a Deep Wedge Between Farmers
Dicamba was first registered in the U.S. in 1967. Known to be volatile, becoming vapor at high temperatures, it was typically only used to clear fields of weeds before planting in late fall or early winter—at times when it would do little damage to nearby plants and didn’t impact growing crops. New formulations, introduced by Monsanto (now Bayer), Dupont and BASF in 2016 and 2017, claimed to lower dicamba’s volatility, and therefore its drift potential, in warm spring and summer weather. Dicamba use has increased in conjunction with crops genetically engineered to be resistant to it, such as soya and cotton. However, farmers and even homeowners have reported serious damage to vegetables especially tomatoes, trees, gardens, shrubs and lawns.
The issue has divided farming communities and set neighbour against neighbour. Pro-dicamba farmers argue it is the only thing that can fight herbicide-resistant “superweeds,” such as waterhemp and marestail. But because dicamba mimics plant hormones called auxins, it is also toxic to a wide variety of broadleaf and woody plants. While specialty crops like fruit and vegetables have no defense against pesticide drift, the risk of damage has motivated soybean farmers to adopt dicamba-resistant soybeans to avoid their own losses.
Until now, farmers have explored a range of options—some have settled disputes themselves, others have sued Bayer, and many have filed insurance claims. One dispute ended in deathand an unknown number have resulted in bitter relations. In sparsely populated areas, where neighbors have often relied heavily on one another in the past, these dynamics can have large ramifications on daily life. A chasm has opened up that is hard to repair.
Despite these escalating tensions, planting of Bayer’s genetically engineered Xtend dicamba-resistant soybeans doubled in acreage, to 50 million acres, in 2018. The situation only promises to get more complicated now that the Environmental Protection Agency has reauthorized dicamba’s registration for two more years with additional restrictions, including requiring it be sprayed only by certified applicators up to 45 or 60 days after planting on cotton and soybeans respectively, introducing buffers to protect endangered species and restricting application hours during the day. However, many pesticide and weed experts don’t think the EPA’s new directives will do much to get dicamba damage down to an acceptable level. The restrictions don’t prevent late-season spraying. In addition, research has shown that glyphosate can increase the volatility of dicamba, yet there are no new regulations that prevent mixing the two in pesticide spray tanks.
With best wishes,
By Virginia Gewin
ENVIRONMENT, Pesticides, Rural Environment and Agriculture Project
8 November 2018
John and Lisa Zuhlke used to get along well with their neighbor of 10 years. Before they began raising more than 350 varieties of heirloom vegetables and honey on their five-acre operation in Aurora, South Dakota, two years ago, they maintained an amicable relationship with the soybean grower next door. He would scoop snow from their driveway and road and let them hunt his land for dove geese, says John Zuhlke.
Dicamba—the controversial weed killer—upended their relationship.
In August 2017, the leaves on Zuhlke’s vegetable crops started looking deformed, curling up around the edges, or cupping. “It was weird to me. I’d never seen anything like it,” he says. When he asked his neighbor about it, he was told the neighbor had sprayed Engenia, one of three “low volatility” dicamba products that have been approved to spray on fields of dicamba-resistant soybeans after the seedlings have emerged.
Zuhlke lost over $11,000 worth of crops that summer, and had to let over 300 tomato plants rot in the field. Offered no apology, he made a claim on his neighbor’s liability insurance. But the insurance company refused to pay, blaming the product. And while the neighboring farmer had been careful when spraying in the past, that has changed. “Now he hates us,” says a frustrated Zuhlke, who has reported pesticide damage to the state’s department of agriculture three times in two years.
This year, the leaves on Zuhlke’s black walnut and cherry trees even curled up. Lab resultshe posted on Twitter indicated a cocktail of pesticides: dicamba, glyphosate (the main ingredient in Roundup), and 2, 4-D. As far as he could tell, however, “no one within a half of a mile sprayed,” he says.
Dicamba was first registered in the U.S. in 1967. Known to be volatile, becoming vapor at high temperatures, it was typically only used to clear fields of weeds before planting in late fall or early winter—at times when it would do little damage to nearby plants and didn’t impact growing crops. The new formulations, introduced by Monsanto (now Bayer), Dupont, and BASF in 2016 and 2017, claimed to lower dicamba’s volatility, and therefore its drift potential, in warm spring and summer weather. But the herbicides have proved so problematic for neighboring farms that both Arkansas and Missouri placed temporary banson them in 2017.
Independent researchers were not allowed to testthe products’ volatility before they were registered, and many are still struggling to get a clear picture of how it moves and under which conditions it volatilizes. Many pesticide experts shared a common a sense of dread when dicamba was first registered for use on soybeans and cotton—but the ensuing damage exceeded their fears. “Even the most pessimistic pesticide specialist was shocked by the amount of off-target movement and damage in 2017,” says Andrew Thostenson, a pesticide specialist at North Dakota State University Extension Service in Fargo.
On Halloween evening, the U.S. Environmental Protection Agency (EPA) released a long-awaited decision reauthorizing dicamba’s registrationfor two more years, with additional restrictions to the already-complicated label. And while some of those restrictions may help some farmers avoid harming their neighbors’ crops, it will likely continue to sour more rural relationships in the years ahead.
Data is Elusive
Detailed data on the number of dicamba damage complaints and acres impacted are hard to find. For example, Arkansas refused to share data on dicamba damage with non-state residents. Farmers can either call the company or the state’s department of agriculture to lodge complaints. Monsanto says they had received 381 calls about damage by end of last summer. As of July 15, University of Missouri weed scientist Kevin Bradley had tallied roughly 600 cases of damage on the 1.1 million acresthat were under investigation by state departments of agriculture. Yet after several states—including Oklahoma, Iowa, Tennessee, and Kentucky—opted not to share data, he discontinued the record-keeping.
The American Association of Pesticide Control Officials (AAPCO) routinely sent surveysto state departments of agriculture around the nation, but it received similarly spotty data in return. Most of these folks are overwhelmed by the workload and exhausted after the past few years of damage, says AAPCO president Tony Cofer, based at the Alabama Department of Agriculture & Industries.
According to the September 6, 2018 AAPCO survey, Zuhlke’s home state of South Dakota had documented 46 reported cases of dicamba damage on 45,000 acres. Zuhlke, like many, believes the reported numbers are an underestimate. “Nobody wants to piss off their neighbors,” he says.
But impacted neighbors throughout soybean and cotton country are, in a word, pissed. “I have never seen an issue that has divided agriculture, as a whole, like this issue has,” says Jason Norsworthy, a weed scientist at the University of Arkansas. North Dakota State’s Thostenson agrees. In fact, he says he was physically threatened on social media for expressing his views as a university pesticide specialist. “I couldn’t have imagined some of the things that have been done and said to me,” says Thostenson. “It’s jarring. It’s scary,” he says.
Yet, despite these escalating tensions, planting of Bayer’s Xtend dicamba-resistant soybeans doubled in acreage, to 50 million acres, in 2018. It’s a no-win situation for the EPA, says Bob Hartzler, a weed scientist at Iowa State University. “Half the agricultural communities say something has to change, and the other half says the technology’s problems are manageable.”
Pro-dicamba farmers argue it is the only thing that can fight herbicide-resistant “superweeds,” such as waterhemp, Palmer amaranth, and marestail. But because dicamba, like 2,4-D, mimics plant hormones called auxins, it is also toxic to a wide variety of broadleaf and woody plants. “If all the damage was on soybeans, agriculture could work that out,” says Hartzler. “But other plants in the landscape are not as easily replaced as a field of soybeans. That’s my big concern.” Vineyards in South Dakota, peach and apple orchards in Illinois, and over 500 acres of residential trees in Missouri are among the losses.
While specialty crops like fruit and vegetables have no defense against pesticide drift, the risk of damage has motivated soybean farmers to adopt dicamba-resistant soybeans to avoid their own losses. Nebraska soybean farmer Shane Graekel lost 140 acres of Roundup Ready soybeans to dicamba damage, for instance. Now he is simultaneously in the middle of lawsuit to recoup damages and planting more dicamba-resistant soybeans. “I like dicamba-resistant soybeans because the yields are so good, but people are making the switch to dicamba also as an insurance policy,” he says. “I’m switching to them because I don’t want the headache.”
The situation only promises to get more complicated now that the agency has reauthorized dicamba’s registration for two more years with additional restrictions, including requiring it be sprayed only by certified applicators up to 45 or 60 days after planting on cotton and soybeans respectively, introducing buffers to protect endangered species, and restricting application hours during the day. The decision also requires that Bayer conduct more research on off-site movement of dicamba during the 2019 growing season—or the company could lose the registration all together.
University of Arkansas’ Norsworthy is one of many pesticide and weed experts who don’t think the EPA’s new directives will do much to get dicamba damage down to an acceptable level. The restrictions don’t prevent late-season spraying, for one. In addition, Norsworthy’s own research showed that glyphosate can increase the volatility of dicamba, yet there are no new regulations that prevent mixing the two in pesticide spray tanks.
“If we are going to have to have weed control tools in the marketplace, [they] must coexist,” says Norsworthy, emphasizing that multiple tools are necessary to prevent weeds from developing resistance. “If they cannot coexist, we’re driving toward monoculture of a particular weed control system, and history has shown repeatedly that is a system that will fail.”
In a nutshell, the changes haven’t addressed the underlying problem: Dicamba is a potent toxin, prone to volatility and off-target movement, especially in warmer weather. “EPA is asking the right questions and demanding the appropriate answers needed to continue the registration,” says Thostenson. But the problems will not go away in 2019. “Until we address the issue of volatility, dicamba damage will not get down to an acceptable level.”
As a result, 2019 is set to be contentious year. “I think the farm community may be a lot less patient moving forward,” says Thostenson. “Those farmers injured in 2019 will not be very quiet about it,” he predicts. States may impose their own restrictions on the weed killer. On November 5, the Arkansas State Plant Board tentatively approved a June 15 cutoff dateto spray dicamba to further avoid off-target damage.
Until now, farmers explored a range of options—some have settled disputes themselves, others have sued Bayer, and many have filed insurance claims. One dispute ended in deathand an unknown number have resulted in bitter relations. In sparsely populated areas, where neighbors have often relied heavily on one another in the past, those dynamics can have outsized ramifications on daily life.
A chasm has opened up that is hard to repair. As is the case with many current, contentious issues, farmers are often either for or against dicamba, with little middle ground, says Aaron Hager, a weed scientist at the University of Illinois. “A farmer anywhere has the right to grow whatever they want,” he says, and “shouldn’t have to change his practices based on what his neighbor does.” What happens, he asks, if the tables are turned?
Louis Nelms filed complaints to the Illinois State Department of Agriculture in 2017 and 2018 when first his trees and then his garden plants were damaged by dicamba. Nelms had restored six of his 13 acres in central Illinois to native prairie. Before he retired, he had a native plant seed business, supplying seed for restoration projects around the Midwest. He also filed reports of herbicide injury to several natural preserves to the Illinois Department of Nature Resources.
“I wasn’t interested in getting anyone in trouble, but I really feel like every incident needs to be recorded so there’s a record of what’s going on,” says Nelms. And since the state didn’t offer to do testing, he paid $200 out of pocket to a private lab to confirm the results.
When his neighbor came by over three months later to discuss the issue, he was concerned about Nelms’ economic damage. “How do you put a dollar amount on my home vegetable garden or trees?” he thought. “I explained to him that it wasn’t anything personal but that I’ve got a right against toxic trespass on my property,” he recalls. Nelms’ concern is that dicamba was unleashed without adequate testing. “[The EPA] didn’t put any mechanism in place for systemic monitoring of what impact this is having out in the country,” he says. “They left it up to a voluntary, ad hoc system, organized by weed scientists, to gather estimates.”
Still, he wasn’t surprised when the EPA renewed dicamba’s registration last month. “Farmers are getting in pretty poor financial shape with net incomes at a 15 year-low,” he says. Ironically, he believes that the high-yielding, dicamba-resistant varieties have led to crop surpluses and low commodity prices. “I think there’d be a tremendous uproar among farmers if they didn’t renew the registration.”
But he says he’s not sure he wants to live in Illinois anymore. “It’s become a quality of life issue. Industrial agriculture has degraded natural ecosystems in the Midwest—with alarming effects on insects and pollinators. It’s made a lot of us wonder what the hell are we’re doing living here,” he says.
As dicamba use increases, so does the likelihood of non-farmers reporting damage. The number of homeowners and individuals reporting damage to gardens, trees, shrubs, and lawns, definitely increased in 2018 compared to 2017, says Norsworthy. “As individuals become more educated about the symptoms, they are more likely to pick up the phone [and report it],” he adds.
One long-term concern, notes Norsworthy, is how dicamba damage may impact the ability to develop and breed new soybean genetics. “It becomes challenging, if not impossible in environments in which non-dicamba soybeans have symptoms of damage,” he says.
However, many pesticide specialists fear that the worst long-term impact will be to agriculture’s reputation. “Agriculture in general is facing unprecedented scrutiny about all applications and having a ‘bad actor’ out there like dicamba is going to do nothing but inflame public sentiment … when the consuming public and rural residents start to realize and understand why trees and landscapes are being injured,” Steve Smith wrote in an emailed response to the EPA decision.
Smith, director of agriculture for Red Gold Tomatoes, a canned tomatoes company in Elwood, Indiana, provides the farmers he works with letters informing neighbors not to spray near their fields because the company will not tolerate economic losses. But, he says, neighbors who turn in dicamba damage complaints to the state risk the community turning on them. “The rural acrimony occurring is the real deal,” he says.
In the wake of the dicamba damage, South Dakota farmer John Zuhlke has cut by half the amount of produce he’s growing, because he can’t afford to invest time and labor into food that could be ruined. And that kind of decision, he says, has an impact on farmers’ reputations broadly. “Produce farmers are the face of farming to consumers and have close ties to the community. When was the last time you got served a bowl of soybeans in a restaurant?”
Yet his operation is the one being compromised. “The farmers that spray [dicamba] are putting that risk on me now,” says Zuhlke. And it’s hard to imagine that going well over the long term.
This story is part of a year-long series about the underreported agriculture stories in our rural communities.