Sterile Soil, Dirty Hands (Speaking of sterilizing soils)

[Guest guest]

Sterile Soil, Dirty Hands

An EPA-approved pesticide is worse than the one it's replacing

 

By Tom Philpott

Grist Magazine, Dec 6, 2007

 

"The soil is, as a matter of fact, full of live

organisms. It is essential to conceive of it as something pulsating

with life, not as a dead or inert mass."

-- Albert Howard, The Soil and Health, 1947

 

In October, the U.S. Environmental Protection Agency granted

temporary approval for use of methyl iodide, a highly toxic fumigant

favored by large-scale strawberry and other fruit growers to sterilize

soil ahead of planting.

 

The move generated outrage among scientists, though it didn't get much play in a news cycle dominated by the presidential election and high oil prices.

 

About a year before the unfortunate decision -- one of the most

disputed in the EPA's history -- EPA director Stephen Johnson appointed

a woman named Elin Miller to a high post within the agency. Before

swinging through the revolving door to work as a regulator, Miller

worked as CEO of the North American arm of Arysta, the Japan-based

chemical giant that markets methyl iodide under the brand name Midas.

Before that,

Miller worked at Dow Chemical, "overseeing the company's public

affairs, global pest management, and Asia Pacific operations," an EPA press release states, without an ounce of shame.

 

Coincidentally or not, weeks after the EPA gave methyl iodide the thumbs up, Arysta got snapped up by a European buyout firm for a cool $2.2 billion. Talk about the Midas touch.

 

In this age of Halliburton and Blackwater, none of this counts as

remarkable or generates much discussion. Like a toxic fumigant,

unchecked crony capitalism spreads a cynical haze over the political

landscape. If we're powerless to stop the slow-motion calamity in Iraq,

what can we do for a bunch of migrant farmworkers?

 

Yet each bite we take ties us to the people who grow our food. The methyl iodide situation deserves more thought.

 

Dirty Deeds

 

For most of agriculture's 10,000-year history, farmers have succeeded or failed based on their ability to nurture life within

 

In modern agriculture, however, soil operates as a medium, not a

habitat: It exists to transfer synthetic, pre-metabolized nutrients

from factories to crops. In this regime, any life form found in soil is

at best innocuous -- and at worst a threat. When a vast field is

planted in the same crop year after year, its pests concentrate in the

soil, waiting to strike.

 

No longer an ally to farmers, life in the soil becomes a problem in

need of solution. Rather than nurture it, the farmer's task becomes to

eradicate it.

 

That's where the nation's industrial strawberry farmers -- as well as

Florida's large-scale tomato growers -- find themselves. They literally

fear their soil, fretting that it harbors microscopic roundworms called

nematodes that feed on the roots and leaves of plants, endangering the harvest.

 

For decades, the preferred answer for large-scale fruit growers has

been to literally sterilize soil with methyl bromide, a highly toxic

fumigant sprayed onto soil before planting. Methyl bromide kills

everything it contacts, turning the soil into an inert medium.

 

But sterilizing dirt turns out to be a dirty business: methyl bromide's

death-dealing powers aren't limited to microorganisms. It has proved

extremely toxic to humans and is one of the globe's most powerful

ozone-depleting substances.

 

Way back in 1987, the United States agreed to phase out methyl bromide

by 2005, under the Montreal Protocol -- a pact largely credited with

saving the ozone layer. Since then, evidence of gruesome harm to farmworkers and their offspring caused by methyl bromide has piled up.

 

And yet, U.S. farmers still spray millions of pounds of methyl bromide onto fields each year, under exceptions to the Montreal Protocol strenuously negotiated

by the Bush administration. In 2006 -- the year after the Montreal ban

was supposed to become complete -- California strawberry farmers

actually increased

their methyl bromide use by 5 percent, applying it to an additional

2,200 acres. At a recent meeting of Montreal pact signees, Bush secured

approval for U.S. farmers to use 11.8 million pounds in 2008 -- more

than a third of the pre-treaty level.

 

The compound attacks the central nervous system, and damages the lungs

and kidneys. It has been linked to reproductive disorders, including

birth defects. Since farm fields directly abut subdivisions in

California's agriculture-heavy counties, its use imperils not only

farmworkers but also nearby residents. Clean Water Action of California

cites

395 cases of methyl bromide poisoning between 1999 and 2004, the years

when the phaseout should have been entering its final stage. And that

number may be wildly low, since most migrant farmworkers, particularly

undocumented ones, have at best limited access to medical care.

 

Bad Seeds

 

The U.S. government's official opinion on methyl bromide has been: we

can't fully ban it until we find a suitable alternative. Yet methyl

iodide, hailed as the answer, might be yet more toxic.

 

Just before approving methyl iodide in October, the EPA received a blunt letter

[PDF] signed by 54 prominent scientists, including the Nobel chemist

Roald Hoffman, laying out the case against the compound. "Alkylating

agents like methyl iodide are extraordinarily well-known cancer hazards

in the chemical community because of their ability to modify the

chemist's own DNA," the scientists warned.

 

Susan Kegley, senior staff scientist for the Pesticide Action Network

of North America, told me that methyl iodide is so carcinogenic that

scientists have used it for years to induce cancer in lab tissue.

 

Do we really need to subject farmworkers as well as people who live

near farm fields to this stuff, in order to secure a steady supply of

industrial -- and flavorless -- tomatoes and strawberries?

 

To perform the bit of mental gymnastics that makes sterilizing soil

with highly toxic substances seem not only necessary but desirable, you

have to see agriculture as an industrial process whose main goal is

maximum yield.

 

But the PANNA website lists all sorts of low-tech solutions

to the nematode problem, including good old-fashioned crop rotation.

And Kegley also recommends a return to old seed varieties that

developed before this era of sterilized soils.

 

"The 'giant red' -- but tasteless -- strawberry variety that's popular

now doesn't do very well in non-fumigated soil," she says. "But the

smaller, less perfect-shaped strawberries that organic farmers are

using now are very resistant to soil pests and fungi." As a bonus, she

adds, such strawberries actually taste good. "That's the direction

we're going to have to move in if we want to get beyond fumigants."

 

Indeed, back when farmers grew strawberries that could fend for

themselves, the chemical companies had to scramble to get them to

accept fumigants in the first place. Farmers had no idea that nematodes

existed, much less that they might be reducing yields. Methyl bromide

originated as a byproduct of the process for making leaded gasoline in

the 1940s, and the petrochemical industry strained mightily to sell it

to farmers. This firsthand account

by a man who worked as a sales rep for Shell Oil at the time documents

the elaborate machinations he went through to demonstrate the benefits

of fumigation.

 

Even then, the government pitched in. The man credits "the generous

help of [the USDA] Extension Service" with helping him convince farmers

to sterilize their fields.

 

Of course, in the decades since, hybridized seed varieties have been developed that literally need

sterile soil: and thus sacrifice farmworkers' health to bring us

tasteless strawberries. It's the mind-set that got us to this point,

not microorganisms in the dirt, that needs to be attacked. soil. The

microorganisms and earthworms that thrive in healthy soil metabolize

nutrients and make them available for crops. They also convert animal

and vegetable waste into humus, thus regenerating their own habitat and

maintaining that thin layer of topsoil on which all terrestrial life

depends.