Dicamba Update: Are Hoods the Answer to Drift?

If Steve Claussen had it his way, U.S. EPA would amend the dicamba label today to allow for spraying in higher wind speeds than the 3-to-10 mph range currently permitted – so long as a spray hood is used.

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Dicamba Update: Are Hoods the Answer to Drift?

Redball SPK645 self-propelled broadcast retrofit hood kit in an Illinois soybean field. Photo courtesy of Steve Claussen

A hood, you say? “We try to keep chemical where it’s intended to be sprayed, in a simple and inexpensive way that just about anybody can understand. If you put a spray tip in an enclosure and spray, you’re eliminating wind and other things that can happen from Mother Nature,” says Claussen, Founder and President of Willmar Fabrication, maker of Redball sprayer hoods.

Down in southern cotton fields, they’re a common sight, but up North, spray hoods remain somewhat of a mystery to many growers.

Hoods take only about 10 minutes to put on and off, he says – but time is money. More to the point, there is no legal way in which to use hoods to see the clear benefits of reduced drift and improved deposition, as an applicator still has to abide by buffers and can’t spray if winds are stronger than 10 mph. In Canada and Europe, Claussen points out, credit is given to applicators that use hoods or shields in the way of a 70% to 100% reduction in buffers depending on the chemistry.

Claussen grew up on a Minnesota farm, not far from where he and his brother invented the Redball Monitor in 1983 for monitoring fertilizer. Soon after, they developed the Redball spray hood for pre-Roundup Ready cotton growers to fight weeds between rows. “Everybody in the South knows about Redball hoods, but up North, we never had the need or awareness, or any company to help us push it.”

Ahead of the release of dicamba-resistant technologies, Claussen sensed opportunity, knowing what he did about the molecule’s propensity to drift. He redesigned the company’s original hood with a goal of 100% drift reduction.

“I wanted to get where we could control all drift with the hood in all conditions. I’m not saying it does that, but it does it much more effectively than anything else on the market, from a consistency, day-in-and-day-out point of view,” he says.

In 2013, he took the hoods to Dr. Greg Kruger at University of Nebraska and Dr. Dan Reynolds at Mississippi State University, who undertook three years of studies using glyphosate, which yielded two papers, one published in 2014 and the other in 2018. The studies demonstrated that hooded sprayers “considerably reduced drift of all tested spray qualities at short distances downwind, including up to 86% less with a Fine spray quality. Additionally, at longer distances up to 300 feet downwind, both larger spray qualities and sprayer hoods reduced drift independently.”

He took the data to EPA, but that’s not all. He also dragged a sprayer boom, complete with hoods, along with him on the road to Maryland, just outside of D.C., to show the agency its powers up close and in person. “Fifteen EPA staff and managers came and we got their attention for four hours.”

EPA encouraged him to seek out the support of the dicamba or other pesticide registrants, at least one of which would need to make the request to change the label to allow applications with reduced buffers or higher wind speeds.

“We’re still trying to find the registrant or someone that wants to team up and jointly promote what the hoods can do, just like we did in the South” Claussen says. “Right now, it’s awareness as much as anything. With the awareness will come label changes, just like in Canada and Europe. It’s just a matter of where and when.”

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Avatar for MARK LEDEBUHR MARK LEDEBUHR says:

American ingenuity can solve any problem, but can we create a regulatory system that will let it? Hoods work, period. The literature shows 95%+ reduction in drift in some cases. Science has known this for many decades. So why don’t we use them more? This article illustrates a fatal problem in our pesticide application regulatory system: the inability to consider hardware improvements as a variable in the spray application process, INDEPENDENT of the label. With 2500+ registered products and numerous non-nozzle hardware innovations including hoods that are capable of improving spray placement, it would be impossible for every hardware manufacturer to court every registrant on a product-by product basis, even if the registrants were receptive to increasing the complexity of their labels. There simply isn’t enough money in the world to work within the current process. With over 330 million Americans, all of whom are stakeholders in this issue, for the price of a couple of soft drinks per person and some intestinal fortitude, this problem could be solved. The EPA DRT program hasn’t delivered as was originally envisioned, but that doesn’t mean we shouldn’t keep working to improve it. We have to do better!

Avatar for Jim Ruen Jim Ruen says:

Electrostatic sprayers work even better, but farmers saw no reason to adopt them. Coverage was so superior that those who did were able to reduce the application rate significantly, however, this took them “off-label”. No chemical company was interested in revising their label to match as that would have required additional testing and in the end reduced product sales. Thus, there was not enough financial incentive for row crop producers to adopt the technology. Until there is a dollar value placed on reducing drift, i.e. severe penalties for drift related crop damage, adoption of new technologies or proven ones such as hoods, are unlikely. That is especially true in the current economic scenario.

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