Insects

Soybean Gall Midge Emerges As Top-Tier Threat

Mon, 11 May 2026 20:19:03 GMT

Soybean gall midge is no longer just a curiosity or annoyance for many Midwest farmers. The pest is chewing into yield and profitability for soybean growers across parts of at least seven states – Kansas, Iowa, Minnesota, Missouri, Nebraska, North Dakota, South Dakota.

Iowa State University Entomologist Erin Hodgson reports the pest’s footprint is significant, present in at least 42% of the 45.4 million acres of soybeans farmers harvested across the seven states in 2025.

“At least 19 million soybean acres are potentially impacted by this pest,” Hodgson says, noting that the pest continues to spread. Eight new counties were confirmed in 2025, with five of those being in Iowa .

According to a recent farmer survey led by University of Nebraska Entomologist Doug Golick, the pest has become a major threat in parts of Nebraska. “In the last year or two, soybean gall midge is approaching as near high of concern as herbicide-resistant weeds for survey respondents,” Golick says.

Since 2018, the soybean gall midge has spread to 185 total counties in seven states, including five new counties in Iowa this past year, according to Erin Hodgson, Iowa State University Extension entomologist and professor.

(Erin Hodgson)

Look For Small Orange Or White Larvae

Damage from the insect starts at the base of the soybean plants, largely out of sight. Adult midges emerge from the ground in May and June, then seek out tiny fissures in young soybean plants near the soil line to lay eggs, according to Thales Rodrigues da Silva, a master’s student at the University of Nebraska–Lincoln.

The larvae cause severe, localized yield losses from 20% to 100% loss along field edges and 17% to 50% reductions in entire fields average under heavy infestation, according to University of Nebraska-Lincoln (UNL) Extension. The larvae – small, orange worm-like pests – feed inside the base of the stem, causing plants to wither, die, and lodge (break), with damages sometimes extending 100+ feet into fields. Scouting for the pest should occur after the second trifoliate (V2) growth stage, according to the Crop Protection Network.

This damage in a soybean plant at the soil level shows the result of soybean gall midge larvae feeding.

(University of Nebraska-Lincoln Extension)

Because the pest often feeds along field edges, the damage in affected plants is often mistaken for issues caused by compaction or herbicide injury, according to Stine Seed Company .

To confirm the pest’s presence, Stine agronomists recommend digging up compromised soybean plants and splitting open the stem. If white or orange larvae are found feeding within the inner layers, growers should check the Soybean Gall Midge Alert Network tracking system to determine whether the pest has been reported in their area. Next, they should contact their local Extension specialist to help confirm the diagnosis and report the finding if their county is not yet documented in their area.

Cultural Practices Show Promise

Unfortunately, there are few strategies to manage and control soybean gall midge, according to Tony Lenz, Stine technical agronomist.
With no labeled, consistently effective in-season insecticide program and no established treatment threshold, researchers are testing cultural and mechanical tactics that might give farmers at least partial relief.

Tillage ahead of planting — a tough sell in no-till systems — shows some promise in reducing early infestations in current-year soybean fields.

“Turns out that disking alone, at least in (our) study… did reduce infestation,” says Justin McMechan an entomologist and associate professor at UNL.

“There’s a significant reduction as we move from no-till to that… where it’s just disked and planted into, and then disking and hilling (a practice used in growing potatoes), which really is effective, because you’re covering up the infestation site,” McMechan adds.

He notes that even subtle changes in seedbed shape may help by covering fissures or altering microclimates at the stem base.

On planters running row cleaners, McMechan says adjustments at field edges might be one of the more accessible tools.

“There are not huge differences, but they are statistically significant,” he adds.

Field edge management has been another area of experimentation, including mowing or managing dense vegetation next to infested fields. Results are mixed, but McMechan says there are situations where mowing modestly cuts pressure.

“Nebraska saw on occasion where mowing would reduce infestation and lead to marginal yield benefit… we’re talking like 6-bushel differences,” he says, adding that weather and nearby corn canopy can override those gains.

There are no insecticides currently available to control soybean gall midge. A combination of cultural practices and mechanical efforts is likely the best option, for now, to stop or slow the pest.

(Justin McMechan)

Scientists Evaluate ‘Out-Of-The-Box’ Practices

Other work by researchers is pushing even further outside the box to find control measures. At UNL, graduate research assistant Kristin Heinrichs Stark is testing whether a biodegradable surface barrier called BioWrap can physically trap larvae in the soil and prevent emergence.

The work is early-stage and raises reasonable questions about cost and field-scale application rates, but it points to the kind of layered, non-chemical tactics Extension researchers say will likely be needed to address the pest.

Even as these cultural and physical strategies are developed, Hodgson reminds farmers that the ag industry still lacks any clear control option once larvae are inside the soybean stem.

“We really don’t have a treatment threshold, or a rescue treatment option at this time,” she says. “We know that the soybean gall midge certainly can cause yield losses, plant death, and that directly relates to yield. But we don’t really have great answers on like, how many plants does it take? How many larvae per plant (causes yield loss)?”

For now, farmers dealing with soybean gall midge are being asked to combine careful field scouting, crop rotation, and targeted cultural tactics to address the pest as the research community races to find answers and close those gaps.

Specialists from three Midwest universities provided the latest updates on soybean gall midge (SGM) this spring in a webinar, available at the link below:

The 20-Bushel Wake-Up Call One Farmer Is Using To Boost Soybean Yields

Mon, 20 Apr 2026 16:42:15 GMT

For years, Stephen Butz watched his corn yields climb while his soybeans stalled. The numbers didn’t lie: corn was steadily improving, while soybeans were “average at best,” he recalls, running hot and cold from year to year with no clear pattern.

“Our soybeans were just plateauing,” says Butz, who farms near Kankakee, Ill.

The turning point for Butz came several years ago on a 120-acre field split between two soybean varieties — 80 acres on the north side and 40 acres on the south. Everything matched: planting date, field conditions, management. The only difference was the variety planted.

At harvest, the 40-acre section of the field was 18 to 19 bushels per acre better.

A talk with Butz’s seedsman revealed the answer: the higher-yielding soybeans carried the Peking source of resistance to soybean cyst nematode (SCN). That single difference explained nearly 20-bushels-per-acre the farm had been losing to SCN for years.

“Honestly, it was just one of those deals where our seed guy had said, ‘Hey, this is a good number.’ So we’d planted the variety kind of naively,” Butz says. “But lo and behold, it was a huge benefit for us and showed us a problem we had on this farm and other farms, too.”

With the initial finding of SCN, Butz started soil testing to identify how significant the problem was across his farm. Surprisingly, soil tests revealed SCN populations ranging from the low hundreds to as high as 5,000 per sample.

“We’ve got a good amount of farms in that 3,000 to 5,000 count, which is an extremely high amount that I need to address,” says Butz, who samples fields ahead of planting.

Spring 2026: Going 100% Peking

After splitting acres for several years between non-GMO and Enlist soybeans, Butz made a decisive shift to the latter for 2026 as the non-GMO soybeans do not carry resistance to SCN.

“This spring, we are going with 100% Peking,” he says

For Butz, the move is less about chasing bonus bushels of soybeans and more about stopping the hidden losses SCN has been causing. He’s certain he’s left a lot of yield potential on the table in previous seasons.

“We’re not so much adding bushels (with the Peking) as we expect to relieve the stress that’s been taking bushels away,” he says.

Going all-Peking this season is only part of his management plan. The other piece is rotating more between corn and soybeans and, over time, between different SCN technologies, including Peking and PI 88788.

Butz’s cropping pattern follows a rough structure of thirds in any given year: about a third of his total acres in corn or soybeans and another third in continuous corn. That same structure drives his soil sampling schedule and will, in the future, he says, guide how he rotates SCN resistance traits across the landscape.

He also hopes to bring new technology into the mix, including the new SCN solution on the way from BASF Agricultural Solutions, called Nemasphere. It is the first-ever biotech trait designed specifically to address SCN.

Unlike traditional native resistance found in PI 88788 and Peking, Nemasphere is based on a transgenic trait — a Cry14 protein engineered directly into the soybean — explains Hugo Borsari, BASF vice president of business management for seeds in North America.

Beyond Yield: Logistics And Longevity

For Butz, the case for more soybeans, and especially better-protected soybeans, isn’t just agronomic. It’s logistical and financial.
Soybeans help spread out workload during planting and harvest, he explains, easing the strain of managing continuous corn acres. They also inject rotation into fields that might otherwise lean too heavily to continuous corn.

“Years of continuous corn in some spots is fine, but rotation is obviously better,” he said during a recent panel discussion hosted by BASF.

Like he found out by accident, Butz says he believes many other growers might be losing significant yield to SCN without realizing it.

“You might live in an area that you raise 75-bushel beans all the time, or 80-bushel beans, and that’s amazing. But what if the potential is 90 or 100 bushels?“ Butz asks. “There’s plenty of people out there that might be losing 10, 15 bushels off the top, and that adds up fast. You’re freaking losing $100 an acre pretty quick that would help a lot with your bottom line.”

Are You Planting Second-Year Soybeans And Skipping Corn?

Fri, 20 Mar 2026 20:26:30 GMT

As input prices and markets fluctuate, many U.S. farmers are considering a shift from corn to soybeans this season. For some, like northwest Missouri farmer Todd Gibson, continuous soybeans aren’t just a one-year pivot—they are a long-term strategy to capture ROI on challenging soils.

Gibson, based near Norborne — a farming community that proudly bills itself as the “Soybean Capital of the World” — keeps a traditional corn-soybean rotation on his Missouri River bottom ground. But most of his fields with tougher, gumbo-type soils haven’t seen a corn planter in two decades.

“Growing corn on some of this heavy ground just doesn’t pay,” Gibson explains. “I’ve got some fields that have been in continuous soybeans for 20-plus years now.”

More Second-Year Soybeans In U.S. Farmers’ Plans

Gibson says he will grow more soybeans this season and on his better ground. “I’m going to cut my corn acres maybe in half. I’ll have more beans on the better dirt this year, mainly because of input prices,” he says.

Other U.S. farmers – many without Gibson’s experience – are looking to grow second-year soybeans. The Allendale Report released March 18 says private acreage estimates point to a shift toward more soybeans this season, notes Rich Nelson, chief analyst. He estimates U.S. corn planted area at 93.678 million acres, down about 5.1 million acres from 2025, while soybean acres are pegged at 85.659 million acres, up roughly 4.4 million acres over last year.

In southern Illinois, farmer and broker Sherman Newlin says the conversations he has with farmers these days are dominated by input costs and fertilizer availability concerns. While some tell him they’re sticking to their corn-bean rotations, others are considering a 100% shift to soybeans. Newlin is keeping his options open.

“I’m not planning on switching, but we’ll see,” he says. “We’ve still got a few weeks to go where we can swap out seed if we need to.”

Iowa Soybean Association Agronomist Lucas DeBruin says the farmers he works with in the state are sticking with their regular rotation and planting corn if that’s what the original plan was for this season.

“We use a lot of fall anhydrous here, so most guys are pretty locked into growing corn,” DeBruin says. “A lot of them also need the corn for livestock feed. Sometimes you can still squeeze a little bit more margin out of corn than the soybeans,” he adds, “and guys like growing corn more than soybeans. It’s more fun to pick corn.”

Look Before You Leap: The Ferrie Checklist

For farmers looking to change their seed order, Farm Journal Field Agronomist Ken Ferrie suggests taking a hard look at your balance sheet and your fields first. Here are some of his key recommendations:

Consider What You’ve Invested To Date: If you’ve already applied fall anhydrous or dry fertilizer for a corn crop, the “switch to beans” math doesn’t work. “You can’t afford to go to beans, because you’ve already spent the money,” Ferrie contends.

Account for the Yield Penalty: In a beans-after-beans scenario, Ferrie tells growers to expect a 5-to-7-bushel yield drag due to more stress from potential disease, insect and weed pressure. His question: “If you take 7 bushels off your bean yield, does it still cash flow against your corn APH?”

The Management “Claw Back": You can potentially mitigate some of the yield penalty in second-year soybeans by moving your planting date up from May to April, Ferrie says. Early planting helps the crop get an earlier and longer flowering period which can help recover some of the lost potential.

One morning this past week, Ferrie noted that the market was leaning back toward corn and that the see-saw between crops could continue this spring — another factor to keep in mind.

“Looking at the markets this morning, I think a lot of guys would prefer growing corn at $4.90 than beans at $11.10,” he contends.

The Continuous Soybean Playbook

For Gibson, success with continuous soybeans works based on a disciplined management system he relies on every year:

Fertility is Foundational. Even if you shift from corn to soybeans, Gibson says be aware that the beans could require more nutrients. He monitors his soil fertility closely, noting that continuous beans often require extra sulfur, phosphorus and potassium. He also keeps a close eye on micronutrients to ensure the crop won’t hit a hidden yield ceiling.

Non-Negotiable Seed Treatments: In continuous soybeans, the soil is more likely to become a reservoir for pathogens. Gibson hasn’t put a bare seed in the ground in 20 years. “Seed treatment guarantees me 100% replant,” he says. “It lets you sleep better at night knowing that if you get a heavy rain, you have that insurance to fall back on.”

Row Spacing and Canopy: Gibson plants in 15-inch rows at a rate of roughly 130,000 seeds per acre. The goals are quick emergence and a quick canopy. He believes a fast-closing row is your best defense against weeds and helps preserve soil moisture in the heavy gumbo. Seed treatment use and regular scouting help him feel confident in using narrow rows.

Keep Your Boots In The Field: In a corn-bean rotation, the “break” in the cycle helps farmers manage various diseases, insects and weeds. In continuous soybeans, you lose that advantage.

Gibson compensates by routine scouting and being prepared to address problems. “If you hear your neighbors have bug pressure, assume you will, too,” he says. “Don’t have the attitude that you can ‘get by,’ because you probably won’t.”

He has similar thoughts regarding weed pressure – “be proactive.” His program typically starts with a pre-emergence/burndown or early post application, with residual herbicides used to hold back weeds. If weeds break through, he is prepared to return with a post pass.

“We kind of wish sometimes we didn’t have to worry about weeds so much,” he says. “But if you don’t, then next thing you know, you think, ‘Oh, I wish we would have sprayed.’”

The Genetic Advantage: The final piece of the puzzle for Gibson is the advancement in soybean technology. He recalls the days when he says Williams 82 was his only real option for continuous soybeans. Today, advanced traits have made managing weeds and disease in continuous systems much more manageable, he notes.

On his continuous soybean acres, Gibson consistently sees yields average in the 50-to-60-bushel range. When he factors in the lower input costs compared to growing corn on heavy gumbo ground, he believes the decision to go with continuous soybeans is a good one. For Gibson, it’s not about following a trend— it’s about knowing what his land does best and having the management practices in place to succeed.

Making the Invisible Seen: How Artificial Intelligence is Unmasking Soybean Nematodes

Thu, 12 Mar 2026 18:20:15 GMT

Nematodes are nearly impossible to see with the naked eye, but their impact on soybean yields is about to come into clear focus. Thanks to a new digital tool from Syngenta called Nema Digital, the invisible is becoming visible.

The technology uses satellite imagery and artificial intelligence (AI) to scan soybean fields for crop stress that mimics nematode damage. According to Kirt L. Durand, PhD, Syngenta digital ag solutions R&D manager, the goal is to bridge the gap between what a farmer sees and what is actually happening in crops beneath the soil surface.

“Farmers might not even know that they’re losing yield due to this microscopic pest, and that’s what this technology is really all about – providing awareness,” he says.

How the Algorithm “Thinks”

Nema Digital is a satellite-based algorithm trained to distinguish nematode pressure from other common crop-production headaches like nutrient deficiencies, soil compaction, or simple field anomalies. By analyzing multiple years of historical satellite data, the system searches for specific patterns that match known nematode behavior and damage.

For farmers and retailers, the process is designed to be hands-off. Syngenta only needs basic information—field boundaries and crop history—much of which is already automated for those using the Syngenta Cropwise platform.

“Really, most of this is very automated at this point, very little input required from the farmer,” Durand says.

Once the data is incorporated, the AI filters out any visual noise.

“When we get done, it narrows it down and says, with high accuracy 90% of the time, this is going to be a problem caused by nematodes,” Durand says.

The Limits of the Soil Probe

While traditional soil sampling has been the standard tool to check for nematodes, Durand notes research shows how easy for a sample to miss them.

He points to research from Iowa State University nematologist Greg Tylka, which shows that nematode egg counts can vary wildly just a few feet apart. You could pull a core sample that looks clean, while two feet away, thousands of eggs are feeding on your profits.

“You can imagine that if you’ve been looking for nematodes simply by soil sampling, it’s not accurate enough,” Durand says.

Protecting the Bottom Line

The financial stakes of nematode pressure are high. Research from The SCN Coalition indicates that nematodes commonly cause a 25% yield loss in infected soybean fields, but in severe cases—or when multiple species like root-knot and soybean cyst nematode (SCN) team up—that loss can skyrocket past 70%.

“When you have multiple species of nematode present, the impact on soybeans tends to be even more severe than just SCN alone,” Durand says.

One way Durand says farmers and retailers will be able visualize that impact is to pair Nema Digital results with yield maps. By overlaying the nematode output on harvested yield, Durand says growers and retailers often can see a clear connection between areas flagged for nematode pressure and zones of lower yield.

“You can actually see in the field where we identify that you have a nematode problem, and if you put a yield map on it, we’ve seen that those areas tend to have lower yields versus the average yield for that entire field,” he says.

Commercial Launch In 2027

While Nema Digital is being piloted through select retail partners and their farmer customers in 2026, Syngenta expects a broad commercial launch next year.

For soybean growers wondering about the return on investment for the technology, Durand stops short of assigning a specific dollar figure. But he stresses that identifying nematode pressure is the first step to protecting yield with available tools, including Syngenta’s new broad-spectrum nematicide seed treatment, Victrato.

Ultimately, Durand’s message to growers is simple: don’t confuse “invisible” with “absent.”

“The issue is out there,” he says. “We want to help farmers be aware of it and what they’re losing.”

Syngenta To Exit Global Paraquat Production

Thu, 05 Mar 2026 16:43:17 GMT

Syngenta has announced it will cease global production of the herbicide paraquat by the end of June. The decision marks a significant shift for the company, which first brought the active ingredient to market more than 60 years ago.

According to a company news release, the move is driven by an increasingly competitive global landscape. The rise of generic products has eroded Syngenta’s competitiveness in manufacturing the herbicide. Today, paraquat is registered for sale by more than 750 companies worldwide and accounts for less than 1% of Syngenta’s total global sales.

UK Facility Will Advance Plinazolin Technology

Following an asset review, Syngenta is phasing out production at its Huddersfield, UK, site—its only manufacturing facility for paraquat globally.

Despite the closure of the paraquat unit, Syngenta remains committed to the UK location, recently completing a £50 million (approximately $63 million) investment to manufacture its advanced Plinazolin technology at the site.

Plinazolin is a new insecticide active ingredient intended to support resistance management across a wide range of crops. The company reports the technology is now cleared for use at the federal level and will enter the U.S. market pending individual state authorizations.

“This decision is about focusing our resources where they deliver the greatest value for our business and our customers,” said Mike Hollands, head of Syngenta global production and supply.

Syngenta Focuses On New U.S. Priorities

Paraquat has long been a staple in the U.S. farming toolbox, particularly for growers utilizing conservation practices like no-till farming. Syngenta maintains that the herbicide is safe when used according to registered label instructions and intends to work with partners and customers to ensure a smooth transition through the production phase-out.

The company stated its exit plan for paraquat aligns with its broader strategy to prioritize innovation in seeds, biologicals, and AI-enabled digital and precision agriculture solutions.

Regarding plinazolin, it will enter the 2026 growing season for U.S. farmers as a seed treatment, soil-applied formulation or foliar spray. Syngenta said it plans to market five products built on the technology:

Opello for corn rootworm control
Equento as a seed treatment for wireworm and other below-ground pests in cereals and pulse crops
Vertento for cotton, peanuts and onions
Incipio for a range of vegetable crops
Zivalgo for potatoes and tree fruit

All five products belong to IRAC Group 30, a classification associated with novel chemistries for insect management. Syngenta stated that the formulations are designed to match the specific requirements of different crops and pests, and to integrate with existing application practices.

Western Corn Rootworm: How To Stay Ahead Of The Billion‑Dollar Bug

Mon, 02 Feb 2026 22:24:07 GMT

By the time you see corn plants falling over in late summer, it’s too late to change the outcome if it’s the result of below-ground feeding by western corn rootworm (CRW) larvae.

CRW larvae target developing corn nodal roots, pruning them as they grow. In severe cases, they can destroy entire nodes, reports Aaron Gassmann, Iowa State University entomologist and professor.

“They’ll feed on the actively growing node and prune it, or basically stop those roots from growing,” says Gassmann. “Sometimes they’ll actually prune it all the way back to the base of the plant. There can be complete nodes that are simply absent.”

The impact on corn yield can be severe. Research from the University of Illinois and the University of Wisconsin indicates that each missing node can reduce yield by 15% to 17%.

Moving Beyond ‘Plant It and Forget It’

While Bt (Bacillus thuringiensis) technology has historically helped farmers control CRW, the pest has evolved. After over a decade of research, Gassmann warns that the “plant Bt and forget it” era is over. Effective management today requires a diversified strategy, particularly in continuous corn fields where the problem is most common.

Gassmann recommends using rotation, varied traits, and in-season scouting to break the cycle. His advice depends heavily on whether Bt resistance is already present in your fields. Here are the two scenarios he recommends:

Scenario A: You Likely Do Not Have Resistance Present

Don’t rely on Bt alone: Keep it in the toolbox, but diversify.
Rotate to soybeans: This remains the single best method to address the pest.
Stay vigilant: Follow refuge requirements and scout routinely.
Switch it up: Avoid long-term continuous corn with the same trait package.

Scenario B: You Suspect (or Have Confirmed) Resistance

Rotate immediately: Rotating out of corn is the necessary first step.
Change the plan for future corn: Consider non-Bt hybrids paired with insecticide, or carefully selected new traits (e.g., RNAi).
Be selective with sprays: Use adult beetle sprays only when scouting confirms they are well-timed and justified.
Don’t repeat mistakes: Assume that planting the same Bt hybrid again will only worsen the problem.

Why Bt Alone Is Struggling

Farmers often ask Gassmann why Bt has worked so well against European corn borer but has not been as effective with CRW. The difference lies in the “dose” of toxin, he says.

Bt traits provide a “high dose” of toxin for corn borers. However, Bt traits generally provide a lower dose of toxin for CRW. This allows CRW insects with even a single copy of a resistance gene to survive, mate with other survivors in the same field, and pass that resistance on to the next generation.

Gassmann and his colleagues have documented field-evolved resistance to all four Bt toxins used against rootworm (the three Cry3-based traits and the Gpp34/Tpp35 trait).

A Note on Soil-Applied Insecticides

While combining soil insecticides with Bt can improve standability and protect corn roots in the short term, Gassmann notes it is not a perfect cure:

It rarely reduces adult emergence significantly.
It continues to select for resistance (survivors are still Bt-resistant).
It adds input costs that may not pencil out for farmers’ bottom line.

In many cases, if Bt is clearly failing in your fields, it may make more sense to switch to non‑Bt hybrids plus insecticide, or better yet, rotate out of corn, rather than stack more cost on a compromised trait, he adds.

The complete podcast featuring Aaron Gassmann is available via the Crop Protection Network here .

To help farmers make informed decisions about their seed choices, Chris DiFonzo, professor & field crops entomologist at Michigan State University, provides the Handy Bt Trait Table for U.S. Corn Production , a valuable resource that outlines available Bt traits, their targets, and other key information.

Put More Spray Where It Pays

Thu, 29 Jan 2026 16:58:40 GMT

When you pull the sprayer into fields each spring, you’re banking that the product coming out of the nozzles will land where you need it to work. That’s where drift reduction adjuvants (DRAs) can become one of the most profitable—and protective—ingredients in your tank.

Consider what happens when you spray a crop protection product. Each nozzle throws out a spectrum of droplet sizes, from big “marbles” that fall quickly to tiny “dust” droplets that hang in the air, explained Greg Dahl, director of adjuvant education for the Council of Producers & Distributors of Agrotechnology (CPDA), during a recent Agricultural Retailers Association webinar.

Those tiny droplets, called driftable fines, are the troublemakers. They lose energy fast, ride the wind and can move well beyond your field. That’s not the case for larger droplets.

“Big droplets have to land. They are going to land, and they’re going to land close to where you spray,” Dahl says. “Small droplets, they probably are not going to land. They will lose their speed, and then they’ll just float in the air and go wherever the air goes.”

By design, DRAs shift more of your spray volume into larger, heavier droplets that are still effective but far less likely to drift. Across a wide range of nozzles, Dahl says industry research shows that adding a DRA can reduce the spray volume made up of driftable fines.

“Going across the whole system of nozzles, we get about a 50% reduction in the amount of spray volume that is made up of driftable fines,” he reports.

In practical terms, that means less product left hanging in the air and able to drift toward your neighbor’s crops, garden or yard.

There are at least four benefits to adding a good quality DRA in the tank.

(WinField United)

Drift Control Is Only Part Of The Benefit From DRAs

Many farmers are concerned that bigger droplets going out of the nozzles will automatically result in poorer coverage, particularly in post-emergence applications. In some cases — especially with ultra-coarse sprays — that’s true, Dahl says. Coverage can suffer, and penetration into the crop canopy can be weak. The right DRA, though, has been shown to increase droplets’ speed as they leave the nozzle, which improves penetration into the crop canopy.

“If we look where we have added in a DRA, it has actually increased the amount of speed of those droplets, so they’re going to go farther before they run out of energy, and we’re going to get better penetration of the canopy, better deposition farther down,” Dahl says.

Side-by-side comparisons in corn and soybeans using fluorescent dye tell the story more completely (see below). Without a DRA, Dahl’s slides illustrate that coverage is good on the top leaves of the crop but falls off quickly as the product moves down into the plant. With a deposition-type DRA, coverage is more balanced from the top to below the ear leaf in corn and throughout the soybean canopy.

A good quality DRA helps provide good product coverage all the way through the crop canopy, as noted in the plant on the right.

(Greg Dahl)

The ROI Of Improved Product Applications

Better coverage does show up in yield results, Dahl reports. Across hundreds of corn fungicide trials, for instance, he says adding a DRA to the tank delivered an average yield increase of about 5.7 bushels per acre compared to fungicide use alone.

In wheat, similar work showed nearly a 4‑bu.-per-acre advantage.

There’s also an economic advantage in terms of product retention. When you reduce the number of driftable fines, more of the active ingredient you paid for actually lands and stays in your field instead of drifting away.

Dahl says not all DRAs and nozzle combinations are created equal. Some thicker, polymer-type products can narrow the spray angle or even increase driftable fines with the wrong nozzle used, especially Venturi designs. That’s why choosing proven products matters. He says oil-emulsion DRAs, in particular, have shown they can cut driftable fines without creating an overly thick spray or sacrificing pattern quality.

“There’s almost 500 labels that recommend using CPDA-certified adjuvants, and there’s over 200 products that are CPDA-certified adjuvants,” Dahl says, referencing the website CPDA.com . “We think that’s where you should go for information, and we thank you for that,” he adds.

Iowa Farmer Battles Today's Pests While Eyeing Tomorrow's 'Mean Sixteen' Threats

Fri, 12 Dec 2025 18:52:50 GMT

For Worth County, Iowa, farmer Sarah Tweeten, the list of high-priority agronomic threats isn’t a political abstract — it’s a harsh reality she deals with every season.

Farming with her parents, Brian and Julie, and her uncle Roger, Tweeten has been steering the partnership toward more resilient cropping practices since joining the operation in 2021. This includes shifting from conventional tillage to strip tillage and splitting nitrogen applications.

The changes are part of a broader mindset: Protecting yields today from weeds, disease and insects while aggressively preparing for the next generation of agronomic threats. This forward-thinking approach is what led Tweeten to Washington, D.C., earlier this week as a Farm Journal Foundation farmer ambassador to help introduce a new report: “ The Mean Sixteen: Major Biosecurity Threats Facing U.S. Agriculture and How Policy Solutions Can Help. ”

Today’s Battles and Tomorrow’s Warnings
Researched and developed by Stephanie Mercier, PhD, the report takes an in-depth look at 16 significant pest issues U.S. farmers face now or could realistically in the future.

Tweeten is already battling a couple of the problems that underpin the urgency behind the research. For example, Palmer amaranth (pigweed) is gaining ground in her fields and across Iowa. The pervasive broadleaf weed can drastically reduce yields, with studies showing corn yield reductions between 11% and 91% and soybean yield reductions of 17% to 68%.

“We’ve struggled with pigweed as it continues to establish more resistance to our herbicides in our toolkit,” Tweeten says.

Two additional agronomic issues the report details include:

1. Asian Soybean Rust. First detected in the U.S. in Louisiana in 2004, this fungal disease has spread to southern states like Georgia and Mississippi. Scientists warn that warming winters could enable its migration to the Midwest, adding to existing disease pressures.

2. Corn Ear Rot. It can lead to aflatoxin production, making corn unmarketable and posing risks to humans and livestock. Aflatoxin is an issue Pickens County, Ala., farmer Annie Dee says is an ongoing problem for corn growers in her area.

“If we have aflatoxin, it can be impossible to sell the corn,” says Dee, also a Farm Journal Foundation Farmer ambassador.

A more recent threat she references is the impact of Highly Pathogenic Avian Influenza (bird flu) on local poultry farms.

Since January 2022, HPAI has been confirmed in a commercial or backyard poultry flock in all 50 states.

(USDA)

“An important market for us is poultry feed meal, so that’s a constant worry. The trickle-down effect is if we can’t move our corn then we can’t meet our financial obligations,” Dee adds.

Despite agricultural R&D offering a high ROI — $20 in benefits for every $1 spent — the Farm Journal Foundation report notes public funding for ag research has been declining over the past two decades.

“Farmers urgently need sustained support for aflatoxin research and prevention because these risks threaten our yields, our markets and the trust consumers place in American agriculture,” Dee says.

U.S. public spending on ag research and development has been falling for two decades.

(USDA-ERS)

African Swine Fever Has ‘Devastating Potential’
Looking to the future, Tweeten says she is concerned about African swine fever (ASF) and its potential to impact crop farmers as well as hog producers. The highly contagious swine disease hasn’t been detected in the U.S. mainland, but it isn’t far away. ASF has been confirmed in the Caribbean countries of Haiti and the Dominican Republic, roughly 700 miles from Miami, Fla.

“Being a farmer from Iowa, where we have probably eight times the amount of pigs as we do people, an outbreak of ASF would be just devastating to our state,” Tweeten says.

Hogs are among the biggest customers for the corn and soybeans Tweeten and her family grow. If African swine fever were to shut down hog production or exports, it wouldn’t just be a blow to livestock producers – it would hurt the entire agricultural community, she contends.

Read about 5 livestock diseases that could impact U.S. food security and economic stability.

Food Security Is National Security
When it comes to justifying funding for ag research, Tweeten knows there’s competition for every federal dollar. But she believes agriculture deserves a front-row seat — not only because of its economic weight and impact on farmers, but because of its role in national security.

“There’s that argument that food security is national security,” she says. “If there’s one thing COVID made us aware of, it’s that a disruption to our food chain can be terrifying, quite frankly.”

The pandemic made consumers and policymakers more aware of supply chain vulnerability. In 2020, the shock to the supply chain came from a human disease and logistical bottlenecks.

(Sarah Williams Photography)

Next time, Tweeten says, the disruption could just as easily come from animal or plant disease — whether African swine fever in hogs, Asian soybean rust or some other pathogen in crops. She worries about scenarios where farmers could face a fast-moving disease or crop pest while critical tools are still hung up in regulatory delays.

Her message: Farmers need a full toolbox, not one that’s half-built by the time a threat arrives.

“Ag needs to be in a good position when these sorts of emerging diseases and pests come into the country,” she says, “to have the tools in our toolbox ready for farmers to pull out.”

About the Farm Journal Foundation
The Farm Journal Foundation is a farmer-centered, non-profit, nonpartisan organization established in 2010. It works to advance agricultural innovation, food and nutrition security, conservation, and rural economic development.