Syngenta Thrive

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With increasing pressure from Pythium and Phytophthora infections posing a significant threat to soybean yield, growers are looking for an additional tool to protect their crop.

The Environmental Protection Agency recently granted federal registration for that tool: CruiserMaxx® APX seed treatment, Harnessing the novel active ingredient picarbutrazox, CruiserMaxx APX adds unmatched Pythium and Phytophthora protection to the proven broad-spectrum disease and insecticide protection base seed treatment. CruiserMaxx APX offers more uniform emergence, stronger roots and quicker speed-to-canopy.

CruiserMaxx APX will be available for limited trials in 2022 and more broadly available in 2023. To learn more, visit SyngentaUS.com/CruiserMaxxAPX.

© 2022 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties. Please check with your local extension service to ensure registration status. CruiserMaxx® and the Syngenta logo are registered trademarks of a Syngenta Group Company.

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Because California only receives around 21 inches of rainfall annually, growers in the state know how to do a lot with a little. For example, they use irrigation and smart water techniques to ensure orchards, row crops and livestock succeed.

“We have no other choice in California ― being water conscious is a necessity,” says Ethan Nichol, a California independent crop consultant.

Water management from California to Maine and every state in between is complex. It requires data about soil moisture and crop moisture uptake, and information about current and upcoming weather conditions. New technologies are more important than ever when it comes to water management in flood, drip and center-pivot irrigation.

Understand Farm Water Consumption

It’s difficult to measure improvement without benchmarking. Growers must know where fields stand today to measure savings from better water-use efficiency.

“One of the biggest struggles I’ve seen is farmers don’t always know how much water they’re putting down on fields,” says Dayna Gross, sustainability manager of partnership and programs for Syngenta North America. “Step one is increasing monitoring to understand what is actually being put out on the field.”

To understand where your operation stands, USDA’s Sustainable Agriculture Research and Education group recommends the following steps:

  1. Collect data. Map fields, location of water supply networks, inventory pumping plans, and meters or measuring points. USDA also recommends noting field slope and soil information, including texture, type and infiltration rates. If the field uses irrigation, then document the irrigation method, the schedule, and well construction and testing records.
  2. Audit the operation. Perform a physical irrigation audit to verify water use by reviewing water- and energy-use efficiency on the farm.
  3. Create a report. Data collection and audit information will provide evidence needed to generate a report about equipment, irrigation schedules and water uses across the operation. This report will provide practical information, such as when to schedule maintenance and how to improve irrigation systems overall.

“That measurement piece and record keeping are key,” says Steven Wall, sustainability development manager for Syngenta North America. “And new tools can help you understand soil moisture and plant health so you can use all of this information to get the right amount of water to the plant at the right growth stage.”

Use Technology to Inform Decisions

The days of walking fields to check for moisture stress aren’t over yet, as soil probes are still widely used, but certain tools help focus scouting efforts. From satellites and drones to stationary soil monitors and plant-sensing technologies, growers can increasingly turn information into action.

“Remote sensing is a great tool, and imagery is a great way to get a feel for how crops are doing,” Wall says. “Aerial imagery is one way to see discoloration or other indicators of plant stress.”

Seed and agronomy companies are taking note. Syngenta, for example, launched the Water+™ Intelligent Irrigation Platform, allowing users to control irrigated corn production and grow corn with less water. It’s a collaboration with growers, industry partners and Lindsay Corp.

Growers have more precise information about irrigation on-farm with the Water+ Intelligent Irrigation Platform, which brings together Syngenta genetics, crop protection inputs, agronomic advice, and irrigation technology and equipment. It informs planting, controls pivots, and provides crop monitoring — including irrigation recommendations and updates — from laptops or phones.

Monitoring crops for moisture use enables greater efficiency than soil sensing alone. In California, Nichol saw an 800 pound-per-acre difference in almond yields field-to-field when he gave trees moisture as needed instead of using a flat rate across the operation. He began using an irrigation decision support tool from Phytech in 2016 to make these changes.

The Phytech sensor-based system works directly on the plant, informing operators about plant health and water needs based on moisture uptake.

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Step one is increasing monitoring to understand what is actually being put out on the field.

Dayna Gross Sustainability Manager of Partnership and Programs
at Syngenta North America

Comparing two orchards where he used the Phytech technology, Nichol found that the one he expected to produce higher yields was demanding 20% less water than the other. It turned out that due to pest pressure, the orchard was not performing as well as usual. By giving the trees what the monitors indicated was needed, he saved critical water resources.

“If I was only looking at the soil moisture probes, I would have over-irrigated for sure,” he says. “Without that feedback, we would have wasted water and money.” Smart water resource allocation not only reduces costs, but it also means farmers, ranchers and orchard operators are being more sustainable.

“What’s exciting as we start using more technologies for irrigation is creating greater efficiencies,” says Wall. “If we reduce pumping because we see that we’re using too much water, we save energy and water consumption costs while maintaining productivity. On top of that, we benefit aquifers and the environment overall. It’s a win-win.”

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Many tree nut and citrus growers recently watched their margins erode due to increasing input costs, questionable water availability and lackluster crop prices. Phytophthora root rot, which can reduce tree efficiency and yield potential, puts further pressure on their bottom lines.

“Here in California, growers are running on razor-thin profits,” says Garrett Gilcrease, Syngenta agronomy service representative based in Hanford, California. “Even a minor Phytophthora infestation can cost thousands of dollars a year.”

In Florida, citrus producers face added challenges from Diaprepes root weevils and Huanglongbing (HLB), or citrus greening, both of which damage tree roots.

“When you combine HLB, which can cause major root loss, with Diaprepes root weevil and Phytophthora, it’s a recipe for tree loss,” says Zach Langford, Syngenta sales representative based in Lake Wales, Florida.

Get Ahead of Phytophthora

Gilcrease and Langford say growers can get ahead of Phytophthora root rot with an integrated approach that includes proper irrigation management, resistant rootstocks, soil and root sampling, and fungicide treatments, if warranted.

A water mold, Phytophthora thrives under wet conditions, infecting tree roots and reducing their ability to pull water and nutrients from the soil.

Gilcrease says the pathogen was common when California orchards were flood irrigated. It waned as growers converted to pressurized irrigation systems and began planting on berms. But Phytophthora root rot resurged recently because drip and micro-sprinklers only wet the top foot or so of the soil surface, he says, noting that the key to preventing the disease is proper irrigation management. This includes not overwatering, especially in the spring before trees have fully leafed out and use less water. Growers also should avoid soil compaction and use practices that aid water infiltration.

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Even a minor Phytophthora infestation can cost thousands of dollars a year.

Garrett Gilcrease Agronomy Service Representative at Syngenta

As a soilborne pathogen, Phytophthora may infest nut and citrus tree roots years before above-ground symptoms appear. Tree health declines as the infection progresses, causing reduced fruit set, poor vegetative growth, early leaf drop and even tree death.

Take Advantage of Free Soil Programs

Langford and Gilcrease recommend scouting and soil sampling to catch issues early. Syngenta offers a Soil Pathogen Assessment (SPA) program to gauge Phytophthora propagules in California and Arizona orchards. In Florida, Syngenta provides the similar Citrus Soil Assay program.

Charlie McKee, a Florida-based citrus producer in Lake Wales and production manager with Donley & Myers Grove Caretaking, says he has used the Citrus Soil Assay program for 10 to 15 years. It provides information on his own groves and gives him statewide data about citrus tree health.

“It helps you see what’s going on with the root mass and propagules, so you can get the best timing for treatment,” says McKee. “It helps maximize your dollar as much as possible.”

In California and Arizona, Gilcrease says the SPA program began about 10 years ago for citrus growers. It has since expanded into tree nuts. Each year, Syngenta representatives in the two states collect about 1,200 samples for testing. They initially collected only soil samples, which were assayed for Phytophthora propagules ― a type of vegetative reproductive body. If a Phytophthora species wasn’t active at the time of sampling however, lab soil tests often didn’t detect them. Gilcrease says Syngenta representatives now collect soil as well as root samples. As part of pathogen assessment, the laboratory runs ELISA (Enzyme Linked Immunosorbent Assay) tests on roots to detect a protein unique to Phytophthora.

Langford says he also looks at the disease load metric, which is a treatment threshold based on the number of propagules found in the soil, when making treatment recommendations.

“This metric adds another layer of information to help make the best recommendation,” Langford says.

Develop a Resistance Management Program

When lab results warrant a fungicide treatment, Gilcrease and Langford say growers have a handful of options they can rotate for resistance management. Phosphorous acid is a Group 33 fungicide also widely used as a fertilizer. According to University of California – Riverside (UCR) studies, several Phytophthora species have developed resistance or reduced sensitivity as a result.

Ridomil Gold® SL fungicide, a Group 4 soil-applied fungicide from Syngenta, protects trees from soilborne oomycete diseases, including Phytophthora root rot. It is injected through micro-sprinkler or drip systems.

Ridomil Gold GR fungicide is a soil-incorporated granular formulation. The active ingredient in both Ridomil Gold GR and Ridomil Gold SL products ― mefenoxam ― builds up around roots stopping current and preventing future infections.

And Orondis® fungicide — a Group 49 soil-applied fungicide also from Syngenta — controls 11 Phytophthora species, according to UCR trials*. Injected through micro-sprinkler or drip systems and using oxathiapiprolin as its active ingredient, Orondis reduces soil propagules and moves systemically within the tree to improve tree vigor and health.

For more information about the Soil Pathogen Assessment or Citrus Soil Assay programs, contact your local Syngenta representative.

*https://rd.almondboard.com/files/2019%20%20PATH15%20AdaskavegBrowne-Disease%202.pdf

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With few new active ingredients coming to market, industry leaders say maintaining registrations of existing pesticides, such as atrazine, is paramount.

“We need to have multiple tools available to our farmers,” says Bill Johnson, Ph.D., Purdue University extension weed specialist. “This is especially important in a year like this one where there are supply-chain issues. And when you think about the wide variety of pests and environmental conditions, we need to have multiple tools at our disposal as conditions dictate.”

In Arkansas, where at least one population of Palmer amaranth has resistance to six different herbicide modes of action, keeping atrazine is critical, says Tom Barber, Ph.D., University of Arkansas extension weed scientist.

“We’ve got a lot of five-way resistant populations in the state that are pretty widespread, and atrazine is still one of the only herbicides that is highly effective on those populations,” he says.

A Potentially Costly Loss

Because atrazine is applied mostly to corn, sorghum and sugar cane, its unique mode of action also can benefit weed control in rotational crops such as cotton and soybeans, where it isn’t used.

“It’s part of an integrated approach with crop rotation to help manage our Palmer amaranth,” Barber says. “Taking that away would mean more applications of multiple residual herbicides. We would probably have to make at least three applications just to overlap residuals. A lot of times that would mean two applications more than we’re making now.”

Johnson says the loss of atrazine would make weed control more costly and difficult for Indiana corn and sorghum producers without a guarantee of environmental benefits.

“I think we would really struggle with control of some weeds, like morning glory, waterhemp, giant ragweed, and newly germinated annual grasses that are common in cornfields,” he says. “We’d have to pick up those weeds with other herbicides that aren’t as effective and are more expensive. And we would be replacing one product with another product that may not put us at a better place environmentally.”

Having fewer weed-control options also could increase resistance selection pressure on the remaining herbicides, Johnson says. Already, Indiana has waterhemp populations resistant to four different modes of action, and testing is underway on suspected resistance to a fifth mode. A number of other weeds, including Palmer amaranth, marestail and giant ragweed, have confirmed resistance to multiple modes of action.

Arkansas’ Barber agrees, saying growers in his state would likely apply more pounds of herbicide active ingredient per acre if atrazine weren’t available. It also could confound weed control for growers of non-GMO corn hybrids.

Atrazine allows them to successfully grow a crop using conventional seed, “and they’re getting excellent yields,” he says. “It would possibly make growers move to a technology that has glufosinate.”

But that technology has its own set of challenges as Barber and fellow University of Arkansas weed scientists have identified three Palmer amaranth populations with tolerance to glufosinate.

Benefits to No-Till

In Indiana, about half the acres that receive atrazine are farmed conventionally and half are in some form of no-till or conservation tillage. In those systems, growers keep plant residue on the surface and minimize soil disturbance to significantly reduce soil erosion, Johnson says.

In recent years, no-till production also has been praised for helping store carbon in the soil — benefiting soil health and global warming. The loss of the herbicide could prompt some growers to return to tillage, potentially increasing soil carbon releases, says Mark White, Syngenta senior stewardship and regulatory portfolio manager.

Industry Support

Barber and Johnson were among eight Weed Science Society of America (WSSA) members who submitted letters to the EPA in 2021 supporting the current uses and rates of atrazine. Their comments were in response to EPA’s draft Endangered Species Act biological evaluations for triazine herbicides, which include atrazine, simazine and propazine.

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We’d have to pick up those weeds with other herbicides that aren’t as effective and are more expensive. And we would be replacing one product with another product that may not put us at a better place environmentally.

Bill Johnson, Ph.D. Purdue University

The evaluations are part of the agency’s pesticide registration review, conducted at least every 15 years on each crop protection product or group of products.

The review is just the latest of many that atrazine has undergone since it was initially registered in 1958. Over the years, EPA made several label changes — including designating it a restricted-use material — to better protect workers, the environment and nearby crops.

Caydee Savinelli, Ph.D., Syngenta stewardship team and pollinator lead, says the company continues to support pesticides like atrazine because they are highly effective. They also make sound business sense for both the farmer and the registrant.

As part of that effort, Syngenta updated its atrazine.com website in 2020 to better reflect key safety information, studies and the herbicide’s benefits.

“We know that the public is interested in the safety of their food,” says Chris Tutino, Syngenta senior communications manager. “So, we redesigned the site to help people understand and share the science behind atrazine’s safety that ultimately leads to higher crop production in an increasingly food-insecure world.”

In addition, Savinelli says, safeguarding domestic food production moved into the public spotlight during the pandemic as imports were disrupted — creating supply-chain issues.

“I think it’s important for us to support the American farmer,” she says. “Farmers are business people. They have to make a profit, and the margins on commodity crops are not that high.”

From a weed-control standpoint, Mark White, Syngenta senior stewardship and regulatory portfolio manager, says atrazine continues to perform after more than 60 years of commercial use.

In fact, researchers have conducted more than 7,000 studies on atrazine over the years, making it likely the most-researched pesticide in history.

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“The overwhelming scientific consensus points to the safety of atrazine both to human health and ecological health,” White says.

Savinelli and White say Syngenta remains a strong supporter of proactive and regulatory stewardship of its products, including the triazines.

Clarify Public Value

Genevieve O’Sullivan, vice president of communications and marketing for Crop Life America, says one challenge with communicating these types of issues to the public is the frequent use of industry terms, such as no-till or cover crops.

Instead, O’Sullivan likes to demystify the terms. Take sustainability, for example. She defines it as “simply using technology to produce more using less.”

To start the conversation, O’Sullivan says industry representatives need to first listen to the public’s concerns. These approaches are based on consumer research Crop Life conducted during the past three years.

“We actually went out and listened,” she says. “What questions do you have? What are your concerns? That’s how we started the real conversation.”

In addition, the industry needs to take an informational approach, O’Sullivan says, instead of a persuasive one.

“Don’t try to convince anybody of anything,” she says. “It’s important to create shared values.”

Update

On June 30, 2022, EPA announced that it was adopting a new aquatic ecosystem concentration equivalent level of concern (LOC) for atrazine at 3.4 parts per billion (ppb), down from 15 ppb. The scientific and regulatory record completely and categorically refutes this new LOC, says Tutino. For additional information and updates, please visit atrazine.com.

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Since early 2021, there have been rumbles of enthusiasm and frustration about soybean oil prices right beneath the surface. Soybean growers and processors have been thrilled about record-high prices, but end-users of soybean oil, especially bakers, have had a significant case of sticker shock. What, exactly, has been going on?

Soybean Oil Prices Surge Higher

Soybeans are a bit unique in that they are a component crop. This means the economic value of growing a bushel of soybeans is derived from the value of the crop’s two primary outputs from the crushing process: meal and oil. Historically, Missouri soybean oil prices hit a high of $0.55 per pound between 2011 and 2012 (Figure 1). After those highs, prices fell to around $0.30 per pound for several years. In 2021, however, prices surpassed historic records. They abruptly jumped briefly above $0.80 per pound and spent most of the year above $0.60. For the entire year, the average weekly price was $0.65 per pound. In other words, the average price for all of 2021 was higher than any single weekly observation since 2010.

For the first five months of 2022, soybean oil prices have been even higher, averaging $0.77 per pound and twice exceeding $0.90 per pound. All else the same, higher soybean oil prices make it attractive for soybean processors to buy and crush soybeans. However, the value of soybean meal and the price of soybeans is also important.

Since 2021, soybean oil has accounted for roughly half of the total value of crushing a bushel of soybeans. This is significant as soybean oil typically accounts for just 25% to 35% of the total economic value. The implication is that the decision to crush soybean — or to build a new crush plant — is heavily influenced by high soybean oil prices.

A Trend Years in the Making

The USDA provides usage data for soybean oil, including the three primary uses (Figure 2). The largest category of soybean oil usage is the “food, feed, and other industrial uses” category. Over the last 12 years, this category has consistently accounted for 14 billion pounds of soybean oil usage. The smallest category of usage is exports. For 2022-2023, soybean oil exports are estimated at 1.4 billion pounds — the lowest levels in more than a decade.

Early in the 2010s, biofuel accounted for roughly 5 billion pounds of soybean oil usage. Since 2014-2015, however, biofuel usage has more than doubled to 12 billion pounds in 2022-2023. More specifically, over the last eight years, usage of biofuel increased at an average annual rate of 10%. For context, the Rule of 72 reminds us that a 10% growth rate results in a doubling every seven years. Overall, this is a pretty aggressive growth rate, especially considering it’s the only growth category within soybean oil.

Looking ahead, one has to wonder if, or when, biofuel might surpass the food, feed, and other industrial uses category.

Wrapping it Up

While the debate around high soybean oil prices came to the forefront in 2021, the increased biofuel usage trend has been underway for several years. In many ways, the current situation feels a lot like the “food versus fuel” debate that corn and ethanol faced around 2010. This time around, however, a better descriptor might be “doughnuts versus diesel.”

Beyond the data, one doesn’t have to go very far to hear about plans to construct a new soybean crush facility. With soybean oil prices maintaining record-high levels, the situation will undoubtedly incentivize the expansion of production. At the farm level, this demand will likely translate into even more soybean acres. All that said, the price of soybeans and the value of soybean meal will also affect the feasibility of widespread sector expansion. At some point, the industry might be searching for answers on how to utilize all the soybean meal created.

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Widmar and Gloy are the co-founders of Ag Economic Insights (AEI.ag). Founded in 2014, AEI.ag helps improve decision making for producers, lenders, and agribusiness through: the free Weekly Insights blog, the award-winning AEI.ag Presents podcast- featuring Escaping 1980 and Corn Saves America, and the AEI Premium platform, which includes the Ag Forecast Network decision tool. Visit AEI.ag or email Widmar(david@aei.ag) to learn more. Stay curious.

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Approximately every five years, most recently in 2018, Congress passes a package of program authorizations and funding commonly known as the farm bill. The legislation has immense consequences for the agricultural industry as it covers everything from crop insurance programs to farmer training to sustainability initiatives.

The latest version, the Agriculture Improvement Act of 2018 (2018 Farm Bill), expires on Sept. 30, 2023. The Act builds upon previous farm bills — but with a few changes from the 2014 legislation. Notably, the $867 billion package expanded programs related to trade, research and extension, specialty crops and organic agriculture, among others.

As we enter the final years of the legislation, we break down the major areas funded by the 2018 Farm Bill.

76% is dedicated to nutrition. The majority of this goes toward the Supplemental Nutrition Assistance Program (SNAP), but the 2018 bill also expanded funding for grants that promote healthy eating and reduce food waste.

9% funds crop insurance through the Federal Crop Insurance Program, which works with the private sector to offer insurance products that primarily compensate producers from losses in yield or revenue.

7% pays for conservation initiatives, including programs that assist producers/landowners improving water/air quality, soil health, wildlife habits and more.

7% is allotted to commodity programs — the two largest of which are Price Loss Coverage and Agriculture Risk Coverage. These initiatives provide price support through market and/or yield declines of certain commodities, which aids in business planning and accessing credit.

1% goes to everything else. Major areas covered include trade, research and extension, rural development, horticulture, and more.

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Agriculture is dominated by trends with small annual changes that play out over several years or decades. There are many examples of this, from yields to producer consolidation, but the trend that’s perhaps easiest to overlook is global acreage.

The adjacent graph shows global harvested acres since 1960. In 2021, world acres were 2.4 billion acres, up 63 million acres since 2016. For context, the U.S. harvested 85.4 million acres of corn in 2021. While 63 million is a small increase compared to the 2.4 billion total, it’s about three-quarters of the area of the U.S. corn crop.

This isn’t the first time global acreage has expanded. In the 1970s, acreage increased by 269 million acres. North America was a significant source of that expansion, contributing 74 million — or 28% — of the total increase. Global acreage again expanded in the 2000s and early 2010s due to demand from ethanol production and soybean trade. That expansion totaled 280 million acres, with South America and sub-Saharan Africa leading the increase at 73 million additional acres each.

Another important takeaway from Figure 1 is that those acres largely remain in production once the expansion occurs. In other words, sizeable global acreage contractions don’t happen, even when ending stocks are high and commodity prices are low. Even throughout the Farm Financial Crisis of the 1980s — when the U.S. government was trying to limit the pains of oversupply through programs such as Payment-in-Kind and Conservation Reserve Program — the overall global acreage trend was sideways.

Oilseeds in the Driver’s Seat

When the global acreage factory expands, it doesn’t do so uniformly across all crops. Of the 63 million acres added in recent years, a staggering 73% of those new acres have gone to oilseeds. While soybeans account for most oilseed gains (+25 million acres), all oilseeds — including peanuts, rapeseed and sunflowers — have increased.

Corn acreage has also trended higher but only gained 15 million additional acres. Across the other primary crops, cotton, rice and wheat posted small expansions, but acres of millet, oats, rye and sorghum were unchanged or lower.

Where the Increases Occurred

In addition to being concentrated by crops, oilseed acreage gains have also occurred in just a few regions and countries. For example, Brazil alone accounted for 44% of the increase between 2016 and 2021. Outside of South America, South Asia — mainly India— and the former Soviet Union region also have been a significant source of expansion.

Russian acreage increased by 8 million since 2016, and Ukraine added another 4.4 million. While many have recently noted these two countries are a significant source of global corn and wheat exports, they’ve also been a source of acreage expansions. The region’s largest crop is wheat — which increased by 4.2 million acres since 2016 — but oilseeds have again dominated the expansion, gaining 11 million additional acres. The crop with the most significant acreage gains within the region was sunflowers, up 6.6 million acres.

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Wrapping it Up

There are several reasons these data can be challenging to follow. First, the year-to-year changes, or variations, can be noisy due to weather-related issues. It often takes several years to establish a trend. Second, world acreage has increased by nearly 800 million acres since 1960, or a 47% increase, but the trend has played out over six decades. On average, this is equal to a lackluster 0.6% annual rate of increase. Third, the global factory expansion cycles between years of slow expansion and stretches of very little change. Taken together, one could monitor these data for several years before observing any significant changes. However, when financial conditions are strong, we can expect global acreage to increase.

Looking ahead, keep in mind the acreage expansion has been underway for at least two years. For example, South America and the former Soviet Union regions began to increase acreage during the trade war. It’s unclear how long the current expansion will last, but a significant element of the “cure for high prices” is already underway. The expansion will eventually begin to ease the current supply concerns.

Widmar and Gloy are the co-founders of Ag Economic Insights (AEI.ag). Founded in 2014, AEI.ag helps improve decision making for producers, lenders, and agribusiness through: the free Weekly Insights blog, the award-winning AEI.ag Presents podcast- featuring Escaping 1980 and Corn Saves America, and the AEI Premium platform, which includes the Ag Forecast Network decision tool. Visit AEI.ag or email Widmar(david@aei.ag) to learn more. Stay curious

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Syngenta recently held a groundbreaking event to celebrate the redevelopment of its North American Crop Protection headquarters in Greensboro, North Carolina.

Syngenta leadership shared a preview of the architectural renderings and innovative site features, including the more than 100,000-square-foot office building that will connect to an existing laboratory facility on campus.

At the event, state and local officials also discussed the local impact of the new headquarters and the legacy of Syngenta in the Greensboro community. For example, the company hired North Carolina subcontractors to make its vision for the redesigned headquarters a reality — an undertaking that will shape the physical and social landscape of Greensboro.

Visit Syngenta US’ website to explore more about the new workspace design.

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Midwest corn growers are coming off their worst season for tar spot since 2018, when many saw it for the first time. By 2021, they had some experience with the disease but were hit hard and suffered severe yield losses, according to Purdue University’s Darcy Telenko, Ph.D.

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Last year we saw a big response (in plant health) to two applications of Miravis Neo, and it gives us one of the widest windows of protection for the plant.

Andrew Tucker Precision Agronomist, Nutrien Ag Solutions

“I think when we get final data in, we’ll probably see more yield loss in 2021 than the other three years combined,” says Telenko, field crop extension pathologist.

Still reeling from their 2021 encounter with tar spot, growers got more bad news: Scientists found viable spores in the season’s field debris. This means the disease will likely be back next season.

“We know it survived in the debris, so it is overwintering,” Telenko says. “From now on, it’s going to be about how much inoculum is in your field, plus the weather conditions.”

Nick Groth, Syngenta agronomy service representative in Wisconsin, says tar spot’s Phyllachora maydis spores have definitely been on the move in his state. The disease expanded its host range over the past few years, and it is currently affecting cornfields throughout Wisconsin.

Don’t Stop Scouting

Tar spot hit with full force in 2021 in the second week of August for many growers, and those who weren’t ready for it realized significant yield loss. That’s why Groth encourages farmers to scout until silage harvest.

“By mid- to late-August, growers may think they’re done scouting, that they don’t need to worry anymore because the yield is made, since by then it could be a month passed tassel,” he says.

But according to Groth, research from Purdue shows that even at full-dent stage, tar spot can result in up to a 20% yield loss*.

“A lot of yield is formed at the end of the year when you’re packing starch there, so you definitely want to stay on your scouting,” Groth says. “We like to say until silage harvest time — that’s about half milk line — and by then, yield loss will be a lot less.”

Andrew Tucker, precision agronomist at Nutrien Ag Solutions in Mineral Point, Wisconsin, helps his customers with scouting by participating in Cropwise™ Imagery — the Syngenta satellite imagery product that helps growers monitor field health by comparing satellite photos taken every three to five days.

“Cropwise Imagery has detected issues in the field that we could scout and figure out exactly what was going on way before harvest,” Tucker says, adding that he recently used it to monitor a trial of hybrids with tar spot. “You could see the differences clear as day.”

Know Your Pest

Josh Pickel, crop specialist at Insight Farm Services in Marshall, Wisconsin, says treatment for tar spot should be one part of a field management plan, not its sole focus. In his area, tar spot had a big impact in corn-on-corn fields where rootworm beetles had already damaged the crop.

“I think we put a lot of blame on tar spot, where if we controlled the root worm feeding early, we probably wouldn’t have had such severe tar spot,” Pickel says.

In hard-hit areas where corn was going from grass-green to brown in 10 days, Pickel conferred with Groth to find a solution.

“We needed to get a three-mode-of-action fungicide on to reduce the tar spot and protect the plants,” Pickel says.

Miravis® Neo fungicide fit that need. With the active ingredients azoxystrobin, propiconazole, and Adepidyn® technology, Miravis Neo provides broad-spectrum disease control and plant-health benefits for increased yield opportunity and harvestability in corn and soybeans.

“It’s been proven in the market and has a long-lasting residual activity,” Pickel says. “We’ve seen really good results with it.”

Tucker has, too.

“Last year we saw a big response [in plant health] to two applications of Miravis Neo, and it gives us one of the widest windows of protection for the plant,” Tucker says.

The agronomists agree that a management plan should consider field history and all potential threats. And tar spot isn’t the only obstacle to maximizing yields in corn, says Tyler Harp, technical development lead for Syngenta.

“Miravis Neo does much more than provide good tar spot control such as providing broad-spectrum disease control on difficult diseases like Fusarium ear rot and gray leaf spot, and it provides significant plant health benefits,” Harp says. “This is one reason why Miravis Neo helps provide consistently higher yields across the Corn Belt — tar spot or no tar spot — compared with other products in the market. Being good on tar spot is very important, but it needs to do more than that to consistently maximize yield potential. That’s the power and benefit of Adepidyn technology and Miravis Neo.”

Choosing a hybrid for its tar spot resistance may seem like a no-brainer, but Tucker says growers should make sure they’re considering what’s best for their ground so they don’t sacrifice yield before they plant.

“We can treat for tar spot,” he says. “You can’t treat for a hybrid that’s not the right fit for a field. It isn’t going to yield for you if you don’t have the right genetics out there.”

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*Adapted from Carter and Hesterman. 1990. Handling Corn Damaged by Autumn Frost. NCH-57. Purdue Univ. Cooperative Extension Service, W. Lafayette, IN 47907.

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With fertilizers at a premium this year, no farmer wants to see them wasted. Or, perhaps worse than wasted, taken over by weeds competing with crops. It is more important than ever to make sure fields are weed-free, and starting early is the best way to minimize the effects of weeds.

Weeds hamper profits not only by reducing yield, but also in more hidden ways such as siphoning valuable resources from crops, says Skyler James, a crop consultant with Crop Quest.

Weeds take water, nutrients, sunlight and leave fewer resources for crops — meaning they are especially harmful for crops’ early development. The longer weeds grow, the more they take.

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The first thing you need to do is start clean so that you don’t plant into any standing weed infestations.

Erin Burns Ph.D. Assistant Professor and weed scientist at Michigan State University

Know the Hidden Costs

Fertilizer is a significant investment from which successful farming operations want to extract maximum value.

“If a guy has already fertilized and has weeds out there, he’s worried about the weeds using moisture and the fertilizer,” says James. “Competition is a real issue you see in the field when weeds aren’t controlled early enough. One thing that really helps is having a good crop canopy to compete with the weeds. For example, if the wheat isn’t fertilized properly, then the stand can be thin; then we have the weeds come in and compete with the wheat.”

Pete Eure, Syngenta technical product lead for soybean herbicides, agrees. “With fertilizer prices being at high levels today,” he says. “Anything you can do to maximize that nutrient-use efficiency is key — meaning removing weeds and keeping them from taking the nutrients.”

Start Clean

With early weed management, it is essential to start with a clean slate.

“The first thing you need to do is start clean so that you don’t plant into any standing weed infestations,” says Erin Burns, Ph.D. assistant professor and weed scientist at Michigan State University. She recommends burndown applications to ensure that all the weeds — any winter annuals or weeds that have emerged before crop planting — are gone.

Burns explains that she has many herbicide trials with control plots where no herbicides are applied. These control plots are excellent evidence of just how detrimental competition from weeds can be for crops.

“Even if you only had minimal weed competition, once weeds have established themselves, they’re competing with crops all season,” she says.

Eure says weeds are constantly fighting for the resources crops need such as sunlight, water, nutrients and space.

“Where we see a lot of the best success in weed control is when the grower comes out with a clean field,” he says. “With no weeds present, crops planted and a solid preemergence herbicide with multiple effective sites of action in place, the fight is largely over before it begins.”

If weeds are not controlled early in the season and become firmly established, harvest efficiency decreases, and a field’s weed seed bank grows. That means growers face unnecessary difficulties throughout the current season and at harvest and will likely start the following season in a less advantageous position regarding weed management.

Think Through Options

Growers can choose from a wide range of practices and products. The most significant opportunity for success lies in figuring out what best fits the operation and what each field needs.

Burns says growers in some areas use cover crops to help manage weeds. Cover crops create shade and block sunlight from weeds — such as the one he sees most frequently, ragweed. Effective cover cropping requires large amounts of biomass to layer the soil surface and impede weed germination.

“If you have shady conditions,” Burns says, “It makes it hard for weeds to make it through that thick layer, and we can have various levels of success.”

Mark Kitt, Syngenta technical product lead for corn herbicides, says each grower has their preferred weed management strategies. He suggests growers consider including herbicides with multiple effective modes of action in their weed-management program such as Acuron® and Acuron Flexi. Kitt says Acuron GT herbicide is the strongest post-emergence knockdown plus residual product for glyphosate-tolerant corn on the market and a great option for growers.

“Acuron GT combines four active ingredients — bicyclopyrone, which is exclusive to Syngenta — as well as mesotrione, S-metolachlor and glyphosate,” Kitt says. “It is specifically designed for post-emergence use in glyphosate-tolerant corn.”

Consider Geography

Of course, a grower’s location is also a significant factor in selecting the best weed control methods for an operation.

In Kansas, T.J. Binns, Syngenta agronomy service representative, says one weed gets most attention these days.

“Out in my world, here in western Kansas, the only weed we talk about right now — and any more — is Palmer amaranth,” Binns says. “We start with tillage, but it doesn’t help much with the Palmer because our Palmer starts emerging later than we plant our corn.”

That’s why he and his peers use different herbicides to attack the weeds head-on. For example, Binns says Acuron is an enormous advantage to growers in his area. He points out that weed control is difficult because there is no one-size-fits-all method. For example, cover cropping doesn’t work well in the dryer Kansas climate.

“The problem is we’re in a very arid environment,” he says. “Where we live, cover crops aren’t used very much because we barely have enough water.”

James agrees and adds that moisture is a make-or-break factor for crops.

“Moisture is normally our limiting factor. There have been several people trying to cover crop, and maybe it helps with the weeds, but it uses so much moisture that the crop yields are usually down in the dry land scenario,” he says. “Under irrigation, they’ve had some success, but it’s pretty limited unless you consider wheat a cover crop.”

Moisture and weather go hand-in-hand in preventing weeds. The weather, James says, heavily affects the possibility of weeds.

“If it’s really dry, which a lot of times it is, we don’t have any weeds sprouting,” James adds. “If we have moisture, we have weeds.”

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