Weeds are relentless year after year, leading farmers, retailers and agronomists across the Midwest to find new ways to control difficult and herbicide-resistant weeds in corn and soybean fields.
While the weed spectrum hasn’t changed much in recent years, the available methods and level of difficulty to control these weeds has changed. We’re seeing several trends, as part of a sound herbicide program, that are helping farmers improve ROI and counter weed pressure.
To overcome challenging weeds in corn and soybeans, here are three top weed-fighting strategies to keep in mind this season.
1. Invest in multiple herbicide passes
The timing of herbicide passes is shifting. There are instances when farmers prefer to apply a residual herbicide shortly after planting rather than before. Herbicide timing largely depends on the weed spectrum and density. With increasing herbicide resistance, a two-pass program is the best way to keep weeds small throughout the season.
To control weeds early – even ahead of planting – farmers can tank-mix burndown herbicides with residual herbicides to plant into a clean field. Dow AgroSciences recently received federal registration from the U.S. Environmental Protection Agency for Elevore™ herbicide, powered by Arylex® active, which can be applied up to 14 days before planting in soybeans and corn. Elevore is tank-mix-compatible with commonly used burndown and residual partners, including 2,4-D and glyphosate, for thorough control of many broadleaf weeds, including marestail up to 8 inches tall.
2. Layer residual herbicides to extend weed control
Farmers should overlap, or layer, residual herbicides to control tough weeds like Palmer amaranth and waterhemp, which germinate throughout the growing season. Farmers can use Resicore® herbicide or SureStart® II herbicide for residual control in corn and Sonic® herbicide or Surveil® herbicide for long-lasting control in soybeans.
3. Control pigweeds early before they progress across fields
Waterhemp and Palmer amaranth continue to be driver weeds in corn and soybeans. Waterhemp is slowly taking over more acres each year, and if a farmer is in an area where it was just starting to get bad last year, it’s likely getting worse.
In soybeans, farmers can also improve control of tough weeds, including the pigweed species, by planting narrow rows of seven to 15 inches. This allows the crop to shade the row much quicker, which reduces weed germination and emergence.
For more information about customizing a weed control program for waterhemp, Palmer amaranth and marestail, visit PowerOverWeeds.com.
Waterhemp and Palmer amaranth continue to be driver weeds in corn, leading farmers to find different ways to control these difficult and herbicide-resistant weeds. With trusted residual control, Resicore® herbicide can give your customers power over more than 75 tough weeds and grasses that rob corn yield, profit and time.
In addition to controlling weeds, Resicore is proud to sponsor Season 2 of the Power to Do More contest to give three communities the power to do more this year. Three farmers will win $10,000 for their community and a trip for two to their dream sports field.
Visit PowerToDoMore.com to vote for one of the 10 finalists from eight Midwestern states, including Illinois, Indiana, Iowa, Kansas, Minnesota, Nebraska, North Dakota and South Dakota. You can vote for your favorite finalist daily and share the voting website with your customers, co-workers and community until Sunday, April 22.
To learn more about how Resicore can help your customers gain power over weeds this season, visit PowerOverWeeds.com.
The Agriculture Division of DowDuPont™ has announced a new name: Corteva Agriscience™ (kohr-teh-vah), a combination of words meaning “heart” and “nature.” The company will adopt this name once it is spun off from the current parent company, which is expected to happen by June 1, 2019.
“This is the start of an exciting journey,” says James C. Collins Jr., chief operating officer, Agriculture Division of DowDuPont. “Corteva Agriscience is bringing together three businesses with deep connections and dedication to generations of farmers.
“Our new name acknowledges our history while looking forward to our commitment to enhancing farmer productivity as well as the health and well-being of the consumers they serve. With the most balanced portfolio of products in the industry, nearly a century of agronomic expertise and an unparalleled innovation engine, Corteva Agriscience will become a leading agriculture company, focused on working together with the entire food system to produce a secure supply of healthy food.”
Corteva Agriscience brings together DuPont Crop Protection, DuPont Pioneer and Dow AgroSciences to create a market-shaping, stand-alone agriculture company with leading positions in seed technologies, crop protection and digital agriculture.
The company will continue to work with ag retailers to bring valuable new products to market through a solid and balanced pipeline. Corteva Agriscience will continue to work with retailers and farmers to ensure agriculture finds smarter ways of sustaining life, revitalizing how farming is done and ensuring progress.
The intended company has developed world-class talent, technology, innovation and R&D capabilities that uniquely positions it to transform the food system by helping farmers grow better, abundant and healthier crops while using fewer natural resources.
“We will continue to invest in some of the most recognized and premium brands in agriculture: Pioneer®, Mycogen®, and the newly launched Brevant™ seed brands, as well as our award-winning crop protection products, such as Aproach® Prima fungicide and Quelex™ herbicide with Arylex® active, while bringing new products to market through our solid pipeline of active chemistry and technologies,” Collins says.
The intended agriculture company unveiled the Corteva Agriscience™ brand identity and logo (see www.corteva.com) at Commodity Classic, the largest farmer-led convention and trade show in the United States.
The corporate headquarters for Corteva Agriscience will be located in Wilmington, Delaware. Sites in Johnston, Iowa, and Indianapolis, Indiana, will serve as Global Business Centers, with leadership of business lines, business support functions, R&D, global supply chain, and sales and marketing capabilities concentrated in the two Midwest locations.
With commodity prices at a current low, it’s now more important than ever for your customers to ensure they’re getting the most out of their inputs. One solution? Implementing the 4R Nutrient Stewardship practices for fertilizer application and maintenance.
The 4Rs of nutrient stewardship consist of a guiding framework that centers upon applying the right source of nutrient, at the right rate, at the right time and in the right place. From this framework, your customers can track and achieve their cropping goals, such as increased production, profitability, environmental protection and sustainability.
Regardless of the market health, each growing season is still laden with uncertainty and risk regarding temperatures and precipitation patterns. However, by applying the 4R practices and using the right nitrogen stabilizer, your customers can extend nitrogen availability in the soil, maximize the efficiency of their nutrient management and protect their inputs from leaching and denitrification, even with fluctuating commodity prices and during the most ambiguous environmental conditions.
By using nitrogen stabilizers like Instinct® and N-Serve®, your customers are able to keep nitrogen in the right place up to eight weeks longer and, ultimately, maximize their growth to benefit their nutrient management plan.
For more information on the 4Rs, visit www.nutrientstewardship.com/4rs. For additional details on nitrogen stabilizers like Instinct and N-Serve, visit MaxInMaxOut.com, or contact your local Corteva Agriscience™ sales representative.
Weeds are becoming more persistent. As more farmers adopt minimum-tillage programs, weeds are coming up earlier and thicker. With more weeds developing resistance to certain herbicides, an effective burndown program is almost essential to a successful campaign against weeds.
“Starting with a clean field is paramount to maximizing the yield potential in today’s production systems,” says David Hillger, Ph.D., Enlist™ field specialist. “If you allow weeds to have a head start, no matter how small they are, they can rob potential profit from your operation.”
It’s a classic case of “if you snooze, you lose.” Sure, weather and other farm-related responsibilities can make it difficult for farmers to achieve timely burndowns of every field. But retailers can help remind customers about the importance of starting with a clean field and keeping it clean the entire growing season.
A helpful burndown option
Tyler Tietjen, a Nebraska farmer, used Enlist Duo® herbicide as a burndown last spring. “I want clean fields when I start,” Tietjen says. “I expect the field to be 100 percent clean. Enlist Duo got everything. The field was clean after using it for burndown.”
Hillger encourages farmers to try Enlist™ herbicides for burndown. Enlist Duo® herbicide contains new 2,4-D choline as well as glyphosate. The combination helps control a broad range of tough and stubborn weeds.
Enlist One™ herbicide is a straight-goods 2,4-D choline that offers additional tank-mix flexibility. This allows farmers to tailor their burndown program by combining modes of action to target their specific weed challenges.
Get the jump on weeds
“Not having a good burndown program is like beginning a marathon an hour after the starting gun goes off,” Hillger says. “It might be possible to get those weeds back under control, but any delays or missteps makes it more difficult to avoid yield losses due to competition for resources.”
Hillger notes the highest yield potential during the season is when the crop is planted. “Doing whatever we can to give that crop the best opportunity to establish and compete in its surroundings helps us preserve more yield,” he says.
Retailers can help customers design an effective burndown program. Most university websites cite 2,4-D as a growth regulator herbicide that offers effective broadleaf control for burndown applications.
“Using 2,4-D simply works,” Hillger says. “It’s predictable. It’s been a staple of weed control programs for many years.
“The advantages we see with the new Enlist Duo and Enlist One are that you have the proven effectiveness of 2,4-D while gaining the added comfort of lower odor and improved on-target application from the Colex-D technology found in these products,” Hillger says.
Four key benefits
Like those using Enlist™ herbicides for postemergence applications, farmers who use these products for burndown experience the benefits of Colex-D® technology:
- Near-zero volatility
- Minimized potential for physical drift
- Low odor
- Improved handling characteristics
“It’s important to get effective herbicide modes of action onto the field early,” Hillger says. “Generally speaking, it’s the early bird that gets the weeds.”
- Common name: Pitted morningglory, tall morningglory, ivyleaf morningglory
- Scientific name: Ipomoea lacunosa, Ipomoea purpurea, Ipomoea hederacea
- Grass or broadleaf: Summer annual broadleaf
- Native to the United States, and widespread across the country
- Except for the palm leaf morningglory, the first two morningglory leaves that emerge are butterfly-shaped.
- Morningglory species can be identified by leaf shape, leaf hairs and flower color. Tall morningglory and ivyleaf morningglory produce purple or bluish-purple flowers, while pitted morningglory produces smaller, white flowers.
- The weed produces large, hard seeds with an impermeable seed coat, making it tough to control.
- Although there are no confirmed cases of herbicide resistance in morningglories, a tolerance to glyphosate has been documented.1
- A single tall morningglory plant per row foot can potentially cut soybean yield in half.1
- Depending on the species, each morningglory plant can produce as many as 15,000 seeds.1
- According to the Southern Weed Science Society, morningglories have been listed among the most common and most troublesome weeds for soybean growers in the organization’s weed surveys dating back to 1973.2
A fact that may surprise you …
- Despite being considered a troublesome weed by farmers, morningglories are prized by gardeners for their colorful, trumpet-shaped flowers.
Morningglory control/management tips
Applying herbicides before planting and/or preemergence can provide good-to-excellent control of the morningglory species often found in crop fields. Postemergence herbicide applications are also recommended to control heavy infestations. In addition, planting in a narrow-row system to close the canopy more quickly can inhibit weed growth by decreasing sunlight available to the germinating morningglory plant.
“In corn, morningglory often germinates after the crop reaches 12 inches tall,” says Andy Asbury, Enlist™ field specialist. “Atrazine, though effective, can’t be applied to corn after it reaches this height.” ™
Asbury notes growers can apply Enlist herbicides later in the growing season, up to the V8 growth stage or 30 inches, allowing control of more germinated morningglories.
“Morningglory in soybeans are often hidden by the crop canopy,” Asbury says. “The Enlist weed control system allows application of Enlist herbicides in soybeans through the R2 growth stage. The 2,4-D choline in both Enlist Duo and Enlist One herbicides is very effective in controlling vines such as morningglory.”
Corteva Agriscience™, Agriculture Division of DowDuPont™, weed control solutions:
SureStart® II herbicide
Keystone® NXT herbicide
Keystone® LA NXT herbicide
FulTime® NXT herbicide
Surpass® NXT herbicide
Durango® DMA® herbicide
Enlist Duo® herbicide, as part of the Enlist™ weed control system
Enlist One™ herbicide, as part of the Enlist weed control system