Monthly Archives: September 2017

A weed-free field leads to higher yield potential at harvest

Lyndsie Kaehler

Lyndsie Kaehler
U.S. corn herbicides product manager
Dow AgroSciences

September is a time for reflection as the growing season ends and you and your customers spend countless hours in the field for harvest. If your customers found themselves chasing weeds this season, now is the time to consider adjustments to next season’s weed control program.

If weeds are left to grow with, or ahead of, corn at the beginning of the season, yield potential is already decreasing. Research from Iowa State University has shown that the most competitive weeds in corn are about 3 to 4 inches tall at the V3-V4 corn growth stage, and these weeds can reduce yield by about 3 bu./A for every day they are left uncontrolled. From planting until canopy closure, it’s critical to keep fields weed-free so corn can grow without being robbed of sunlight, water and nutrients.

Across the Corn Belt, grass and broadleaf weed control continues to be a high priority. Many weeds, including waterhemp, giant ragweed, foxtail, Palmer amaranth and velvetleaf, continue to spread and develop resistance to multiple herbicides. To combat resistant weeds in cornfields, Dow AgroSciences is proud to offer multiple residual herbicide solutions with versatility and multiple modes of action to control weeds several ways.

SureStart® II herbicide and Resicore® herbicide can be used together in a program approach or separately to meet your customers’ agronomic needs. SureStart II is a proven performer applied preemergence, or at planting, and can be followed by Resicore early postemergence. This program approach provides four modes of action to control your customers’ weeds in corn, including herbicide-resistant species. Plus, farmers can add atrazine and glyphosate to the program for six unique modes of action.

As combines move through fields this fall, remind your customers that a residual herbicide with multiple modes of action can give corn a clean start against their worst weeds next season. Visit PowerOverWeeds.com or contact your Dow AgroSciences sales representative to plan a weed control program for 2018.

Clean corn rows in Illinois after a preemergence application of 2 pt. SureStart® II herbicide followed by 1.25 qt. Resicore® herbicide postemergence.

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. Resicore and SureStart II are not registered for sale or use in all states. Resicore and SureStart II are not available for sale, distribution or use in Nassau and Suffolk counties in the state of New York. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions. ©2017 Dow AgroSciences LLC

Elevore™ herbicide receives federal EPA registration

Innovation to fall and spring burndown programs is now reality with the announcement by Dow AgroSciences that Elevore herbicide has received federal registration by the U.S. Environmental Protection Agency (EPA).

When tank-mixed with glyphosate and/or 2,4-D, Elevore can be applied up to 14 days before planting in corn and soybeans for thorough control of high-anxiety weeds, including marestail up to 8 inches tall. Labeled for use prior to planting soybeans, corn and cotton, Elevore is now available for farmers to use in the 2018 spring burndown season.

“Unlike many other burndown herbicides, Elevore elevates a farmer’s program by preventing regrowth of emerged weeds,” says Jon Doran, portfolio marketing leader, Dow AgroSciences. “In field trials conducted by Dow AgroSciences over several years, Elevore provided excellent activity on marestail at various heights, including 8-inch-tall marestail. We have also seen consistent control across a wide range of geographies.”

Powered by Arylex active, a new Group 4 growth regulator, field trials show Elevore herbicide effectively controls labeled broadleaf weeds, including glyphosate- and ALS-resistant marestail, lambsquarters, cutleaf evening primrose and henbit.

The low use rate of 1 ounce per acre makes Elevore an excellent fit in reduced- and no-till production systems for burndown applications before planting. Elevore can be applied with a farmer’s current burndown program in spring or fall in various climate conditions, including cooler temperatures.

Matt Stagg, a farmer from Bunkie, Louisiana, is impressed with the weed control he experienced in a 5-acre field trial using Elevore conducted on his farm in 2016.

“We had a range of weeds and various sizes of marestail present in the field trial,” Stagg says. “Adding Elevore to our current protocols definitely gave the other products an edge on knocking it down. I also see incorporating a burndown protocol using Elevore and coming back with a preemerge herbicide application as a strong resistance management program. Every year, preemerge herbicides are becoming more of a need as resistance continues increasing.”

Elevore herbicide contains Arylex active and is a novel class of herbicides that acts through a synthetic auxin mechanism to control broadleaf weeds in burndown. Absorbed mainly through leaves, shoots and roots of plants, Arylex active is translocated through the plant for effective control. Although Arylex active is not considered a new mode of action, it does have unique binding affinity that is different from other auxin herbicides such as 2,4-D.

“Visual signs of control aren’t immediately apparent because Arylex active is absorbed by the plant’s cells where the herbicide binds with specific auxin receptors in the cell’s nucleus,” says Jeff Ellis, Ph.D., field scientist, Dow AgroSciences. “The delayed response is due to the gradual, albeit complete, absorption process. Once absorbed by the plant’s nucleus, Arylex active halts growth and the plant dies, providing complete control.”

For more information, visit ElevateYourBurndown.com or contact your Dow AgroSciences sales representative.

®™DOW Diamond, Arylex, and Elevore are trademarks of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. Elevore is not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Arylex is a registered active. Always read and follow label directions. ©2017 Dow AgroSciences LLC

Iowa farmer combats tough grasses with SureStart® II herbicide

Brent Halling of Perry, Iowa, began farming 41 years ago during a drought-stricken season. It was a bit drier than the 2017 growing season, but he says it was similar. Today, Halling farms about 1,000 corn and soybean acres with his brother and continues to find new ways to protect the yield potential of his crops.

“In Iowa, you have to control the grasses,” Halling says. “That’s the biggest robber of yield in my opinion. In my case, it’s mostly yellow and giant foxtail. SureStart II does a great job with that, and it is broad-spectrum to also control the broadleaf weeds.”

A supporter of crop rotation, Halling rotates all of his acres every year, with very little continuous corn. With 41 years of farming experience, he also makes careful plans to use a flexible herbicide that will keep his corn clean until canopy.

“I get corn planted, then come back in and have that window of up to 11-inch tall corn [to apply SureStart II],” Halling says. “I have a bigger window to work with to deal with Mother Nature.”

Along with grasses, Halling combats velvetleaf, waterhemp and morningglory in his cornfields. In the last few years, Halling has seen a resurgence of morningglory, but he has not had many problems with Palmer amaranth yet. As herbicide-resistant weeds creep into many fields across the Midwest, Halling is staying focused on controlling difficult grasses with multiple modes of action.

“I’m not a big believer in overusing glyphosate products,” Halling says. “I’ve had good luck using SureStart II and not using any glyphosate on my corn.”

Proven to perform under heavy weed pressure, SureStart II contains three modes of action to protect against emerging weeds for up to six weeks after application. To learn more about how your customers can use SureStart II to control a broad-spectrum of weeds and grasses, visit GetMoreTime.com or contact your Dow AgroSciences sales representative.

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. SureStart II is not registered for sale or use in all states. SureStart II is not available for sale, distribution or use in Nassau and Suffolk counties in the state of New York. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions. ©2017 Dow AgroSciences LLC

Enlist™ Weed Control System Expands With Addition of Enlist One™ Herbicide

With the ability to tank-mix with several products, including glufosinate herbicides, farmers can make Enlist One a cornerstone of their weed control programs that feature multiple modes of action. Enlist One joins Enlist Duo® herbicide, a proprietary blend of 2,4-D choline and glyphosate, in the herbicide lineup for the Enlist system.

“Farmers growing Enlist cotton have found the flexibility of Enlist One to be especially helpful. They get the benefits of 2,4-D choline and the ability to tank-mix with glufosinate for effective weed control,” says John Chase, Enlist commercial leader. “With two Enlist herbicides, farmers can select the one that best fits their weed management needs. Both contain Colex-D® technology to help them land and stay on target.”

Enlist One has received federal registration for use in 34 key cotton, corn and soybean states.

Flexibility and convenience with Enlist technology
Farmers who have had Enlist cotton, corn and soybeans on their farms have seen the exceptional weed control and on-target application benefits of Enlist Duo herbicide. Enlist One delivers each of these same benefits plus additional tank-mix flexibility.

Many Southern farmers had the chance to use Enlist One on a trial basis as part of their weed control programs. They took advantage of the ability to tank-mix the new herbicide with a glufosinate herbicide to help control Palmer amaranth, marestail, giant ragweed and other troublesome weeds.

“The tank mix of 2,4-D choline and glufosinate really did exactly what we wanted it to. Two weeks after application, we had excellent control,” says Austin Warbington, Georgia farmer, who faces tough weeds such as pigweed. “We were able to eliminate most weeds. It really took care of business. If you walked out and looked at any weed, you’d see the majority of them were very crispy.”

As with Enlist Duo® herbicide, Enlist One features Colex-D® technology and is designed to land and stay on target. Farmers can capitalize on the same on-target application benefits of near-zero volatility and minimized potential for physical drift.

Addressing farmers’ needs with innovative solutions
Dow AgroSciences leads the way in providing herbicide solutions that help farmers reach their weed management goals. With the addition of Enlist One herbicide, farmers have a choice between two herbicides containing 2,4-D choline for their Enlist crops. They can select the convenient blend of Enlist Duo herbicide, or they can use Enlist One for greater flexibility to customize their weed control program. Tank-mix partners for both herbicides are listed on EnlistTankMix.com.

Learn more about the Enlist weed control system and what growers are saying at Enlist.com/ExperiencingEnlist. You also can follow the Enlist system on Twitter at @EnlistOnline or go to the YouTube channel.

Georgia farmer Austin Warbington included Enlist One herbicide in his weed management program this year and has been pleased with the results.

®™Dow Diamond, Colex-D, Enlist, Enlist Duo, Enlist logos, and Enlist One are trademarks of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. Enlist Duo and Enlist One herbicides are not registered for sale or use in all states or counties. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your area. Enlist Duo and Enlist One herbicides are the only 2,4-D products authorized for use in Enlist crops. Always read and follow label directions. ©2017 Dow AgroSciences LLC

 

Ongoing evaluation key to controlling weeds, improving yield in soybeans

As the sun bears down on record U.S. soybean acres, farmers keep their eyes on their fields to evaluate weed control decisions made earlier in the year. Ongoing scouting and peer discussions near harvest can help your customers fight back against persistent weeds the following season.

Every field potentially has unique weed management challenges depending on weather, soil type and weed control methods, which is why it’s hard to make decisions solely based on other farmers’ experiences. In addition to conversations with farmers, Dow AgroSciences field scientist Dave Ruen recommends consulting with trusted retailers, herbicide and seed suppliers, and Extension weed scientists for additional support.

“At this point in the season, farmers can see weed control performance firsthand in their own fields and ask specific questions to improve their programs for the following season,” Ruen says. “Herbicide-resistant weeds, particularly Palmer amaranth and waterhemp, are top of mind for many Midwest farmers this year.”

Ranked as two of the most troublesome and most common weeds of 2017 by the Weed Science Society of America, waterhemp and Palmer amaranth can cause devastating yield loss if left uncontrolled.

A preemergence first strike against waterhemp and Palmer amaranth can give soybeans the early season boost needed to improve yield potential. The best strategy to control these weeds includes a program approach using preemergence and postemergence herbicides with multiple modes of action.

Sonic® herbicide can be applied in the fall, preplant incorporated, preplant or preemergence up to three days after planting, before soybeans emerge. With two nonglyphosate modes of action, Sonic controls many broadleaf weeds resistant to glyphosate, including waterhemp, Palmer amaranth, giant ragweed and common ragweed.

Another way your customers can battle herbicide-resistant weeds is to stay current on newly identified resistance in their geography and keep detailed notes of specific weed pressure in their fields. Electronic files are easy to customize for individual fields based on crops and known weeds. Plus, they can be used as visual aids to build an inventory or cropping mix, and program solutions for the 2018 season.

Read more about waterhemp, Palmer amaranth and controlling other high-anxiety weeds from Dow AgroSciences field experts at OperationCleanFields.com.

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. Sonic is not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions. ©2017 Dow AgroSciences LLC

Withered weeds give farmers using Enlist Duo® herbicide reason to celebrate

Farmers have been facing increasingly intense weed pressure. It’s a rewarding sight when they find row after row of brown, shriveled weeds after an effective herbicide application. Controlling weeds allows the crop to thrive while limiting the seedbank that will produce weeds in future years.

That’s what farmers are seeing this summer after applying Enlist Duo® herbicide to their Enlist crops. They’re reporting extremely good weed control of even their toughest weed species.

“It was good to go into the field the next day and see weeds starting to curl up,” says Darin Anderson of North Dakota, who is growing Enlist soybeans this year under the Dow AgroSciences Field Forward program. “You know it’s working. You don’t see that with all herbicides.”

Cotton growers are seeing the same thing. This is the first year they’ve made postemergence applications of Enlist Duo — a novel combination of 2,4-D choline and glyphosate.

“We want a clean field,” says Austin Warbington, a cotton farmer from Georgia. “You could say we have a zero-tolerance policy for any type of weed. If we see it, we go get it.”

This year, Warbington saw wilted weeds soon after application. “A week after applying 2,4-D choline to the weeds we saw excellent control,” he says. “The weeds were brown and crispy.”

Other growers are seeing the same quick-acting effects and finally gaining the upper hand on their toughest weed challenges. You can help them achieve cleaner and more productive fields by educating them about the benefits of the Enlist weed control system.

Visit Experiencing Enlist to learn how other farmers are seeing similar results. Also check out our YouTube channel or follow us on Twitter at @EnlistOnline.

Farmers appreciate seeing weeds that shrivel and are controlled after an application of Enlist Duo® herbicide.

®™DOW Diamond, Enlist, Enlist Duo, the Enlist Logo, Enlist One and Field Forward are trademarks of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. The Enlist weed control system is owned and developed by Dow AgroSciences LLC. Enlist Duo and Enlist One herbicides are not registered for sale or use in all states or counties. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your area. Enlist Duo and Enlist One herbicides are the only 2,4-D products authorized for use in Enlist crops. Always read and follow label directions. ©2017 Dow AgroSciences LLC

Weed of the month: Burcucumber

burcucumber

Photo credit: Theodore Webster, USDA Agricultural Research Service, Bugwood.org

  • Common name: Burcucumber
  • Scientific name: Sicyos angulatus
  • Grass or broadleaf: summer annual broadleaf
  • Native to the United States
  • Resembles a cultivated cucumber
  • Burcucumber can be identified by its hairy, heart-shaped leaves and long vines.1
  • Burcucumber has separate male and female flowers (monoecious) that are white to pale yellow in color.2
  • Burcucumber develops forked tendrils, which can wrap around and climb up whatever the weed is able to reach, to attain sunlight.1 Vines can spread up to 25 feet and twine around corn plants. The weight of the vines can lodge corn, making it difficult to harvest.3
  • The fruit on the plant are typically produced in clusters of three to 20 and resemble cucumbers covered with bristles.4
  • The weed is typically found in low-lying areas near creeks and rivers, but it can be found on upland areas.

Fast facts

  • When burcucumber grows in direct competition of soybeans, it can reduce yield up to 48 percent.1
  • Burcucumber plants emerging in June can produce up to 42,000 seeds per plant.2
  • The hard seed coat the weed produces contributes to the prolonged seed dormancy, which means that fields infested with burcucumber will have a lasting seed reservoir in the soil and the potential for a burcucumber problem for many years.4
  • Burcucumber can germinate and emerge from soil depths up to 6 inches.4

Burcucumber control/management tips

David Hillger, Ph.D., Enlist field specialist, says:

  • To control burcucumber, follow a weed management program that includes residual herbicides and timely applications.
  • Farmers should look at their weed spectrum and select products that have the most effectiveness on their troublesome weeds. For burcucumber, if the selected postemergence product can be tank mixed with a residual product, farmers may want to consider this treatment for a final postemergence application.
  • At harvest, farmers should take care not to transport seed from an infested area to other parts of their fields or other locations. Farmers and retailers should initially bypass those areas in the field with the combine, return to them at the end of harvest and then follow with a thorough cleaning of the combine.
  • Use no-till in fields affected with burcucumber seeds. No-till allows burcucumber seeds to remain toward the surface, reducing the amount of time the seeds can germinate.

Dow AgroSciences weed control solutions:

Corn
SureStart® II herbicide
Resicore® herbicide
Keystone® NXT herbicide
Keystone® LA NXT herbicide 

FulTime® NXT herbicide
Surpass® NXT herbicide 
Durango® DMA® herbicide
Duramax® herbicide
Enlist Duo® herbicide, as part of the Enlist weed control system

Soybean
Sonic® herbicide
Surveil® herbicide
Durango® DMA® herbicide
Duramax® herbicide
Enlist Duo® herbicide, as part of the Enlist weed control system

Additional information:

More information can be found through these weed science resources:

Identification and Control of Burcucumber, University of Illinois
Why Residual Herbicides are Important Tools in Battling Hard-to-Control Weeds, University of Nebraska-Lincoln
Weed Management ― Burcucumber, Penn State Extension

Sources:

1 University of Missouri. 2014. Weed of the month: Burcucumber (Sicyos angulatus), An Agronomic Pest on the Increase.
https://ipm.missouri.edu/IPCM/2014/9/Burcucumber-An-Agronomic-Pest-on-the-Increase/
2 Purdue University. 2005. Identifying and Controlling Burcucumber.
https://www.btny.purdue.edu/WeedScience/2005/Burcucumber05.pdf
3 Purdue University Extension. 2011. Study to determine best management strategy for burcucumber in corn.
http://www.dairyherd.com/dairy-resources/forage/Study-to-determine-best-management-strategy-for-burcucumber-in-corn-117524034.html
4 Pennsylvania State University. 1997. Managing Burcucumber in Agronomic Crops.
http://extension.psu.edu/pests/weeds/control/managing-burcucumber-in-agronomic-crops/extension_publication_file

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. The Enlist weed control system is owned and developed by Dow AgroSciences LLC. FulTime NXT, Keystone LA NXT and Keystone NXT are federally Restricted Use Pesticides. Enlist Duo and Enlist One herbicides are not registered for sale or use in all states or counties. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your area. Enlist Duo and Enlist One herbicides are the only 2,4-D products authorized for use in Enlist crops. Duramax, Durango DMA, FulTime NXT, Keystone LA NXT, Keystone NXT, Resicore, Sonic, SureStart II, Surpass NXT and Surveil are not registered for sale or use in all states. FulTime NXT, Keystone LA NXT, Keystone NXT, Resicore, SureStart II and Surpass NXT are not available for sale, distribution or use in Nassau and Suffolk counties in the state of New York. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions. ©2017 Dow AgroSciences LLC