Weather Prohibits Early Soil-Applied Herbicides

While recent rainy conditions have prevented farmers from using soil-applied herbicides, one Purdue Extension specialist reminds corn growers that many products can be applied post-emergence.

“Almost all chloroacetamide/atrazine premix products can be applied to emerged corn,” said weed scientist Bill Johnson.

But he also said growers need to take precautions to prevent plant injury.

“Atrazine and chloroacetamide injury is more common in cool, cloudy weather and wet soils because these conditions slow a corn plant’s ability to metabolize or detoxify herbicides,” Johnson said. “Corn will be stressed after coming through a cool, wet period and will be more susceptible to herbicide injury.”

Once corn has emerged, farmers should be careful not to apply chloroacetamide/atrazine premixes in nitrogen solutions. Most labels state that atrazine premixes should be applied only with water once corn has emerged.

“Nitrogen solutions are effective in promoting herbicide uptake and causing necrosis on leaves by themselves, resulting in the burning and yellowing injury we occasionally see,” Johnson said. “A few products do allow post-emergence applications in nitrogen solutions, but growers should consult the label if they have questions about a specific product.”

Tank-mixes of 2,4-D with chloroacetamide/atrazine premix applied post-emergence also can injure crops if applied improperly. Acetochlor (Harness, Surpass, Volley, and others) labels indicate that 2,4-D should not be applied within 7-14 days before or 3-5 days after planting, but it should be applied before crop emergence.

Johnson said applications within 7-14 days before planting can injure corn by being washed down into the corn seed germination zone, or seed furrow. Applications after planting can cause injury if the combination contacts corn foliage.

“If in doubt about the crop injury potential of a specific chloroacetamide/atrazine premix, consult the label to see if it is allowed, or do not tank-mix 2,4-D with chloroacetamide/atrazine premixes and apply to emerged corn,” he said.

Should farmers have fields where corn is yellow and stressed from cool, wet weather, they should wait a few days to allow corn to recover from cold stress before applying herbicides.

Treatments containing atrazine will control many small, emerged broadleaf weeds. But, according to Johnson, emerged grass weeds tend to be more of an issue.

“Atrazine has activity on emerged grasses, and it is most effective when applied at high rates to very small grasses,” he said. “Products containing rimsulfuron will provide some foliar residual control of grass weeds and can be mixed with either the atrazine premixes or with glyphosate or glufosinate in Roundup Ready or Liberty Link corn.

“Larger grasses will require the addition of post-emergence herbicides.”

For a table with a full list of corn products that have both some burndown capability and can be applied post-emergence, visit the Purdue Extension weed science Web site.

(Source: Indiana Ag Connection)

Leave a Reply

Herbicides Stories

Palmer pigweed seedhead in cotton
HerbicidesStudy: Fall Weed Controls Can Make Significant Impact On Glyphosate-Resistant Palmer Amaranth
July 28, 2016
An article published in the latest issue of the journal Weed Science shows that adopting harvest-time and post-harvest weed controls Read More
Palmer pigweed in soybean stubble
HerbicidesSpecial Issue Of Weed Science Explores Human Aspects Of Herbicide Resistance
July 27, 2016
Weeds that evolve resistance to herbicides are a serious threat to global agricultural production. In this Special Issue of Weed Science, Read More
Kochia
Crop InputsNufarm Launches New Herbicide for Resistant Kochia
July 25, 2016
Nufarm introduces Scorch herbicide for U.S. farmers and ranchers combating a broad range of troublesome broadleaf weeds. A unique premix Read More
Soybean Field
HerbicidesOnly ENLIST Technology Provides Tolerance To Three Key Herbicides in Soybeans
July 13, 2016
The herbicide applications have been made, and growers are busy scouting their soybean and cotton fields to see if weeds Read More
Trending Articles
Southeast Farmers Coop - Finished Building
Retail FacilitiesNew Stueve Facilities Offer Ag Retailers Speed, Accuracy
July 9, 2016
Leading the industry in planning and constructing dry fertilizer storage and chemical warehouse solutions, Stueve Construction helped three ag retailers Read More
Heritage Cooperative
Retail FacilitiesKahler Automation Designs State-Of-The-Art Facility For Heritage Cooperative
July 4, 2016
Heritage Cooperative in Marysville, OH, needed an efficient liquid, dry and grain facility to serve the many needs of their Read More
The Andersons Waterloo
ManagementFirst Indiana Facility Certified Under 4R Nutrient Stewardship Certification Program
June 27, 2016
The 4R Nutrient Stewardship Certification Program has announced that The Andersons, Inc.’s Waterloo, IN, facility has been added to its Read More
Food IT
Industry NewsCalifornia Event Will Mix Ag And Tech Professionals To Explore IT Solutions
June 20, 2016
Silicon Valley is hot on agriculture, and an upcoming event in California will bring together the food and tech industries Read More
Monsanto Luling Plant
Eric SfiligojWhat’s Next For Monsanto?
May 31, 2016
For the folks at Monsanto’s headquarters in St. Louis, MO, it has been an eventful few weeks. Back on May Read More
Soybean Plant closeup
Industry NewsMonsanto Rejects Bayer Bid; Open To More Talks
May 25, 2016
Monsanto Co, the world’s largest seed company, turned down Bayer AG’s $62 billion acquisition bid as “incomplete and financially inadequate” Read More
Latest News
FertilizerGypsum Added To List Of Conservation Practices
July 28, 2016
Crop farmers in a growing number of states may be eligible for financial assistance from the USDA’s Natural Resources Conservation Read More
Management2016 CTIC Cover Crop Survey: 33% Report ROI From Cover …
July 28, 2016
Insight from 2,020 farmers from across the country reflected enthusiasm for cover crops and—for the fourth year in a row—found Read More
Palmer pigweed seedhead in cotton
HerbicidesStudy: Fall Weed Controls Can Make Significant Impact O…
July 28, 2016
An article published in the latest issue of the journal Weed Science shows that adopting harvest-time and post-harvest weed controls Read More
InsecticidesSyngenta: Beware Of Early Stinkbug Threat To Soybeans
July 28, 2016
With the record warm temperatures this past winter and confirmations from early entomologist reports, Syngenta encourages growers to monitor stinkbug Read More
Peanut field
Crop InputsVerdesian Introduces New Inoculant For Peanuts
July 28, 2016
As planning begins for the next growing season, Verdesian Life Sciences adds Primo Power CL, a new liquid inoculant, to Read More
Soil Young Corn
Crop InputsSmithsonian: 5 Things to Know About New GMO Labeling Bi…
July 27, 2016
On July 14, the House of Representatives passed a bill requiring large food companies to label products containing genetically modified Read More
Palmer pigweed in soybean stubble
HerbicidesSpecial Issue Of Weed Science Explores Human Aspects Of…
July 27, 2016
Weeds that evolve resistance to herbicides are a serious threat to global agricultural production. In this Special Issue of Weed Science, Read More
CHS Primeland
CropLife 100CHS Businesses In Washington, Idaho Combining For Great…
July 27, 2016
As full-service ag retailers, CHS Primeland and CHS Farmers Co-op collectively serve farmers and other customers in 15 counties in Read More
Storage Tanks at Nachurs
Crop InputsNACHURS Joins Field to Market
July 27, 2016
NACHURS announced today that it has joined Field to Market: The Alliance for Sustainable Agriculture, a leading multi-stakeholder initiative working Read More
Illinois Researchers
FertilizerMeasure Of Age In Soil Nitrogen Could Help Precision Ag…
July 26, 2016
What’s good for crops is not always good for the environment. Nitrogen, a key nutrient for plants, can cause problems Read More
Kochia
Crop InputsNufarm Launches New Herbicide for Resistant Kochia
July 25, 2016
Nufarm introduces Scorch herbicide for U.S. farmers and ranchers combating a broad range of troublesome broadleaf weeds. A unique premix Read More
ManagementNew Rabobank Report Calls for Farmer ROI Focus
July 25, 2016
As U.S. row crop farmers brace themselves for a third year of negative margins, Rabobank believes farmers must lower the Read More
Syngenta Sign
Crop InputsBloomberg: Syngenta-Chem China Deal on Track for Regula…
July 25, 2016
Syngenta AG, which has agreed to be taken over by China National Chemical Corp. for $43 billion, said talks with Read More
ManagementGROWMARK Meeting Visit, Company Takeover Updates, and R…
July 22, 2016
Editors Paul Schrimpf and Eric Sfiligoj discuss their recent speaking engagement at GROWMARK’s eastern event, crop protection company merger rumors, Read More
Crop InputsMonsanto: EU Approves Roundup Ready 2 Xtend Imports
July 22, 2016
Monsanto Co. announced today that the European Commission has granted import approval for Roundup Ready 2 Xtend soybeans. This milestone Read More
Syngenta headquarters in Basel, Switzerland
Crop InputsSyngenta Announces Alfalfa Seed Split Off
July 22, 2016
On September 1, 2016, Syngenta will transfer sales and distribution of alfalfa seed to the NEXGROW branded business that is Read More
Dow DuPont
Crop InputsDuPont, Dow Shareholders Approve Merger
July 21, 2016
DuPont and The Dow Chemical Company announced that, at their respective special meetings of stockholders held today, stockholders of both Read More
ManagementLand O’Lakes Announces SUSTAIN Business Unit, Oth…
July 20, 2016
Land O’Lakes, Inc. today announced the formal organization of a new business unit, SUSTAIN, and its leadership. SUSTAIN will focus Read More