Controlling Volunteer Corn In Soybeans Is Critical

Volunteer corn is much more than a nuisance weed in soybean fields. It could also be a potential threat to the effectiveness of Bt corn hybrids.

A Purdue University entomologist, Dr. Christian Krupke, says that corn hybrids containing insect-resistance genes could become more susceptible to corn rootworms unless growers keep soybean fields free of volunteer corn and continue planting refuge acres.

"What we found was that in areas where triple stack corn was planted in 2006 and soybeans in 2007, we had a great deal of volunteer corn in some of those fields," Krupke says. "Most of that volunteer corn showed up as being Roundup Ready and as having the Bt gene for rootworm."

What worries entomologists is that as producers rotate to soybeans the following year, rootworms feed on volunteer corn and are exposed to Bt toxins produced in the corn plant at less-than-toxic levels, increasing the potential for insect resistance to develop.

More Than a Yield-Robber

Volunteer corn is not an uncommon problem in a typical corn-soybean rotation. And while it’s potential to rob the soybean crop of water, nutrients, sunlight and yield potential has always been known, insect resistance concerns heightens the need for good volunteer corn control.

If you currently plant Roundup Ready corn in your fields, you will need another herbicide besides glyphosate to spray in next year’s Roundup Ready soybean fields to control volunteer corn. "In many cases, if a producer just uses glyphosate in his soybeans, he may need to go in with a second post-emergence treatment containing a graminicide," says Bill Johnson, Purdue University Extension weed scientist. "However, by then the corn has had the opportunity to grow larger and it gives more time for insects to feed, increasing resistance pressure."

Steve Hotovy, Regional Sales Representative with Gowan Company, says this new information increases the need for effective volunteer corn control. "Volunteer corn is a yield robber, especially with current commodity prices," he says. "Producers are looking for effective control."

One graminicide product that has shown consistent control of volunteer corn is Targa herbicide, from Gowan Company. It is a post-emergence grass herbicide that has demonstrated consistent control of both conventional and glyphosate-tolerant volunteer corn in soybeans, in addition to controlling perennial grasses such as Johnsongrass, quackgrass and bermudagrass. Targa can be easily tank-mixed with glyphosate for effective weed control.

"University data does show that Targa’s active ingredient, quizalofop-p-ethyl, provides consistent, effective control compared to other chemistries," says Nick Vandervort, Field Development Manager for Gowan Company. "And Purdue’s findings increase the importance of not only controlling volunteer corn effectively, but doing it as early in the season as possible."
 

Leave a Reply

Latest News
FungicidesSyngenta Launches New Seed Treatment Fungicide
May 22, 2017
Syngenta has announced the launch of PLENARIS seed treatment fungicide for the control of downy mildew in sunflower. PLENARIS contains Read More
Corn close up
Crop InputsMonsanto’s First HPPD Herbicide Garners EPA Appro…
May 19, 2017
Monsanto announced today that EPA has federally approved Harness MAX Herbicide, the first herbicide in the Monsanto portfolio to provide Read More
ManagementPrecision Planting Deal, China Developments, and Enviro…
May 18, 2017
Editors Eric Sfiligoj and Dan Jacobs discuss the latest news on John Deere’s now dead deal for Precision Planting, China’s Read More
Soybean aphid leaf
InsecticidesMulti-state Research Reveals IPM Best Option for Treatm…
May 17, 2017
About 89.5 million acres of soybeans will be planted across the U.S. in 2017 — a record high, according to Read More
GROWMARK-2017-Interns
CropLife 100GROWMARK Names 2017 Summer Interns
May 16, 2017
Forty-two college students are exploring agricultural career opportunities this summer as GROWMARK interns. They are working at FS member cooperatives Read More
Migrant farm workers
LegislationTrump: Immigration Crackdown Won’t Impact U.S. Ag…
May 16, 2017
President Donald Trump said he would seek to keep his tough immigration enforcement policies from harming the U.S. farm industry Read More
Flooded corn in Indiana
FertilizerBoth Wet and Dry Conditions Threaten Nitrogen Loss
May 15, 2017
The weather is notoriously unpredictable, leading to challenges for planting, harvesting and applying the nitrogen (N) your corn crop needs. Read More
farmer Kip Tom
Precision AgAg Tech: On the Cusp of Something Big?
May 15, 2017
The investment and ag-tech sectors’ continuing courtship of agriculture, smoldering for three or four years now, was well in evidence at Read More
AGCO Ratliff featured
Eric SfiligojRemembering Robert Ratliff
May 15, 2017
With all the fast-paced happenings in agriculture this spring, with multiple mergers in the works and planting season in full Read More
Greg Musson, Gar Tootelian
ManagementOpinion: Shaking Your Perspective in Ag Retail
May 12, 2017
Some of you I’m sure have encountered our recently retired salesman extraordinaire, Dan Bellanger. He worked in the industry for Read More
Exterior view of CPS Big Lake facility which includes enclosed receiving and load out area
CropLife 100New Alternative Weed Resistance Traits Could Experience…
May 12, 2017
It wasn’t too many years ago that ag retailers and their grower-customers could hardly wait for new options to fight Read More
Diane Allemang and Dan Jacobs
Crop InputsFMC Agricultural Solutions, Casa Pacifica Partner to He…
May 11, 2017
FMC Agricultural Solutions is teaming up with Casa Pacifica Centers for Children and Families, an organization that supports vulnerable children Read More
UncategorizedWhat’s Up With ARA
May 11, 2017
CropLife Editor Eric Sfiligoj talks with Brian Reuwee regarding what issues are on the docket for the Agricultural Retailers Association. Read More
BASF Maglis tablet retailer grower
Precision AgQ&A: What BASF’s Latest Foray into Precision …
May 11, 2017
In late April, BASF agreed to acquire U.S. precision ag player ZedX, a leader in the development of agronomic weather, Read More
Pam Marrone
Crop InputsMarrone Bio Innovations Enters into Distribution Agreem…
May 11, 2017
Marrone Bio Innovations, Inc., a leading global provider of bio-based pest management and plant health products for the agriculture markets, Read More
Bayer
Crop InputsBayer to Sell Liberty Business to Seal Monsanto Deal
May 8, 2017
Bayer has agreed to sell its Liberty herbicide and LibertyLink-branded seeds businesses to win antitrust approval for its acquisition of Read More
Trump, Senate, Cabinet
LegislationTrump’s EPA Appointee Dismisses Half of Major Sci…
May 8, 2017
(Via NYTimes.com) EPA has dismissed at least five members of a major scientific review board, the latest signal of what Read More
Winter Wheat
FungicidesREGALIA Rx Available from Koch Agronomic Services for 2…
May 8, 2017
Koch Agronomic Services, LLC has announced that REGALIA Rx biofungicide is available for U.S. corn, wheat and soybean growers who Read More