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
FFA at Monsanto Booth at the 2015 National Farm Machinery Show
Industry NewsFive Students Receive The 2015 Monty’s Plant Food Compa…
July 29, 2015
This fall, five college-bound students will have financial support through the Monty’s Plant Food Company FFA Scholarship. All five scholarship Read More
Crop InputsBeneficial Reuse Management Launches Pelletized Gypsum …
July 29, 2015
Beneficial Reuse Management (BRM) announced this week at Ag Media Summit that its GYPSOIL Pelletized Products Division will open a Read More
StewardshipOhio Water Quality Project To Determine How Much Phosph…
July 27, 2015
Researchers with the College of Food, Agricultural, and Environmental Sciences at The Ohio State University are looking for farmers in Read More
FertilizerKoch Agronomic Services Launches N-TEGRATION Technology
July 27, 2015
Koch Agronomic Services, LLC (KAS) has launched  N-TEGRATION Technology, a process technology platform designed to enable production of enhanced efficiency fertilizers at Read More
HerbicidesExpert: IARC Herbicide Classifications Leading To Confu…
July 24, 2015
Few people in the crop protection industry had heard of the International Agency for Research on Cancer (IARC) before this Read More
ManagementFCI Trade Summit Update & Precision Tank Turns 50
July 23, 2015
Editors Dave Frabotta and Eric Sfiligoj discuss the upcoming FCI Trade Summit in Las Vegas, NV, and how Precision Tank Read More
Palmer pigweed seedhead in cotton
HerbicidesUSDA Deregulates Dow AgroSciences’ Enlist Cotton Trait
July 23, 2015
The USDA today issued its decision deregulating Dow AgroSciences’ Enlist cotton trait in the U.S. The USDA has now completed its Read More
Industry NewsVerdesian Life Sciences Showcases Versatile Product Por…
July 23, 2015
Technology has revolutionized agriculture by bringing farmers, retailers and distributors to the forefront of the digital age. To meet the Read More
FertilizerWSJ: Cf Industries Exploring Merger With Dutch Chemical…
July 23, 2015
U.S. fertilizer maker CF Industries is in advanced merger talks with Amsterdam-listed chemical company OCI NV, the Wall Street Journal Read More
HerbicidesNufarm Releases New Panther SC Herbicide
July 23, 2015
Nufarm has announced the availability of new Panther SC herbicide. Panther SC is the first liquid formulation of flumioxazin available Read More
EquipmentFarmLink Launches Farm Equipment Sharing Program
July 23, 2015
FarmLink has introduced a new online farm equipment sharing community – MachineryLink Sharing – leveraging this new economy business model Read More
HerbicidesCould The South’s Most Troublesome Weed Represent A Thr…
July 22, 2015
Palmer amaranth is undoubtedly the most troublesome weed in the southern United States, taking a devastating toll on both cotton Read More
Industry NewsH.J. Baker Hires New Director Of International Sales
July 22, 2015
Global Agriculture firm H.J. Baker announced today that Steve Langley has joined the company’s Crop Performance Division and Animal Health Read More
InsecticidesSyngenta Recommends Soybean Scouting To Prevent Economi…
July 22, 2015
Proper soybean insect pest control begins with scouting. As the warm weather continues, Syngenta encourages growers to implement a scouting Read More
Crop InputsH.J. Baker Launches Fall Sulphur Campaign
July 22, 2015
H.J. Baker has launched their “Keep Your Future Green – Use Tiger This Fall and Win Big” campaign. The campaign Read More
Central Valley Ag Randolph, NE
Retail FacilitiesStueve Construction Builds Fifth Facility For Central V…
July 21, 2015
Central Valley Ag partnered with Stueve Construction Co. to successfully design and build its Monroe, Oakland, Wakefield and Royal hub facilities Read More
FertilizerNew Research Could Lead To Less Reliance On Nitrogen, E…
July 21, 2015
Farmers often are required to apply nitrogen fertilizers to their crops to maintain quality and improve yields. Worldwide, farmers used Read More
Seed/BiotechMonsanto Targets Farmers, AFBF In Syngenta Takeover
July 21, 2015
As Monsanto Co. struggles to convince rival Syngenta AG to discuss a potential merger, the seed and agrochemical giant is Read More