Severe Rootworm Injury To Bt Hybrids In First-Year Corn Confirmed

Corn rootworm lodging

Significant Western corn rootworm larval injury in first-year cornfields has been confirmed in Livingston and Kankakee counties in Illinois, according to Michael Gray, a professor of entomology at the University of Illinois Department of Crop Sciences.

On August 26, Gray and Joe Spencer, an entomologist with the Illinois Natural History Survey, confirmed injury to rotated cornfields that had been planted to Bt rootworm hybrids (VT Triple PRO RIB — expresses the Cry3Bb1 protein). The fields in question were brought to their attention by Bryan Johnston of Cabery Fertilizer in Cabery, IL.

“Bryan indicated that many first-year Bt cornfields in the area had severe root pruning and lodging,” Gray said. “The fact that rotated corn is now showing susceptibility to rootworm damage, even when planted to certain Bt hybrids, is evidence that crop rotation in central and east central Illinois does not adequately confer a consistent level of root protection.”

Spencer collected numerous adult Western corn rootworms in the damaged corn and adjacent soybean fields.

“The number of beetles in the soybean fields was reminiscent of densities in the late 1990s and early 2000s — very impressive,” Gray noted. “The density of Western corn rootworm adults in both crops, along with the severe pruning and lodging, was additional evidence that the Bt hybrids (VT Triple PRO RIB) had failed to offer the necessary root protection.”

Bioassays on the offspring from the adults collected by Spencer will be required to determine if these rotation-resistant Western corn rootworms are also resistant to the Cry3Bb1 protein. If the bioassays confirm resistance to the Cry3Bb1 protein, Gray said producers across a wide swath of Illinois will have a “formidable insect foe,” capable of overcoming both crop rotation and at least one Bt protein (Cry3Bb1).

Gray is encouraging producers across east central and central Illinois to look for corn rootworm injury in their first-year cornfields.

“From the roadside, it is very easy to overlook areas of fields that may be lodged,” he said. “I suspect that during harvest, many producers may be surprised to see pockets within fields that have been severely damaged by corn rootworms. Looking ahead, now is the time to begin thinking about how to best protect against corn rootworm damage in 2014.”

Producers in the most severely affected areas (central and east central) of Illinois should consider the use of pyramided Bt hybrids (hybrids expressing more than one rootworm Cry protein) in 2014, Gray recommended.

“The use of a planting-time soil insecticide should not be needed with a pyramided Bt rootworm hybrid,” he said. “Producers who elect to plant Bt hybrids expressing only a single Cry rootworm protein may choose to use a planting-time soil insecticide as an added precaution, particularly in areas where single-traited Bt hybrids (VT Triple PRO) have failed this season.”

Leave a Reply

Insecticides Stories

InsecticidesSyngenta Recommends Soybean Scouting To Prevent Economic Loss From Insects
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
InsecticidesVestaron Biopesticide Approved In California
June 29, 2015
Vestaron Corporation, a developer of insect control products derived from naturally occurring peptides, today announced that its VST-006330-EP biopesticide has received Read More
InsecticidesValent’s Zeal SC Miticide Receives EPA Approval
June 29, 2015
Valent U.S.A. Corporation announced today that Zeal SC Miticide has been registered by EPA with a new liquid formulation that Read More
Tim Hassinger Dow AgroSciences President and CEO
Crop InputsDow Details Molecular Forensic Technology For Insecticides
June 10, 2015
Just like each human fingerprint is unique; microbes that have been developed to produce naturally based crop protection products are Read More
Top 100 Articles
Crop InputsLand ‘O Lakes, United Suppliers Finalize Merger
August 24, 2015
According to a press release on August 24, owners of United Suppliers, Inc. and members of Land O’Lakes, Inc. “have Read More
West Central Cooperative, Jefferson, IA
CropLife 100Iowa Cooperatives To Explore Unification
August 19, 2015
The boards of directors at two of Iowa’s leading farmer-owned cooperatives yesterday signed a letter of intent to study the Read More
CropLife 100Southern States Coop Hosting Drone Flight This Friday
August 3, 2015
Southern States Cooperative — No. 9 on the CropLife 100 — is hosting an FAA-approved drone demonstration at Grandview Farms Read More
CropLife 100Aligned Ag Distributors Adds Four New Owners
July 30, 2015
Aligned Ag Distributors LLC has announced the addition of four new customer/owners to Franklin Holding Co. LLC. They are: The Read More
CropLife 100Pinnacle Purchases California-Based Specialty Crops Retailer
July 20, 2015
Pinnacle Agriculture Holdings has successfully acquired California-based NH3 Service Co.  Operating as part of Pinnacle’s Performance Agriculture brand, the new locations Read More
Asmus Farm Supply liquid fertilizer facility features 20,000 square feet
CropLife 100Slideshow: Asmus Farm Supply Shows Off Its New Liquid Fertilizer Facility
July 15, 2015
Asmus Farm Supply, Rake, IA, recently added a new liquid fertilizer facility to its company operations. The new liquid fertilizer Read More
Latest News
StewardshipBee Buffer Strip Initiative Seeks 100 Ohio Farmers
August 31, 2015
The U.S. Bee Buffer Project, an initiative of the Pollinator Partnership (P2), Burt’s Bees and The Burt’s Bees Greater Good Read More
2015 ShowStopper Award, MAGIE
EquipmentA ShowStopper From Case IH: The Patriot 2250
August 31, 2015
For nine years now, visitors to the yearly Midwest AG Industries Exposition (MAGIE) show have been tasked with not only Read More
Crop InputsMonsanto, FMC Expand Roundup Ready PLUS Platform
August 31, 2015
FMC Corp. and Monsanto Co. announced today an expanded agreement to continue their participation in the Roundup Ready PLUS Crop Read More
Deere Nutrient Applicator
Eric SfiligojThe Good & Bad News From MAGIE
August 31, 2015
As I write this column, I’ve just returned from the annual Midwest AG Industries (MAGIE) trade show in Bloomington, IL. Read More
CPS Morenci receiving its 4R certification
StewardshipCPS Morenci Becomes First Michigan Facility Certified I…
August 31, 2015
The 4R Nutrient Stewardship Certification Program has announced that Crop Production Services, Inc.’s facility located in Morenci, MI, has been Read More
EquipmentDeere Announces Soucy Track Distribution Alliance
August 28, 2015
John Deere announces an alliance with Soucy Track to sell and distribute products through the John Deere dealer channel. “This Read More
FertilizerFall-Applied Phosphorus: A Rooted Investment
August 28, 2015
As commodity prices decrease and input prices continue to rise, farmers are seeking more efficient strategies for meeting a high Read More
Monsanto Sign
Crop InputsWhat’s Next For Monsanto, Syngenta?
August 28, 2015
After dropping its $47 billion bid to take over Swiss agribusiness firm Syngenta, Monsanto may be turning its focus to Read More
Golden Harvest Corn stalks
Crop InputsMonsanto: Syngenta Not The Only Horse In Crop Protectio…
August 28, 2015
Monsanto Co, having ditched an audacious $46 billion (£30 billion) offer for Syngenta AG, may downshift to a humbler strategy Read More
ManagementConsolidation hits and a miss; And a look at China’s ch…
August 28, 2015
As Monsanto suspends its pursuit of Syngenta, consolidation news at the retail and distribution level heats up. CropLife magazine’s Executive Read More
Corn Field
MicronutrientsHuma Gro Introduces New Boron Liquid Nutrient Formulati…
August 28, 2015
BORO-MAX, a new boron (B) 10% liquid nutrient formulation, has been added to the Huma Gro product line. This new Read More
Crop InputsNFU: Monsanto Decision To Withdraw Syngenta Bid ‘…
August 26, 2015
National Farmers Union (NFU) President Roger Johnson said the organization was very pleased by the news that Monsanto has withdrawn Read More
Crop InputsMonsanto Withdraws Bid For Syngenta
August 26, 2015
Monsanto Co. abandoned its latest effort to acquire Syngenta AG, the world’s top maker of pesticides, after a sweetened bid Read More
Syngenta Sign
Crop InputsSyngenta Comments On Monsanto Announcement
August 26, 2015
The Board of Syngenta confirms that it received a verbal proposal from Monsanto to acquire the company at a price Read More
Case IH Patriot 2250 Sprayer
EquipmentHigh-powered Case IH Patriot 2250 Sprayer Pushes Throug…
August 26, 2015
Engineered with more muscle, the new 660-gallon-capacity Patriot 2250 sprayer features best-in-class horsepower, along with the fuel efficiency that comes Read More
Crop InputsLand ‘O Lakes, United Suppliers Finalize Merger
August 24, 2015
According to a press release on August 24, owners of United Suppliers, Inc. and members of Land O’Lakes, Inc. “have Read More
TMX-2050 In-Cab Display Launch Run Screen
Eric SfiligojPrecision Ag Could Shine In Increased Spotlight On Agri…
August 24, 2015
By any measure, 2015 is turning into one of the most challenging years agriculture has ever experienced. All throughout good Read More
ManagementCrop Conditions In Minnesota and Traveling Time
August 21, 2015
Editors Paul Schrimpf and Eric Sfiilgoj discuss the crop outlook from a field trip to Minnesota and upcoming travel plans. Read More