Extended Spring Weather Brings Armyworm Aplenty To Indiana

Mild March temperatures extended the spring season and brought armyworm moths to Indiana in populations not so abundant since 2001 – a year entomologists dubbed “The Year of the Armyworm.”

Purdue Extension’s black light trapping network has been finding substantial populations of the insect, especially in the northeastern part of the state. While this isn’t necessarily a disastrous scenario, Purdue Extension entomologist John Obermeyer said corn growers need to be out scouting their at-risk fields.

“Though most of the armyworm moths are blown here from the southwestern states, a percentage will overwinter in the Midwest if winters are mild,” he said. “We know that moths have been active before our Apr. 17 start date of the black light traps.”

Obermeyer said it’s impossible at this point to know how many armyworm moths are present or how active they have been in Indiana. But based on when moths were first seen flying in the state, he said it’s likely that moths not only are actively mating and laying eggs, but there probably are larvae up to three-quarters inches feeding on Indiana corn, wheat, grass hay and grass cover crops.

“Corn that has been no-tilled into a grass cover crop, especially annual rye, should be inspected immediately for armyworm feeding,” Obermeyer said. “We’ve been made aware of some wheat fields being converted to corn because of freeze damage, and these, too, should be considered high-risk.

“Hatched larvae will move from the dying grasses to emerging or emerged corn.”

Armyworm feeding will give corn a “ragged” appearance, and the damage will extend from the leaf margin toward the midrib. There are no other insects this time of year that will display the same feeding damage that armyworm will, Obermeyer said.

“Depending on the population, most of the plant can be consumed,” he said.

Because armyworm feed only at night, Obermeyer said finding the insect during scouting can be a challenge. In wheat, growers should concentrate on areas of dense growth. They also should inspect for notching on the leaves once flag leaves have unfurled. Growers also can carefully uncover crop residues or soil clods to look for curled-up larvae.

With abundant moths and eggs and larvae already in fields, Obermeyer said farmers need to be diligent about monitoring their fields multiple times. While some Bt hybrids might resist armyworm, the insect still can cause significant damage before plant proteins can reduce feeding.

He also noted that seed-applied insecticides will not control armyworm, regardless of application rate.

“In short, there is no in-plant or on-seed solution that will allow you to avoid scouting on this one,” Obermeyer said. “Remember, once armyworms get to an inch or more in length, they eat a tremendous amount of foliage in a short period of time and become harder to kill. Some areas of fields seem to disappear overnight.

“Sweet dreams and happy scouting!”

Growers can follow the Black Light Trap Report via Purdue Extension’s Pest and Crop Newsletter.

Leave a Reply

Insecticides Stories

Soybean Field
InsecticidesDiflumax 2L Insect Growth Regulator Receives EPA Section 3 Registration
September 8, 2016
HELM AGRO US, Inc. has announced the EPA Section 3 registration of its new Diflumax 2L Insecticide/Miticide. Containing the active Read More
Soybean Field
InsecticidesZeal SC Miticide Now Registered For Soybeans
August 9, 2016
Valent U.S.A. Corp. has announced the EPA registration of Zeal SC Miticide for soybeans. Zeal is a proven residual miticide Read More
Syngenta plant
InsecticidesGrowers, Distributors May Use Remaining Stocks Of Belt Insecticide
August 1, 2016
The U.S. EPA’s Environmental Appeals Board (EAB) has upheld an earlier EPA decision to cancel registration for Bayer’s insecticide flubendiamide, 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
Trending Articles
Corn Field
Eric SfiligojFacing Ag Industry Challenges
September 26, 2016
At the 2016 annual Mid America CropLife Association (MACA) meeting in September, a pair of crop protection company representatives discussed Read More
Bayer Monsanto
Crop InputsBayer-Monsanto Mega-Merger: 6 Things You Need To Know
September 14, 2016
Mega mergers have become almost routine in the agricultural industry. Right on the heels of Monday’s news that fertilizer giants Potash Read More
Potash Corp Agrium
Crop InputsAgrium, Potash Corp To Merge To Create $36 Billion Company
September 12, 2016
Canada’s Agrium Inc. and Potash Corp of Saskatchewan Inc. have agreed to combine in a deal that would create a Read More
Osage Co-op Elevator Osage, IA Finished Building
OpinionAre We Crazy?
September 8, 2016
At some point in the first few months of my employment here at CropLife® magazine, I started getting curious about Read More
ManagementMAGIE 2016 Highlights and Deere Anti-Trust
September 1, 2016
CropLife Editor Eric Sfiligoj discusses the recent Midwest AG Industries Exposition and the Department of Justice’s objection to John Deere Read More
ASMARK 2016 Retailers Live! Tour - CPS
CropLife 100CPS Acquires Texas Retail Operation
August 23, 2016
Crop Production Services (CPS) has acquired the assets of Larry’s Chemical and Spray, Inc., for an undisclosed amount in an Read More
Latest News
CHS St. Paul, MN fertilizer terminal
CropLife 100Farmers Union Oil Co. Votes To Join CHS
September 30, 2016
Eligible voting members of Farmers Union Oil Co., a diversified agricultural retailer based out of Oslo, MN, have cast affirmative Read More
EmployeesOABA Program Develops Future Generation Of Agribusiness…
September 29, 2016
The Ohio AgriBusiness Association will select up to 25 promising leaders to participate in a leadership enhancement program early next Read More
ManagementThoughts on CropLife America and the PSM Appeal
September 29, 2016
Editors Paul Schrimpf and Eric Sfiligoj talk about the recent CropLife America annual meeting and the successful appeal of the Read More
Corn Field
Industry NewsMarrone Bio Innovations’ SVP And Chief Sustainability O…
September 29, 2016
Marrone Bio Innovations, Inc., a leading provider of effective and environmentally responsible pest management and plant health products, announced today Read More
Young Corn Field
StewardshipStudy: Ohio Farmers Doing ‘A Good Job Of Managing…
September 27, 2016
Leaders from Ohio’s largest grain farming organizations announced today that Ohio farmers are doing their part in effectively managing phosphorus Read More
Growmark FS Outlet
Industry NewsGROWMARK To Purchase Suncor’s Share Of UPI
September 26, 2016
GROWMARK and Suncor have reached an agreement in which GROWMARK will purchase Suncor’s 50% interest in UPI, Inc. in Ontario, Read More
Corn Field
Eric SfiligojFacing Ag Industry Challenges
September 26, 2016
At the 2016 annual Mid America CropLife Association (MACA) meeting in September, a pair of crop protection company representatives discussed Read More
Syngenta Seedcare Institute
Seed/BiotechSyngenta Opens New North America Seedcare Institute In …
September 23, 2016
Syngenta unveiled its new Seedcare Institute in Stanton, MN, during a recent grand opening celebration. More than 150 industry leaders, Read More
StewardshipMonsanto Invests $1.6 Million In System To Quantify Gre…
September 23, 2016
The USDA – Natural Resources Conservation Service (USDA-NRCS) recently awarded the National Corn Growers Association (NCGA) and its Soil Health Read More
Pipe rack
LegislationCourt Sides With Ag Retailers On PSM
September 23, 2016
The D.C. Court of Appeals has ruled the Occupational Safety and Health Administration violated the Occupational Safety and Health Act when Read More
ManagementPacific Coast Fertilizer Announces Interest In Longview…
September 22, 2016
Pacific Coast Fertilizer LP (PCF) announced at the Cowlitz Economic Development Council board of directors meeting its interest in developing Read More
Young corn plants in soil
UncategorizedCool Planet Raises Additional $9 Million To Commerciali…
September 22, 2016
Cool Planet has announced the first close of a new financing round to commercialize the company’s Cool Terra Engineered Biocarbon Read More
Crop InputsJim Loar Promoted To President And CEO Of Cool Planet
September 22, 2016
In a move that reflects and reinforces the company’s commitment to the agricultural market, the Cool Planet board of directors Read More
BlendersNorth Dakota Coop Debuts Dry Fertilizer Plant
September 22, 2016
North Central Grain Cooperative has begun operations at a new dry fertilizer plant at its Rolla, ND, site. It is Read More
Crop InputsMonsanto, Bayer Officials Defend Proposed $66 Billion M…
September 21, 2016
Top officials for Monsanto and Bayer defended their proposed $66 billion merger before skeptical senators on Tuesday, insisting that the Read More
ManagementUpcoming Shows & Recent Events
September 19, 2016
Editors Paul Schrimpf and Eric Sfiligoj talk about upcoming trade shows and events and review the Mid America CropLife Association Read More
Industry NewsVerdesian Life Sciences Appoints New CEO
September 19, 2016
Verdesian Life Sciences, a plant health and nutrition company, today announced that its board of directors has named Kenneth M. Avery Read More
Corn
Crop InputsEPA Settles With Syngenta For Alleged Multi-Regional Pe…
September 19, 2016
The U.S. EPA has announced a multi-region settlement with Syngenta Crop Protection, LLC (Syngenta) in Greensboro, NC, for alleged violations of Read More