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

Crop InputsBayer Contests EPA’s Decision On Valuable Insecticide For Farmers
February 5, 2016
Crop Science, a division of Bayer, has announced it has refused a request by the Environmental Protection Agency (EPA) to Read More
Crop InputsBayer To Contest EPA Flubendiamide Decision
February 5, 2016
Crop Science, a division of Bayer, announced today it has refused a request by EPA to voluntarily cancel the uses Read More
FMC Capture LFR Insecticide VGR Soil Amendment
InsecticidesFMC Launches Capture LFR Insecticide Plus VGR Soil Amendment
January 28, 2016
FMC is launching Capture LFR Insecticide together with VGR Soil Amendment for in-furrow application in corn. This new co-pack delivers Read More
Corn close up
InsecticidesInsecticides 2016: Out With The Old, In With The New Reality
January 8, 2016
It isn’t so much that U.S. growers will have to decide among the abundant, groundbreaking new insecticides to use in Read More
Top 100 Articles
Elburn Cooperative
CropLife 100Elburn Cooperative Members Vote To Join CHS
December 28, 2015
With 81% of eligible producers voting, 94% cast an affirmative ballot for Elburn Cooperative, a diversified agricultural retailer based out Read More
West Central Cooperative, Jefferson, IA
CropLife 100Farmers Cooperative-West Central Merger Approved
December 21, 2015
The members of Farmers Cooperative Co. (FC), Ames, IA, and West Central Cooperative, Ralston, IA, have both approved the merger Read More
Wheat Growers Innovation Center, Bath, SD
CropLife 100Wheat Growers Opens Innovation Center
December 21, 2015
Wheat Growers’ commitment in providing its farmer-owners with the latest in technological advancements now has a one-of-a-kind focal point, as Read More
CropLife 100ARA Selects The Andersons As 2015 Retailer Of The Year
December 9, 2015
The Agricultural Retailers Association today named Maumee, OH-based The Andersons as its Retailer of the Year for 2015. The award Read More
CPS Washington Court House John Deere Sprayer
CropLife 100Application Equipment Report: It Is Easy Being Green For Top 100 Ag Retailers
December 5, 2015
On The Muppets television show, Kermit the Frog is famous for singing a song about the troubles he encounters in Read More
Fertilizer Bin
CropLife 100Fertilizer Sales: Another Down Year For Top 100 Ag Retailers
December 4, 2015
In pure number terms, the fertilizer category still dominates all crop inputs/services among CropLife 100 ag retailers. In 2015, for Read More
Latest News
Crop InputsBayer Contests EPA’s Decision On Valuable Insecticide F…
February 5, 2016
Crop Science, a division of Bayer, has announced it has refused a request by the Environmental Protection Agency (EPA) to Read More
Wheat Field North Dakota
Seed/BiotechSyngenta Wins Seed Fraud Suit Against South Dakota Grow…
February 5, 2016
Syngenta has obtained a $25,000 settlement from Paul and John Mayclin, Mayclin Farms, Plankinton, SD, in response to their Plant Read More
ManagementOABA Annual Conference Wraps Up In Columbus
February 5, 2016
More than 300 Ohio AgriBusiness Association (OABA) members and industry professionals were on hand to engage in collaborative learning and Read More
Crop InputsBayer To Contest EPA Flubendiamide Decision
February 5, 2016
Crop Science, a division of Bayer, announced today it has refused a request by EPA to voluntarily cancel the uses Read More
Syngenta
Seed/BiotechNot So Fast: ChemChina Syngenta Takeover Could Draw Nat…
February 5, 2016
State-owned China National Chemical Corp. (ChemChina), which plans to buy Swiss seeds and pesticide maker Syngenta, will promptly start preparations Read More
Rendering of Syngenta Seedcare Institute expansion
Seed/BiotechExpansion Of Syngenta’s North America Seedcare In…
February 4, 2016
As demand for seed treatment knowledge and products grows among farmers, retailers and others in the seed industry, Syngenta is Read More
Soybean Field
Industry NewsArysta LifeScience Strengthens Sales Team
February 4, 2016
Arysta LifeScience North America recently announced three new personnel additions: Jake Cook and Peter White are Territory Sales Managers for Read More
Davor Pisk Syngenta COO
Crop InputsSyngenta COO: Why ChemChina Offer Beat Monsanto’s
February 4, 2016
Syngenta Chief Operating Officer Davor Pisk says he is confident the proposed acquisition by ChemChina will ultimately help preserve choice Read More
Young corn plants in soil
Crop InputsKoch Biological Solutions Invests In Pathway Biologic
February 4, 2016
An affiliate of Koch Biological Solutions, LLC has acquired a minority equity position in, and entered into collaboration with, Pathway Read More
Crop InputsABG: China Signs Off On Monsanto’s Roundup Ready …
February 3, 2016
Monsanto Co. on Wednesday announced it plans to launch its Roundup Ready 2 Xtend soybeans in time for the 2016 Read More
Syngenta headquarters in Basel, Switzerland
Crop Inputs6 Things To Know About The ChemChina-Syngenta Deal
February 3, 2016
After months of rumors and speculation, Syngenta has announced that ChemChina has offered to acquire the Swiss-based company. “In making Read More
FertilizerPhosphorus: Is Band Or Broadcast Application The Better…
February 3, 2016
Is band or broadcast application the better method when it comes to phosphorus? The answer to this question depends mostly Read More
Syngenta Sign
Crop InputsChemChina Nearing Deal To Buy Syngenta For Record $43 B…
February 3, 2016
China National Chemical Corp. is nearing an agreement to buy Swiss pesticide-and-seeds-maker Syngenta AG for about 43.7 billion francs ($42.8 Read More
Herbicides2015 ASA Trials Demonstrate Valent Fierce XLT Herbicide…
February 2, 2016
Valent U.S.A. today announced that new Fierce XLT Soybean Herbicide ranks in the top tier among growers for length of Read More
Crop Protection Products in storage
Paul SchrimpfCrop Input Selling: Return Of The Price List
February 2, 2016
It was a good 15 years ago, shortly after I first started writing for this esteemed publication, that it all Read More
Potash storage at Growmark
FertilizerThe Phosphate And Potash Outlook For 2016
February 2, 2016
Like other commodities, prices of the leading plant nutrient products dropped sharply in 2015. At this writing, the price of Read More
Chesapeake Bay
StewardshipKeeping A Watch On Water Issues
February 2, 2016
During a down cycle in the market, it’s difficult to think about investing for the long term. For retail businesses, Read More
Young Corn Plants
FertilizerNutrient Considerations For Low Corn Prices
February 2, 2016
Corn prices are low and many producers are asking tough questions about their nutrient management programs. Here are some suggestions Read More