Heat, Drought Lead To Ear Rot Potential In Corn

Heat and drought in the Corn Belt have created the perfect conditions for Aspergillus ear rot to develop in corn grain and silage – something Purdue Extension plant pathologists say grain and livestock producers need to prepare for.

The disease is caused by a fungus that produces aflatoxin, a toxic carcinogen for livestock that consume contaminated grain or silage.

Aspergillus ear rot normally shows up near the end of the corn growing season as the crop reaches the dent phase. Growers can identify the disease by peeling back the husks and looking for stunted ears with an olive-green dusty mold.

“This year presents a unique challenge for producers since corn may be cut for silage and many fields have poorly pollinated plants and limited kernel set,” Kiersten Wise said. “Growers have asked questions about assessing the potential for Aspergillus ear rot and aflatoxin to occur in these fields.”

The fungus that causes ear rot needs kernels on an ear to develop. Without ears or kernels, Aspergillus ear rot and aflatoxin won’t be a problem.

If ears with kernels are present in a field, Wise said it’s important to determine if aflatoxin is present. Both corn silage and grain can be submitted for analysis by a professional laboratory, such as Purdue’s Animal Disease Diagnostic Laboratory.

The USDA has set thresholds for the amount of aflatoxin tolerated in grain, depending on the end use. According to Charles Woloshuk, those restrictions are especially tight for the dairy industry.

“Aflatoxins are of concern to dairy producers in particular because the Federal Drug Administration regulations require aflatoxin residues in milk to be less than 0.5 parts per billion,” he said. “To prevent the carryover of aflatoxins into milk, silage and other feed components should not contain greater than 20 parts per billion.”

Other restrictions are:

  • Corn for animal feed or human consumption: 20 parts per billion.
  • Corn grain for breeding cattle, swine and mature poultry: 100 parts per billion.
  • Corn grain for finishing swine of 100 pounds or more: 200 parts per billion.
  • Corn grain for finishing beef cattle: 300 parts per billion.

The bad news for both grain and livestock producers is that at this point in the season there is little they can do to manage Aspergillus ear rot or aflatoxin. The best they can do now, according to Wise, is scout prior to harvest and determine if there is a problem and, if so, its severity.

“If any Aspergillus ear rot is observed in a field, affected areas should be harvested early and grain segregated to avoid aflatoxin contamination of non-infected grain,” she said. “Grain harvested with suspected Aspergillus ear rot should be dried to below 15% moisture.”

Aflatoxin can continue to accumulate in grain or silage with kernels kept above 15% moisture.

“All grain contaminated by ear rot fungus should be stored separately from good grain and stored below 13% moisture to prevent further growth of fungi,” Wise said.

More information about this disease is available in a free Purdue Extension publication, “Diseases of Corn: Aspergillus Ear Rot,” available here.

Topics:

Leave a Reply

Fungicides Stories
FungicidesSudden Death Syndrome, Brown Stem Rot Reported In Indiana Soybeans
September 3, 2014
Farmers and retailers should be watching for symptoms of these two diseases over the next few weeks as they are best managed through preventative methods. Read More
FungicidesResearchers Target Soybean Disease With Genetic Resistance Study
August 6, 2014
University of Illinois researchers will share new information on controlling sudden death syndrome through genetic resistance at this year's Agronomy Day. Read More
Soybean field
FungicidesValent Launches New Seed Protection Fungicide For Soybeans
July 16, 2014
The INTEGO SUITE System contains the first new, novel seed protection fungicide chemistry registered in 30 years by the EPA for protection against Pythium and Phytophthora. Read More
FungicidesNew Players May Make Pest Headlines In Corn, Soybean
April 1, 2014
The usual insects and diseases took a bit of a break in 2013, but other culprits surfaced — and could return. Read More
Top 100 Articles
Milan Kucerak, president/CEO, West Central
CropLife 100West Central Cooperative And Its New President Are A Match Made In Deviation
June 29, 2015
To appreciate just how unique West Central Cooperative is in the world of ag retail, an observer need only consider Read More
Winter Wheat
CropLife 100South Dakota Co-op Member Owners Vote No On Unification
June 26, 2015
The Boards of Directors for North Central Farmers Elevator (NCFE) and Wheat Growers (WG) have announced that member-owners have voted Read More
CropLife 100The Andersons Acquires South Dakota Plant Nutrient Manufacturer Kay-Flo
May 20, 2015
The Andersons, Inc., ranked No. 22 on the CropLife 100, has purchased Kay Flo Industries of North Sioux City, SD. “This Read More
CropLife 100AgGateway’s Barcoding Initiative Progressing Nicely
May 8, 2015
According to legend (or Wikipedia), the first step towards modern bar codes came back in 1948, when Bernard Silver, a Read More
CropLife 100Pinnacle Agriculture Acquires Minnesota Retailer
April 14, 2015
Pinnacle Agriculture Holdings, LLC, ranked No. 6 on the CropLife 100,  has successfully acquired Liebl Ag, LLC in Ada, MN.  Read More
CropLife 100CHS, Aurora Cooperative Complete Fertilizer Storage, Grain Shuttle Loading Facility
April 13, 2015
CHS Inc., the nation’s leading cooperative and ranked No. 5 on the CropLife 100, and Aurora Cooperative (ranked No. 21) Read More
Latest News
Measuring Bulk Tanks
ManagementBulk Pesticide Compliance: Top 10 Areas Of Improvement …
July 1, 2015
  In honor of the 33-year run of David Letterman’s Late Show, the American Agronomic Stewardship Alliance (AASA) is happy Read More
Industry NewsArysta North America Hires Midwest Sales Manager
July 1, 2015
Arysta LifeScience North America recently announced the hiring of Brian Battles as the Senior Technical Sales Manager for the Midwest Read More
Farmer on tablet
Eric SfiligojThe Never-Ending Battle Against Modern Agriculture
July 1, 2015
In the world of comic books, the character of Superman often refers to the fight to save the world as Read More
Retail FacilitiesBuilding Up Ag Retail
July 1, 2015
In the oftentimes unpredictable world we live in, it’s nice to know some things can be reliably countered on to Read More
Retail FacilitiesMaple River Grain And Agronomy Phases In Site Developme…
July 1, 2015
Marcus Construction helped Maple River Grain and Agronomy in Casselton, ND, with the design-build of its dry fertilizer, liquid chemical/seed Read More
Retail FacilitiesA&B Welding Builds A New Liquid Terminal Hub For Br…
July 1, 2015
To build its new hub facility, Briggs Crop Nutrients enlisted the help of A&B Welding. The result, an efficient facility Read More
Edon Farmers Co-op
Retail FacilitiesNew Marcus Facility At Edon Farmers Co-op Provides More…
July 1, 2015
Edon Farmers Co-Op in Edon, OH, needed a new facility to consolidate outdated locations. Marcus Construction was able to design Read More
Retail FacilitiesKinder Morgan Expands Its Storage With A New Dome Barre…
July 1, 2015
Kinder Morgan wanted additional covered storage at its Dakota Bulk Terminal on the Mississippi River in St. Paul, MN. With Read More
Retail FacilitiesHeartland Tank Protects Fertilizer From Extreme Cold At…
July 1, 2015
The Arthur Companies in Harvey, ND, enlisted the help of Heartland Tank Companies to develop a new liquid fertilizer facility Read More
The McGregor Co. fertilizer loadout
Retail FacilitiesThe McGregor Co. Partners With Kahler Automation To Cre…
June 30, 2015
Kahler Automation helped The McGregor Co. expand its Clarkston, WA, operation with unstaffed loadout technology that enables customers to pick Read More
Dry and Liquid Plant
Retail FacilitiesKahler Automation Helps CHS Dakota Ag Cooperative Build…
June 30, 2015
CHS Dakota Ag Cooperative in Mooreton, ND, wanted a liquid/dry blender system that could meet the needs of its customers Read More
Crop InputsLand O’Lakes, United Suppliers To Merge Crop Inpu…
June 29, 2015
Land O’Lakes, Inc. and United Suppliers, Inc. of Ames, IA, today announced their intent to merge their crop inputs businesses. Read More
FungicidesHelena To Distribute Unique Summit Agro Fungicide
June 29, 2015
RANMAN 400 SC fungicide, the only fungicide with a FRAC group 21 designation, is now part of the innovative Summit Read More
Eric SfiligojIARC Targets 2,4-D In Latest Report
June 29, 2015
The International Agency for Research on Cancer (IARC) has struck again. Earlier this year in March, this agency of the Read More
Milan Kucerak, president/CEO, West Central
CropLife 100West Central Cooperative And Its New President Are A Ma…
June 29, 2015
To appreciate just how unique West Central Cooperative is in the world of ag retail, an observer need only consider Read More
EquipmentCase IH Launches New Precision Air 5 Series Carts
June 29, 2015
Case IH recently introduced its new Precision Air 5 series air carts, developed to get the most from every plant’s 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