5 Tips To Decide If Corn Needs Fungicide

The use of fungicides in corn has been a hot topic in recent years, pitting some manufacturers that tout the effectiveness of preventive applications vs. many Extension specialists’ concerns. For your grower-customers that did not choose a preventive fungicide application, now is the time of year when they need to decide if a fungicide should be applied, and a Purdue University expert offers five tips to help in the decision-making process.

“Deciding whether to apply a fungicide is not a straightforward question,” says Kiersten Wise, Purdue Extension field crops disease specialist. “There are several things that must be taken into consideration.”

University research from across the Midwest shows consistent yield advantages from a fungicide application occur when there is a significant amount of disease in a field, Wise says. “This is the time to get out there and scout and determine the amount of disease in the field,” she adds. “This will really help you decide if a fungicide application is justified.”

Her top tips on what to look for to determine if fungicide application is needed are:

1. Hybrid susceptibility. Hybrids vary in their susceptibility to foliar disease of corn, and hybrids susceptible to diseases such as gray leaf spot are at a greater risk of disease development than hybrids with moderate or high levels of resistance. “As far as limiting yield potential, gray leaf spot is the main disease we are concerned about,” Wise says. “However, if you see a little bit of gray leaf spot in the field when scouting, that doesn’t necessarily mean you need a fungicide application.”

2. Level of disease in the field. Growers should look through the entire field, consider the type of field and where the lesions are located on the plant. “Check to see if lesions are on the ear leaf or if the disease is on a few leaves below the ear leaf and determine the percentage of plants affected,” she says. “Fungicide application should be considered on fields where the hybrid is rated as susceptible or moderately susceptible and 50 percent or more of the plants display disease lesions on the third leaf below the ear and higher prior to tasseling.”

So far, Wise says she has seen gray leaf spot on lower leaves in some susceptible hybrids.

3. Previous crop and cropping system. When looking at the previous crop and cropping system, it’s important to remember that most fungal diseases, such as gray leaf spot, survive from year to year on crop residue. “Planting continuous corn or planting corn into high levels of corn residue with no-till will increase the likelihood for a disease to develop,” Wise says.

4. Late planting and if weather conditions are favorable for disease development. Late planting across much of Indiana, Illinois, and Ohio this spring means the crop is at increased risk of gray leaf spot development, according to research from Iowa State University. Favorable weather conditions for disease development of gray leaf spot are high humidity and moisture levels, as well as moderate to warm temperatures.

5. Pencil it out. Wise cautions growers to be careful in making the decision about whether to apply a fungicide and also include economics in the list of things to consider. “It’s an added cost, and with the price of corn right now, we need to make sure that the fungicide application will pay for itself,” she says.

Economic return depends on fungicide application costs, drying costs, and the price of corn. Wise says an increase of approximately 10 bushels per acre is needed to pay for the cost of fungicide application with corn priced at $3 per bushel and an application cost of about $30 per acre. As the price of corn increases, the additional amount of yield needed to pay for the fungicide application decreases.

So when corn is at $3.50 per bushel and application costs $30 per acre, a yield increase of about 8.5 bushels per acre is needed to pay for the cost of application. If corn reaches $4 per bushel, then a yield increase of about 7.5 bushels per acre is needed to cover application costs.

(Source: Purdue University)

Leave a Reply

Fungicides Stories

Soybean Field
FungicidesGrowers Report Yield Boost, Extended Residual Disease Control From Trivapro Fungicide
January 9, 2017
With the new growing season around the corner, it’s time to start thinking about inputs for 2017. As growers weigh Read More
Monsanto Bioag logo
FungicidesIsagro USA Named Exclusive Distributor For Taegro 2 Biofungicide In U.S., Canada
January 4, 2017
Isagro USA, Inc. has signed an agreement to exclusively distribute Taegro 2 Biofungicide in the U.S. and Canada. The BioAg Alliance Read More
Brown stem rot in soybeans
FungicidesTips For Managing 6 Serious Soybean Diseases
December 28, 2016
There’s no shortage of diseases waiting to descend on your soybean crop. No matter where you farm, managing disease requires Read More
FungicidesManaging Sudden Death Syndrome And Brown Stem Rot In Soybeans
December 28, 2016
Cool wet soils in spring can lead to increased chances for sudden death syndrome (SDS) or brown stem rot (BSR) Read More
Trending Articles
AgriSync
Matt Hopkins17 Agriculture Apps That Will Help You Farm Smarter In 2017
December 9, 2016
Ag professionals are working smarter, not harder, than ever before. Smart farming technologies have enabled them to reduce costs, maximize Read More
R4023 Sprayer, John Deere
CropLife 100Ag Retail Equipment Report: The Green Party Continues
December 7, 2016
In the annual race for sales in the ag retail equipment marketplace, the color schemes for participants are a little Read More
Mike Stern
Precision AgClimate Corp. CEO Talks Retailer Support For Digital Ag
December 1, 2016
CropLife Magazine’s sister publication, AgriBusiness Global, recently sat down with Mike Stern, CEO of The Climate Corp., following the Monsanto subsidiary’s Read More
Precision AgTrimble Debuts End-to-End FMIS Platform
November 28, 2016
October’s inaugural PrecisionAg Vision Conference left this author with many thoughts and things to ponder in the coming months. Probably Read More
CHS Primeland
CropLife 100The 2016 CropLife 100 Report: Reviewing The Many Bulls And Bears Impacting This Year’s Marketplace
November 28, 2016
For virtually all of 2016, the nation was wholly focused on the big Presidential election. Some folks aligned themselves with Read More
Monsanto sign
Crop InputsMissouri Governor Meets With Bayer CEO To Discuss Monsanto Merger
November 21, 2016
Missouri Gov. Jay Nixon visited Bayer AG global headquarters in Leverkusen, Germany, on November 18 to discuss the proposed Bayer-Monsanto Read More
Latest News
Eric SfiligojNo Alternative Facts: Dicamba Cropping System Applicato…
January 23, 2017
During President Donald Trump’s inauguration, much fuss was made over the use of the term “alternative facts” vs. some of Read More
Young Corn Plants
ManagementTimac Agro USA Acquires Michigan Ag Retailer
January 20, 2017
Timac Agro USA, an agriculture supply company specializing in high-efficiency plant and animal nutrition products, has acquired St. Louis,MI-based A&E Ag, Read More
Soybean field
Crop InputsNufarm Teams Up With John Deere Financial
January 19, 2017
Nufarm and John Deere Financial have teamed up to help farmers grow a better tomorrow. This program helps make purchases Read More
Sonny Perdue
LegislationTrump Formally Picks Perdue As Agriculture Secretary
January 19, 2017
U.S. President-elect Donald Trump officially announced Sonny Perdue as his choice for secretary of agriculture on Thursday, selecting a former Read More
ManagementPresident Trump, Wisconsin Review, and a Dow-DuPont Upd…
January 18, 2017
Editors Paul Schrimpf and Eric Sfiligoj reflect on a new administration, a recent winter show, and crop protection company mergers. Read More
Industry NewsBayer, MS Technologies Get China Approval For Balance G…
January 18, 2017
MS Technologies and Bayer have received import approval from China for Balance GT soybeans. The new Balance GT Soybean Performance Read More
Werner Baumann, Bayer AG, and Hugh Grant, Monsanto
Industry NewsReport: Monsanto, Bayer CEOs Among Latest to Make Trump…
January 18, 2017
The chief executive officers of German chemical giant Bayer AG and U.S. seed behemoth Monsanto, Werner Baumann and Hugh Grant, Read More
Giant Ragweed
HerbicidesStudy: Focusing On Weed Seedbank Can Help Manage Herbic…
January 18, 2017
Researchers writing in the latest issue of the journal Weed Science provide important insights on the control of herbicide-resistant giant Read More
Management3 Financial Trends To Watch In Agriculture
January 17, 2017
I recently had the opportunity to attend a meeting of credit managers for Midwest ag supply and input companies, in part Read More
Andersons Retail Store
CropLife 100The Andersons To Close All Retail Stores; Shutdown Does…
January 16, 2017
In a stunning announcement to the Toledo area, The Andersons Inc. said on Sunday that it would close its two Read More
Trimble TMX-2050 In-Cab Display
Eric SfiligojPrecision To Lead Agriculture In 2017?
January 16, 2017
Another new year is upon us! And I’m certain I speak for many in the agricultural world when I say Read More
Corn
Eric SfiligojThe Mood From Madison? In A Holding Pattern
January 16, 2017
Last week, I had the chance to attend the annual Wisconsin AgriBusiness Classic show in Madison, WI. It’s been a Read More
Syngenta Sign
Crop InputsAccenture Helps Syngenta Transform Its Global Logistics
January 13, 2017
Syngenta, a leading agriculture company, has collaborated with Accenture to design and implement a new digital logistics operating model across Read More
Fall Creek Seth Harden The Nature Conservancy
StewardshipLocal Farmers’ Watershed Initiative: Continuous Improve…
January 13, 2017
The goal in the Big Pine Watershed Project is to more intentionally do what local farmers and responsible ag retailers Read More
HerbicidesEPA Expands Enlist Duo Herbicide Registration To 34 Sta…
January 13, 2017
The U.S. EPA has expanded the geography for application of Enlist Duo herbicide from 15 to 34 states. This means Read More
Olson Ag Enterprise
CropLife 100Wilbur-Ellis Acquires Nebraska Seed Retailer
January 13, 2017
Wilbur-Ellis’ Agribusiness, a recognized leader in precision agriculture technology and the distribution and marketing of plant protection, seed and nutritional Read More
ManagementDeere-Precision Planting Update and the Ag Secretary Wa…
January 12, 2017
Editors Paul Schrimpf and Eric Sfiligoj provide the latest on the court date for John Deere/Precision Planting and the quest Read More
Monsanto sign
Seed/BiotechMonsanto, NRGene Form Agreement For Big Data Genomic An…
January 12, 2017
Monsanto Co. and NRGene have announced that the companies have reached a non-exclusive, multi-year global licensing agreement on NRGene’s genome-analysis Read More