How To Use Foliar Fungicides

Growers can see a yield increase of 3 bushels per acre when using foliar fungicides on soybean fields where foliar diseases are present. Experts at Pioneer Hi-Bred, a DuPont business, say foliar fungicides on soybeans typically show a positive yield response 75 percent of the time.

Pioneer agronomy research scientists conducted trials from 2004 to 2008 to evaluate the effects of foliar fungicide and fungicide/insecticide applications on soybean yield. Despite considerable variation in growing conditions across years and locations, the trials demonstrated a consistent positive yield response to treatments that included strobilurin fungicides (Headline® and Quadris®). These fungicides, when used alone, showed an increase of 3.3 bushels per acre. When the fungicide was combined with an insecticide treatment, the increase was 4.8 bushels per acre.

“If conditions for foliar diseases are present, foliar fungicides will help increase yields,” says Jim Trybom, Pioneer agronomy research scientist. “Cool and wet conditions in July can create an environment well-suited for foliar diseases in soybeans. If mid-season weather proves to be cool and wet, foliar fungicides may be a good option to protect yield.”

Historically, foliar fungicides for soybeans were used more in the South, but in the last few years, they’ve become more popular in areas of the Corn Belt. This is due to the improved chemistry of foliar fungicides and the increased interest in managing soybeans for higher yields.

“The older chemistry of foliar fungicides for soybeans only included contact fungicides,” Trybom says. “Now, the chemistry has improved, and there are systemic fungicides available.”

Contact fungicides remain on the surface of the plant, so if it rains soon after applying, it can be washed off. Systemic fungicides are absorbed by the leaves and move within the treated plant.

“Systemic fungicides allow growers to properly manage soybeans now more than ever before,” Trybom notes. “Soybeans that have been sprayed retain their leaves for a longer period of time, allowing them to fill longer.” This allows the beans to increase in size and weight, and smaller beans to fill.

Trybom offers several tips for using foliar fungicides:

• Rate. One application of foliar fungicide during the R3 to R4 stages is best.

• Response. It’s important to keep in mind that foliar fungicides on soybeans are more likely to create a positive yield response where foliar diseases are present.

• Timing. Keep cool, wet environmental conditions in mind when deciding whether or not to apply.

• Scouting. Scouting is key in deciding whether or not to use foliar fungicides. Make sure you know which diseases are present or have been present in the field.

• Label. Be sure to read the label of the foliar fungicide for safety precautions and application rates.

Leave a Reply

2 comments on “How To Use Foliar Fungicides

  1. What about water volume, nozzle types and spray pressures? What about adjuvants? I think these issues are commonly forgotten but add to more bushels than some of your tips above.

Fungicides Stories

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
Frog eye leaf spot on soybean
FungicidesMake The Case For Fungicides In 2014
February 3, 2014
New products are looking good, but will growers bite with lower crop prices? Read More
FungicidesMANA Introduces Custodia Premix Fungicide For Row Crops
January 14, 2014
New fungicide for corn, soybeans, and wheat contains the two most complementary systemic active ingredients available today in an optimized ratio to deliver both preventive and curative disease control. Read More

Trending Articles

EquipmentSummer Show Preview 2014: Superior Sprayers Take The Field
July 3, 2014
In this final installment of our coverage of the major categories of Big IRON that retailers can expect to test-drive at this summer’s events, here is a look at 19 sprayers. Read More
Scouting a soybean patch at Green Valley Ag.
EmployeesCropLife Compensation Survey: Battling Talent Drain
July 2, 2014
Retailers too often lose employees to companies outside of agriculture, while recruiting efforts are most often limited to competitors and other ag-focused organizations. Read More
HerbicidesDow AgroSciences Introduces SureStart II Herbicide
June 16, 2014
The enhanced formulation has improved viscosity and increased stability under heat and controls more than 60 high-anxiety grasses and broadleaf weeds found in corn fields. Read More
HerbicidesBASF Investing $270 Million To Expand U.S. Herbicide Production
June 11, 2014
BASF has invested more than $270 million to expand herbicide production capacities in the U.S., including more than 20 new products to be launched over next two years. Read More
EquipmentGPS: 25 Years And Still Growing
June 2, 2014
The evolution of global positioning systems applications in agriculture remains ongoing as the technology hits a notable milestone. Read More
CropLife 10013 Key Acquisitions Pinnacle Has Made In The First Half Of 2014
May 29, 2014
The only thing that has reached a more frenzied pace than #plant14 might be the multiple acquisitions that Pinnacle Agriculture Holdings has made in the first half of the year. Read More

Latest News

FungicidesEPA OKs Two Willowood Fungicides
July 21, 2014
The EPA has approved Willowood Azoxy 2SC and Willowood AzoxyProp Xtra. two widely used broad spectrum, preventative fungicides with systemic and curative properties. Read More
Precision AgFarmers Learning Fast As UAVs Take Off
July 17, 2014
Farmers and others interested in how UAVs can be used in agricultural applications were able to learn more about the technology during the recent Precision Aerial Ag Show. Read More
CropLife 100Bobby Knight, Richard Petty To Highlight Ag PhD Field D…
July 17, 2014
Attendees at the July 24 Ag PhD Field Day at Hefty Farms will learn about the latest agricultural technologies, and get a chance to meet legendary sports figures Bobby Knight and Richard Petty. Read More
WebinarsUpcoming Webinars
July 17, 2014
Register for one of our upcoming Webinars or access our archive of past Webinars to view recordings of presentations that may be of interest to you. Read More
A finished Willmar 16-ton side-shooting tender.
TendersNew Production Facility Helps Willmar
July 17, 2014
In 1963, a group of businessmen started Willmar. Today, a half-century later, the company is one of the ag industry’s longest-running brands. Read More
FertilizerCF Industries Sells Carbon Credits To Chevrolet, Donate…
July 17, 2014
CF Industries has completed the sale of a large block of carbon reduction credits to Chevrolet, and will donate the net proceeds of $600,000 to the National FFA Foundation. Read More
CropLife 100Grainland Cooperative, Minier Cooperative Grain To Merg…
July 17, 2014
The shareholders of Grainland Cooperative and Minier Cooperative Grain Co. approved a merger of company operations effective August 1, 2014. Read More
ManagementStudy: Drought Costing California Billions
July 17, 2014
A new study has found the drought has cost the state $2.2 billion, primarily in lost farm revenue and wages. Read More
FertilizerCF Industries Resumes Production At Oklahoma Nitrogen C…
July 17, 2014
The company had shut down production at the Woodward, OK, facility in April to address an issue in one of the site’s boilers. Read More
CropLife 100Wilbur-Ellis To Relocate Agribusiness Division To Denve…
July 16, 2014
The move Eastward will allow Wilbur-Ellis’ Agribusiness Division to be more accessible to relevant geographies and is expected to enhance communication and collaboration among the division’s nearly 3,000 employees. Read More
Soybean field
FungicidesValent Launches New Seed Protection Fungicide For Soybe…
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
Crop InputsSyngenta Drive To Thrive 10 Finalists Announced
July 15, 2014
Finalists are chosen based on the quality of their essays and photos depicting what makes them thrive. Read More
FertilizerHow To Minimize Phosphorus Losses In Runoff
July 15, 2014
Phosphorus losses from agricultural fields can be divided into three categories: flash losses of soluble phosphorus, slow leak losses and erosion events. Here's how to minimize losses in each instance. Read More
ManagementCalifornia Drought Threatens To Dry Up Farm Wells
July 15, 2014
Farmers hit hardest by California's drought could begin to see wells run dry next year, according to a new study by The Center for Watershed Sciences at the University of California, Davis. Read More
Precision AgPoll: Do you plan to attend this year’s InfoAg Co…
July 14, 2014
This year’s InfoAg Conference is just two weeks away. The premier event in precision agriculture takes place July 29-31 at Read More
LegislationFarm Bill Implementation Continues
July 14, 2014
The bill provides $28 billion over the next five years for conservation on private lands while streamlining several old programs and creating new ones like the Regional Conservation Partnership Program. Read More
MicronutrientsH.J. Baker Continues Expansion Of Atmore Facility
July 14, 2014
The company has improved its molten sulphur unloading system to help meet increased sulphur demand at Tiger-Sul’s Atmore, AL, facility. Read More
Stewardship4R Certification Training Kicks Off As Lake Erie Algae …
July 14, 2014
As scientists prepare for the coming season of potential algae blooms on Lake Erie, nutrient service providers have been signing up for the 4R Nutrient Stewardship Certification program at a steady pace. Read More