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2021 Summary of Foliar Fungicide Applications on Corn in Iowa

March 4, 2022
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Corn foliar fungicide trials done at six locations in Iowa in 2021: ISU Northwest Research and Demonstration Farm (NWRF), Sutherland; Northeast Research and Demonstration Farm (NERF), Nashua; Northern Research and Demonstration Farm (NRF), Kanawha; Southwest Research and Demonstration Farm (SWRF), Lewis; Southeast Research and Demonstration Farm (SERF), Crawfordsville; and the Ag Engineering and Agronomy Farm (AEA) near Boone.

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2020 Summary of Foliar Fungicide Applications on Corn in Iowa

February 17, 2021
table showing effects of foliar fungicide applications

This article summarizes 2020 corn foliar fungicide trials that were done at six locations in Iowa: ISU Northwest Research and Demonstration Farm (NWRF), Sutherland; Northeast Research and Demonstration Farm (NERF), Nashua; Northern Research and Demonstration Farm (NRF), Kanawha; Southwest Research and Demonstration Farm (SWRF), Lewis; Southeast Research and Demonstration Farm (SERF), Crawfordsville; and the Ag Engineering and Agronomy Farm (AEA) near Boone.

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Statewide soybean foliar fungicide evaluation in 2020

December 2, 2020
table of soybean fungicide yield results

With support from the soybean checkoff through the United Soybean Board, Iowa State University researchers evaluated foliar fungicides on soybean in 2020. Because dry weather affected all seven field locations, this year was really an evaluation of fungicides largely in the absence of disease. Seventeen fungicides were tested at the R3 (beginning pod) growth stage, at the recommended label rate.

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Fungicide Use on Hail Damaged Corn and Soybean

July 14, 2020 8:38 AM
Blog Post

Hailstones damaged corn and soybean in multiple locations across Iowa on July 11, 2020.  Fungicide use after hail injury is sometimes suggested as a way to benefit damaged plants. In order to help determine if fungicide use after hail is beneficial, Iowa State University undertook multiple years of research.

To summarize this research on reproductive stage crops:

Summary of Foliar Fungicide Applications on Gray Leaf Spot and Yield of Corn in Iowa in 2019

January 27, 2020

This article summarizes our 2019 corn foliar fungicide trials that were done at six locations in Iowa: ISU Northwest Research and Demonstration Farm (NWRF), Sutherland; Northeast Research and Demonstration Farm (NERF), Nashua; Northern Research and Demonstration Farm (NRF), Kanawha; Southwest Research and Demonstration Farm (SWRF), Lewis; Southeast Research and Demonstration Farm (SERF), Crawfordsville; and the Ag Engineering and Agronomy Farm (AEA) near Boone.

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2015 Evaluation of Foliar Fungicides on Corn at Four Iowa Locations

June 1, 2016
Evaluation of Foliar Fungicides at several sites

Every year we evaluate commercial fungicides on corn applied at V5 alone, VT-R1 alone, or both growth stages for disease control and effect on yield. The trial was done in collaboration with the farm managers at four Iowa State University (ISU) Research and Demonstration Farms (Table 1). The trials are laid out in a randomized complete block design with four to six replicates.  Plot sizes are 10 foot (4 rows) wide and 30-100 foot long. Hybrids varied by location.

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Hail and Fungicides Update 2013

July 17, 2013
Hail machine "hailing" soybean plants

By Adam Sisson, Integrated Pest Management, and Daren Mueller, Department of Plant Pathology and Microbiology


When crop hail damage occurred in the past, farmers could either replant or see if crops would grow out of the damage, depending on extent and timing of hail. However, there have been significant changes in production practices for corn and soybean, especially concerning fungicide use and the labeling of fungicides for the mitigation of plant stress such as hail injury.


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Questions and Answers on Soybean Fungicide Applications

July 9, 2008
Image of soybean leaves infected with brown spot

XB Yang, Department of Plant Pathology

 As the difficult planting season passes, we continue to receive not so positive reports on soybean and corn with the development of foliar diseases due to weather conditions.  In Iowa there have been many observations and questions on soybean foliar diseases, especially brown spots, by field crop specialists and producers. Producers have questions about how and when to use fungicides to control foliar diseases. This article addresses some of those questions.

 

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